5700 XT not fully utilized

[David111cz]

I have a weird problem i never experienced. It seems my 5700 Xt doesn't want to run on 100%. But the problem is more complicated then that. Because i found out that the GPU usage is somehow tied to the resolution in a weird way.
Without vsync or freesync enabled whenever i change the resolution instead of framerate it actually changes the GPU usage.
For example i tested Kingdom come deliverence. Maxed out in 2560x1080 resolution on the certain spot i have 53 fps and GPU usage is very unstable from 60 to 85. When i lower the resolution to 640x480 the framerate stay exactly the same but the GPU usage falls to 40% or so...
In WoW i can test it the other way around because it has a resolution scale up to 200% of the resolution you use. So when i set the resolution to 2560x1080 again the GPU usage jumps around 60 to 85 unstably. But when i start increasing the  resolution scale up to 150% i can actualy see the GPU usage to increas and get more stable untill it reaches 99% and stays there. After i push it beyond the 150 i finaly start seing the fps to drop down and it works fine. So the card is capable to run stably under a full load. It just doesn't want to or refuses to...
Last example Metro exodus on Xbox (beta). This game usualy just crashes on start up when i try to use it with MSI afterburner. But when i manage to run it after a few tries it is the same. GPU usage jumps around 70 +/- 15. But whenever that game crashes the windows offers me to run it in ''safe mode'' next time and whatever that safe mode does it fixes the issue. GPU usage is stable 98-99%. Naturaly it has a big framerate boost compared to runing it out of that safe mode and it just works as it should.
If anyone actually knows what causes all of this i would be very grateful and thanks for reading through all of this wall of text..

CPU: Ryzen 3800x
GPU: Radeon 5700 XT
Ram:16gig 3200mhz
MB: ASUS B450-F

[xAcid9]

Seem like you got hit by CPU bottleneck? Can you run 3DMark Firestrike free to check if both of them is working properly? 

[David111cz]

1 minute ago, xAcid9 said:

Seem like you got hit by CPU bottleneck? Can you run 3DMark Firestrike free to check if both of them is working properly? 

Just ran it for you and everything seems to be working properly. The final score is 22376. Graphics score 26092, Physics 24057 and combined 10279. GPU doesn't have a problem to run fully in any benchmark. The issue seems to occure only in games. Also the CPU is nowhere near or running on 100% in any game i mentioned.
And as i said the GPU is capable to run on 100% stably. Either when i push that resolution scale or in that safe mode of Metro exodus.

 

[David111cz]

I just tested two other games PUBG and Resident Evil 2. Both on steam and both were running perfectly without any issues. The GPU utilization was 99% on the native resolution and everything was working fine.
So it seems like in some games the GPU refuses to run at full speed on native resolution and would rather lower it's usage then lower the framerate when the resolution is droped down. And slowly increase it's usage when the resolution is pushed beyond the native resolution untill it hit's the full load and it finaly starts doing what it should and start dropping framerate if pushed even further.
But it isn't every game apparently.

 

[xAcid9]

Some game is CPU limited. Kingdom Come at max setting can be pretty CPU intensive, try play with the settings.  

WoW like most MMORPG can be CPU limited (or netcode limited?) 

You can try some tweak for Ryzen that improve CPU limited gaming performance like per CCX overclock or disabling SMT. 

Also when a display driver crashed, it's better to reboot your pc or sometime your GPU will stuck on some power saving or safe mode state until reboot. 

[David111cz]

4 minutes ago, xAcid9 said:

Some game is CPU limited. Kingdom Come at max setting can be pretty CPU intensive, try play with the settings.  

WoW like most MMORPG can be CPU limited (or netcode limited?) 

You can try some tweak for Ryzen that improve CPU limited gaming performance like per CCX overclock or disabling SMT. 

Also when a display driver crashed, it's better to reboot your pc or sometime your GPU will stuck on some power saving or safe mode state until reboot. 

Thank you. I was just playing with kingdom come and i noticead that changing the draw distance does affect the GPU usage. Although the cpu runs comfortably at 30% in all cases.
But CPU bottleneck doesn't explain to me why the GPU starts running at 100% if i push the resolution up beyond the native resolution and it doesn't affect the framerate. If CPU would be bottlenecking the GPU then GPU shouldn't be capable running at 100% under any circumstance right?

[David111cz]

Ok so i disabled the SMT and it seems like there is an improvement. The CPU usage seemed to jump up a bit as well. I wouldn't say the issue is gone but GPU usage got better in those particular games. I'm surprised that 3800x could be a bottleneck for a GPU.
I never did it before so i need to ask. Would you advice leaving SMT disabled for good?

[melete]

CPU usage jumps up with SMT disabled because you’re disabling additional CPU threads and that means there are less CPU resources to utilize. 

 

That said, disabling SMT on Zen 2 CPUs can actually get them to boost higher in some circumstances so it’s not completely worthless to do that. GPU usage might tick up thanks to higher CPU core frequencies, I guess. 

[xAcid9]

12 hours ago, David111cz said:

But CPU bottleneck doesn't explain to me why the GPU starts running at 100% if i push the resolution up beyond the native resolution and it doesn't affect the framerