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Hi all,
I just bought a note 4 sd 805 (the UK version). I expected this to be a very powerful phone, but instead I am kind of disappointed .
After playing Asphalt 8 for just 15min, the game starts to lag considerably and suffer from some serious frame rate drop.
The phone itself heats up a bit, but not a lot.
I also noticed that, if I run antutu for say 5 times in a row (with no pause), the score will drop from about 48000 to about 38000.
I still keep my note 3, which is rock solid and did not have the above behaviour (i.e. no heat at all, I can play asphalt 8 for hours with perfect quality and consistent antutu scores of about 43000).
Also my pvs is 13, which seems to be quite a good one (as per this thread http://forum.xda-developers.com/note-4/general/info-check-share-cpu-binning-t2950180)
Do you guys think I have a faulty note 4? Should I return it?
Thanks
I dont think that you has a faulty note. Same here with s5 and sd 801 runing gta vc. In about 20 mins of gaming fps drops horrible
Enviado desde mi SM-N910C mediante Tapatalk
Thanks,
but if the latest generation of phones cannot handle tasks (i.e. games) which the previous generation (note 3 in my case) handled with easy,
doesn't that mean the the phone is not fit for purpose?
In my case I paid £580 and expected to see some improvements. The only true improvement (compare with note 3) is the camera.
The game performance is awful.
The display seems to be brighter (on auto and against direct sun light), but if I actually want to use it like that, it starts heating up and throttle after 15min.
In normal tasks (browsing and light apps) note 3 and note 4 perform on par, with sometimes note 3 being faster.
I also ran the stress test app, and it seems that the note 4 does not stay on 2.7 at all. it starts with 2.4 then quickly goes to 2.2 and 1.9 and after a few minutes it goes down to 1.1 and it stays there. My note 3 on the other hand starts with 2.27 and stays there for few minutes then goes down to 1.9 and 1.7 and then it stays between 1.5 and 1.7.
So, under heavy load snapdragon 805 perform worst than 800. Please note that the SD in my unit has the perfect binning of pvs13. The SD 800 in my note 3 is pvs 2 and it is still way more stable.
I just want to know if you guys have similar experience with the phone?
mitko76 said:
Thanks,
but if the latest generation of phones cannot handle tasks (i.e. games) which the previous generation (note 3 in my case) handled with easy,
doesn't that mean the the phone is not fit for purpose?
In my case I paid £580 and expected to see some improvements. The only true improvement (compare with note 3) is the camera.
The game performance is awful.
The display seems to be brighter (on auto and against direct sun light), but if I actually want to use it like that, it starts heating up and throttle after 15min.
In normal tasks (browsing and light apps) note 3 and note 4 perform on par, with sometimes note 3 being faster.
I also ran the stress test app, and it seems that the note 4 does not stay on 2.7 at all. it starts with 2.4 then quickly goes to 2.2 and 1.9 and after a few minutes it goes down to 1.1 and it stays there. My note 3 on the other hand starts with 2.27 and stays there for few minutes then goes down to 1.9 and 1.7 and then it stays between 1.5 and 1.7.
So, under heavy load snapdragon 805 perform worst than 800. Please note that the SD in my unit has the perfect binning of pvs13. The SD 800 in my note 3 is pvs 2 and it is still way more stable.
I just want to know if you guys have similar experience with the phone?
Click to expand...
Click to collapse
You right bro.
You can manage your thermals with custom kernel. Its a know problem, even in the lg g3 forum theres a mod to raise the values of throttle.
Enviado desde mi SM-N910C mediante Tapatalk
mitko76 said:
Hi all,
I just bought a note 4 sd 805 (the UK version). I expected this to be a very powerful phone, but instead I am kind of disappointed .
After p.....
Click to expand...
Click to collapse
Disable DVFS (just for the laggy games if your phone doesn't freeze and restart) and asphalt will be perfect. You can also run games in 1080 which helps and be grateful as there are kernels supported by your phone's version that you can mess with the thermal throttle and gpu clocks. Just don't let it get too hot
I agree with you, there should be no tweaks needed to run any game, but that's unfortunately not the case, but with some work you can get it to perfect performance! Good luck!
How's the gameplay on the Exynos variant? I never had gaming issues on the Note 2
@arjun90
exynos is way better at gaming
its not laggy in asphalt 8 even after 15 minutes
On sd805 asphalt 8 is just unplayable.. it does not work well from the first minute (I mean as good as my sd800 note 3)
and after about 15min it becomes even worst.
and that is with sd805 binned 13.. My first note 4 (which I returned) was getting hot just from web browsing. I am sure the cpu was with low quality bin.
Samsung should get rid of this low quality cpus.. We pay some serious money and at the end it is just a lottery...
I am also seriously disappointed with the awful deteriorating game performance. For a phone of this price and calibre I was expecting so much more. I hope it is software related and can be fixed, but I don't want to melt my phone!
I have Canadian SM-N910W8 with SD805 and 420 Adreno just tried asphalt 8 its running fast at high setting even with power saving on. Also scored Atutu 47923.
Anyone tried Wolf among us? Game won't start after title screen?
Tiberx said:
I have Canadian SM-N910W8 with SD805 and 420 Adreno just tried asphalt 8 its running fast at high setting even with power saving on. Also scored Atutu 47923.
Anyone tried Wolf among us? Game won't start after title screen?
Click to expand...
Click to collapse
well I don't know what to say mate I have the same cpu and gpu, Antutu for me is even above 48000 regularly about 48700
still asphalt 8 is just pretty much unplayable.. Some other games however are ok. Hope it is a software issue and sammy/app developer(gameloft) fix it.
I am non rooted and fully stock..
Have you try to greenify everything then run the game? I think it probably software.
I'm rooted but using my original stock image as base with extras - fixed everything working. Took me a while but good trends here before had lots of issues.
Yes i agree with that games like asphalt should play smooth without installing custom rom.. It is really awful.. But now after flashing kernel and flashed rom it runs smoooottthh!..
it is the first android phone I am reluctant to root (at least for now). Lollipop is coming very soon and I prefer to see what it will bring to my note.
If if works for you guys (after rooting and possibly applying custom kernel and some modifications) it is sammy fault and not the game developer. It is really frustrating. Hope sammy fix this mess soon.
Yet again blaming the chip on what is clearly a not optimized game for the 805. Software is the problem. Ya know if the game isn't optimized for that chip it will run like ****, if they update for this phone and it still runs ****ty than they did a bad job.
Hi ive running the 1st version of asphalt 8 on my phone for about 20 min without any lags.Might be the games are not optimised yet
Edit:Just Noticed that the graphic settings to medium & high are not available which is very strange
Sent from my SM-N910G using XDA Premium 4 mobile app
RISHI RAJ said:
Hi ive running the 1st version of asphalt 8 on my phone for about 20 min without any lags.Might be the games are not optimised yet
Edit:Just Noticed that the graphic settings to medium & high are not available which is very strange
Sent from my SM-N910G using XDA Premium 4 mobile app
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I have noticed that any game with graphic options become unplayable after setting anything higher them low. ie. GTA SA.
airwa1kin7 said:
I have noticed that any game with graphic options become unplayable after setting anything higher them low. ie. GTA SA.
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Click to collapse
True,ive also set resolution to 70 with everything else to minimum or off in GTA SA.My Note 3 is way better gaming wise
Sent from my SM-N910G using XDA Premium 4 mobile app
RISHI RAJ said:
Hi ive running the 1st version of asphalt 8 on my phone for about 20 min without any lags.Might be the games are not optimised yet
Edit:Just Noticed that the graphic settings to medium & high are not available which is very strange
Sent from my SM-N910G using XDA Premium 4 mobile app
Click to expand...
Click to collapse
bizarre.. for me the medium & high settings are available.. it just the game itself kind of unplayable.
the fact that some users report that the issue is fixable with root and custom kernel gives some hope.
Hey all.
So I would expect a 500 quid phone to be able to play the latest and greatest mobile games without stutter. Unfortunately this is not the case, with my most recent example being Real Racing 3. This game has terrible stutter and a frame rate of maybe 20fps if i am lucky.
I suspect this is partly to do with screen resolution, however is there a way to actually make the Galaxy Note 4 a good gaming device? I have root.
@captainbirdseye86 Lower the screen resolution with nomone apk from google play there is a thread about it here http://forum.xda-developers.com/note-4/help/downscale-resolution-to-1080p-to-t2886177 and the apk link is here https://play.google.com/store/apps/...=nomone&pcampaignid=APPU_6l3OVKeSLZPaav6hgdAK also try to disable dvfs with xposed framework install a custom kernel (more performance depending on your settings but also more battery drain) and try to have a stock ROM as much as possible yeah all those customized Roms are way better but nothing is perfect all those mods costs on the performance also greenify your apps and system apps as much as you can...just some tips
sephkateno said:
@captainbirdseye86 Lower the screen resolution with nomone apk from google play there is a thread about it here http://forum.xda-developers.com/note-4/help/downscale-resolution-to-1080p-to-t2886177 and the apk link is here https://play.google.com/store/apps/...=nomone&pcampaignid=APPU_6l3OVKeSLZPaav6hgdAK also try to disable dvfs with xposed framework install a custom kernel (more performance depending on your settings but also more battery drain) and try to have a stock ROM as much as possible yeah all those customized Roms are way better but nothing is perfect all those mods costs on the performance also greenify your apps and system apps as much as you can...just some tips
Click to expand...
Click to collapse
Good work man. I'll just add closing background apps and messing with the minimum/maximum GPU/CPU clock.
captainbirdseye86 said:
Hey all.
So I would expect a 500 quid phone to be able to play the latest and greatest mobile games without stutter. Unfortunately this is not the case, with my most recent example being Real Racing 3. This game has terrible stutter and a frame rate of maybe 20fps if i am lucky.
I suspect this is partly to do with screen resolution, however is there a way to actually make the Galaxy Note 4 a good gaming device? I have root.
Click to expand...
Click to collapse
it is very disappointing indeed .. I rarely play games, but Asphalt 8 is my favourite and it is just unplayable on my sd805 note 4.
I have paid £587 for the device, and apparently have to root it and spend hours if not days tweaking it to be able to play some games.. Not a good job from Samsung in this department ...
mitko76 said:
it is very disappointing indeed .. I rarely play games, but Asphalt 8 is my favourite and it is just unplayable on my sd805 note 4.
I have paid £587 for the device, and apparently have to root it and spend hours if not days tweaking it to be able to play some games.. Not a good job from Samsung in this department ...
Click to expand...
Click to collapse
The answer to all your performance problems is a clean bug free pure google ROM I don't know if you can install one on the SD since I have the octa one but a ROM without all those s crap and bloatware equals to more performance if the ROM of course is properly cooked
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gabrielgon said:
Good work man. I'll just add closing background apps and messing with the minimum/maximum GPU/CPU clock.
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Click to collapse
I heard a dev talk that there isn't much to be gained by ocing the GPU and as far as CPU oc goes the more you push it the less time it will stay on that frequency because overheating could be 5 minutes away at full throttle oh and if you oc the GPU keep in mind that some voltage tuning might be necessary on the octa one I had stuttering on ultimate and persues kernels it varies from device to device...
PS hit that thanks button
The answer to the problems... its partly the chip runs so hot.. wait for lollipop to see what happens 1st
sephkateno said:
The answer to all your performance problems is a clean bug free pure google ROM I don't know if you can install one on the SD since I have the octa one but a ROM without all those s crap and bloatware equals to more performance if the ROM of course is properly cooked
---------- Post added at 02:54 PM ---------- Previous post was at 02:49 PM ----------
I heard a dev talk that there isn't much to be gained by ocing the GPU and as far as CPU oc goes the more you push it the less time it will stay on that frequency because overheating could be 5 minutes away at full throttle oh and if you oc the GPU keep in mind that some voltage tuning might be necessary on the octa one I had stuttering on ultimate and persues kernels it varies from device to device...
PS hit that thanks button
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Click to collapse
If you encounter problems with GPU OC, just increase the voltage a little bit. Don't see a problem there. When I talk about GPU/CPU management I mean mainly to increase the minimum GPU clock as some games don't demand enough of our device (haven't tested). Even with DVFS disabled I get a lot of 20ish fps playing spider man unlimited and the phone isn't even warm. It means the game is not requesting enough power. This is something I want to test, to force a high GPU clock with DVFS disabled and see what happens, but there's no kernel able to do that on exynos yet. Have you tested this? Do you know a way to control GPU clock on exynos or do you think they'll ever implement it?
mitko76 said:
it is very disappointing indeed .. I rarely play games, but Asphalt 8 is my favourite and it is just unplayable on my sd805 note 4.
I have paid £587 for the device, and apparently have to root it and spend hours if not days tweaking it to be able to play some games.. Not a good job from Samsung in this department ...
Click to expand...
Click to collapse
It is very unfortunate to say that every smatphone in the world is like this. I'm a fan of asphalt 8 myself so I can say about it. I was playing the game on my girlfriend's iphone 6 which has the best GPU on a smartphone in my opinion + 750p resolution = insane graphics performance, right?? Sure! IF you don't throttle like crazy. Even with this insane combination the game hits 20ish fps here and there while the phone barely gets warm.
If you want to play the game with high fps without rooting just lower the graphics in options -> display. I was playing on high after all the mods I've done but it gets so hot and the battery runs out SO FAST that now I'm just playing on low/very low. The quality difference is minimum and you can play for a looong time.
If you need help to tweak your device (after root) for playing you can PM me. I'm a high fps addicted.
Hit the thanks button if I helped.
i am not sure why the games you are playing got low fps, i have played many games including BIA3, NFS MW , Dead Trigger 2 , BatMan, MC3 , Asphalt 8 etc
I so far felt no stuttering or any slowness even no Hot device over my Exynos
I am on stock No Root
fursuf said:
i am not sure why the games you are playing got low fps, i have played many games including BIA3, NFS MW , Dead Trigger 2 , BatMan, MC3 , Asphalt 8 etc
I so far felt no stuttering or any slowness even no Hot device over my Exynos
I am on stock No Root
Click to expand...
Click to collapse
You live in a cold place? Don't play for long periods? Many games run perfect on complete stock, sure! It isn't that bad.
@gabrielgon thank you for your time explaining this so yeah I get stuttering on God of fire let's say I will have to increase the gpu voltages table by at least 50 to make the problem ALMOST disappear now about low fps yeah also on galaxy on fire when a ship explodes I get some fps drop it is quite hilarious really thinking that this monster reaches out it's limits after some brainstorming though I figured I should reduce the resolution to 1080p or even 720 and woala no fps drops although the stuttering is still there so I guess I will have to increase the gpu frequency although I don't know if there is a way to do this...I will try to search a little
EDIT: OK so I used two apps that let you control the gpu frequency but it won't work on one app the function was greased out and on the other I kept pushing the button but it never took me to the menu to change the gpu frequency my guess is since the kernel doesn't support neither will the apps I don't think we will find any out there to do it if the kernel doesn't support it...
gabrielgon said:
You live in a cold place? Don't play for long periods? Many games run perfect on complete stock, sure! It isn't that bad.
Click to expand...
Click to collapse
Yes. I never played more then 40mins and the normal temp around is about 30C
fursuf said:
Yes. I never played more then 40mins and the normal temp around is about 30C
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Click to collapse
I wish the rest of us gamers were like you
sephkateno said:
@gabrielgon thank you for your time explaining this so yeah I get stuttering on God of fire let's say I will have to increase the gpu voltages table by at least 50 to make the problem ALMOST disappear now about low fps yeah also on galaxy on fire when a ship explodes I get some fps drop it is quite hilarious really thinking that this monster reaches out it's limits after some brainstorming though I figured I should reduce the resolution to 1080p or even 720 and woala no fps drops although the stuttering is still there so I guess I will have to increase the gpu frequency although I don't know if there is a way to do this...I will try to search a little
EDIT: OK so I used two apps that let you control the gpu frequency but it won't work on one app the function was greased out and on the other I kept pushing the button but it never took me to the menu to change the gpu frequency my guess is since the kernel doesn't support neither will the apps I don't think we will find any out there to do it if the kernel doesn't support it...
Click to expand...
Click to collapse
Ok, some stuff I can help you with:
Increasing the voltage doesn't increase performance, this only makes your phone use more energy. People usually undervolt their phones to get better battery life but when it gets too undervolted the phone gets unstable. That's why when you overclock you might need to increase the voltage, to keep it stable.
You won't be able to mess with GPU frequency unless your kernel support it. Maybe if you are a snapdragon user (I'm not sure), but on exynos you won't.
Downscaling resolution helps. There's a thread about it here. Good luck!
---------- Post added at 08:58 AM ---------- Previous post was at 08:54 AM ----------
fursuf said:
Yes. I never played more then 40mins and the normal temp around is about 30C
Click to expand...
Click to collapse
That's probably the battery temperature, but either way that's pretty dam good!! After 10-15 minutes you'll probably reach the heat peak already so that's enough for testing. Good to know you're having a good experience!
gabrielgon said:
It is very unfortunate to say that every smatphone in the world is like this. I'm a fan of asphalt 8 myself so I can say about it. I was playing the game on my girlfriend's iphone 6 which has the best GPU on a smartphone in my opinion + 750p resolution = insane graphics performance, right?? Sure! IF you don't throttle like crazy. Even with this insane combination the game hits 20ish fps here and there while the phone barely gets warm.
If you want to play the game with high fps without rooting just lower the graphics in options -> display. I was playing on high after all the mods I've done but it gets so hot and the battery runs out SO FAST that now I'm just playing on low/very low. The quality difference is minimum and you can play for a looong time.
If you need help to tweak your device (after root) for playing you can PM me. I'm a high fps addicted.
Hit the thanks button if I helped.
Click to expand...
Click to collapse
Thank you gabrielgon, note 4 is the first galaxy phone I am reluctant to root. I just don't have the time I had years ago.
I kind of disagree with you that all phones experience these issues. My previous note 1, 2 and 3 had no such problems.
That is just new to me. With all my previous note phones, I could just download any game (most likely asphalt ) and play as long as I want.
It is annoying that my note 3 (which I still keep) is capable of playing Asphalt 8 on max settings for hours with absolutely no issues and yet my shiny new note 4 just struggling with that.
I think samsung just should not have adopted the 2k display technology so early. Obviously the hardware is not there yet.
I personally do no see any difference pixel wise from the display in my note 3.
Yes, the note 4 has brighter and more accurate colour wise display and that is all they should have change.
captainbirdseye86 said:
Hey all.
So I would expect a 500 quid phone to be able to play the latest and greatest mobile games without stutter. Unfortunately this is not the case, with my most recent example being Real Racing 3. This game has terrible stutter and a frame rate of maybe 20fps if i am lucky.
I suspect this is partly to do with screen resolution, however is there a way to actually make the Galaxy Note 4 a good gaming device? I have root.
Click to expand...
Click to collapse
Mate my note 4 hasn't stuttered once during any game. At all so not sure why yours is?
I think you should try Stock and factory reset.
dladz said:
Mate my note 4 hasn't stuttered once during any game. At all so not sure why yours is?
Click to expand...
Click to collapse
hi man, are you with sd805? if so, try asphalt 8 (on max settings) for 20min.
fursuf said:
I think you should try Stock and factory reset.
Click to expand...
Click to collapse
stock reset is the first thing I always do. it did not change anything.
mitko76 said:
hi man, are you with sd805? if so, try asphalt 8 (on max settings) for 20min.
stock reset is the first thing I always do. it did not change anything.
Click to expand...
Click to collapse
Using the 910F, doesn't stutter on emulation, heavy 3D games ?!? Just doesn't stutter, sorry man i'm not seeing it.
But yea the 805 yea, i'm not on stock but even when i was it seemed to be fine.
dladz said:
Using the 910F, doesn't stutter on emulation, heavy 3D games ?!? Just doesn't stutter, sorry man i'm not seeing it.
But yea the 805 yea, i'm not on stock but even when i was it seemed to be fine.
Click to expand...
Click to collapse
that is cool man. I played with 3 note 4 (returned the first 2 because of defective displays and overheating) and they all had this issue.
It is not that I dont believe you, but I have to see it to believe it
My experience on the Note 4 is virtually the same as my experience on the Note 2, a device which is over two years old!
I do prefer Exynos, but I purchased the Snapdragon because it is the most supported SoC on the market, for now.
I'll make sure my next device sports an Exynos, I miss my Wolfson and Noticeable Performance Boosts, overall, going from one Exynos generation to the other.
Greetings.
I'm thinking of buying a new phone and it's either LG G2 or I9506 (It's S4 with 4G and snapdragon 800).
And from various benchmarks, futuremark's slingshot as an example, it beats even S5 and any 800 snapdragon device.
Is it really that fast in real life performance? I know that Samsung is cheating on bechmarks by overclocking CPU/GPU while benchmark is running.
So how does the I9506 perform in real life? How does it handle games?
I watched videos of LG G2 running games with FPS meter on and Asphalt 8 dropped below 30 constantly at max settings.
This is the video: https://youtu.be/2IOvC5NUng4?t=4m38s
It's been 1 year since the video so the game might have been optimized for quad cores since Gameloft is known to port games to android from iOS, so that means they don't use more than 2 cores. This was also present with GTA games.
Could anyone install an FPS meter and do an Asphalt 8 benchmark on their phone and compare if it runs better?
I'd be really grateful since this is going to be a huge purchase for me.
Artasdmc said:
Greetings.
I'm thinking of buying a new phone and it's either LG G2 or I9506 (It's S4 with 4G and snapdragon 800).
And from various benchmarks, futuremark's slingshot as an example, it beats even S5 and any 800 snapdragon device.
Is it really that fast in real life performance? I know that Samsung is cheating on bechmarks by overclocking CPU/GPU while benchmark is running.
So how does the I9506 perform in real life? How does it handle games?
I watched videos of LG G2 running games with FPS meter on and Asphalt 8 dropped below 30 constantly at max settings.
This is the video: https://youtu.be/2IOvC5NUng4?t=4m38s
It's been 1 year since the video so the game might have been optimized for quad cores since Gameloft is known to port games to android from iOS, so that means they don't use more than 2 cores. This was also present with GTA games.
Could anyone install an FPS meter and do an Asphalt 8 benchmark on their phone and compare if it runs better?
I'd be really grateful since this is going to be a huge purchase for me.
Click to expand...
Click to collapse
Somebody posted a similar question and posted benchmark examples that were done on android 4.2.
I played Asphalt 8 on my S4 GT-I9505. Seemed to run pretty smooth. And that was when underclocked to 1.2 GHz.
Samsung cheated on the GT-I9500 version. Benchmark apps used all cores instead of just 4. An app can;'t overclock without root permissions.
I'm considering getting a new phone and was really hoping the huge performance increase in CPU has helped PPSSPP. I have a SD 810 phone and it's basically unplayable because it throttles down. I specifically would like to know how midnight club 3 dub edition runs, daxter, gran turismo. I've searched the web for a good emulation review of S7 but can't find one.
I play a LOT of PPSSPP therefore i believe i can give u the answer you looking, but PPSSPP does NOT work on GS7 atm, there is a workaround though.
It will crash many times, but eventually it will work, it might take 10 tried 20 or even 2, as far as performance it's a disaster, all GS7 and sammy devices with 6.0.1 suffer from performance bug related to games, S7 too.
However if u rooted u can set governor to performance and unleash the full might of the phone, then it runs perfect(Tekken 6 in my case).
Oh wow okay just bad software then right now? Does tekken run full speed?
yes tekken ran on 60fps on note 5, but it much better on S7 though it lags from time to time, but that due some ppsspp updates, it supports vulkan so it might get better.
Another thing you might wanna try if u rooted, is disabling DVFS, that thing throttles the phone very fast, but if u disable it, ui performance will be bad.
I've been playing PUBG Mobile for a while now and wanted to ask you how you find the performance on our Samsung S8.
When I had Android Nougat it really sucked (a problem that shouldn't happen, because of the great potential of our phone). However, now that I have Android Oreo I can play normally and without problems, but I still find that I should run better because I have seen it installed in cell phones of lower capacity and have more fluidity.
Someone who plays it and knows some trick to get 100% potential out of our S8?.
Translated with www.DeepL.com/Translator
check what's running in the background that may cause hickup, look out for memory usage
I have an S8+ with the google wiz rom (It erased about 300 apps and has some optimizations) and I still feeling that my phone doesn't run the game as fluid as it should be
mine S8+ still has nugget. haven't received update yet. all the other apps and games run fine except PUBG, it freezes then restarts.
Mine s8 doesn't support hdr graphics and ultra frame rates in pubg
Hello
I have an s8 with custom pie ( hades rom ), max setting are hd and high fram rate, while rooting and removing all bloatware etc...
Just download gfx tools there is a paid and free version, i played it on smooth graphics 60 fps no lag at all, remember that internet speed plays a big role.
Hi, I know this is super late but what I've found about gaming on the s8 is that there is absolutely nothing that will affect the performance of the phone or your experience of the game more than thermal throttling. I tried for weeks to fix my lag problems with all kinds of kernel tweaks, network teaks, getting rid of background processes and trying to keep my ram free and was totally stumped until I realized just how much my cpu was being supressed by thermal throttling. Download GameBench to get an overlay of your in game frames per second (you should be able to get a constant 60 fps no problem until the throttling sets in) and get Simple System Monitor to monitor your thermal sensors and cpu frequencies. You should start to see an immediate correlation between your fps drops and your and clock speeds and temperatures. If your phone is rooted you can use Kernel Adiutor to set your cpu govoner to performance (it just locks your cpu at max clockspeed). This will make the throtting very easy to see in simple system monitor because you can see how your max clock speed is gradually stepped down as thermal engine overrides the govoner.
Now for the fix. If your S8 is a exynos you are a lucky b***ard and you can probably find a software solution for disabling thermal throttling like with a custom kernel or by editing a few system files. If your stuck with a locked bootloader like I am on the snapdragon s8 than the only solution is to actually keep your phone cool while gaming. I use ice packs wrapped in a paper towel. They only last about 30-40 mins so you may need several ice packs and keep them in rotation. Whatever cooling solution you use just make sure its not too extreme or too sudden as rapid changes in temperature are not great for electronics. That's why I use a paper towel as a bit of a buffer between the phone and the ice pack. Works great for me and I maintain 60 fps all game.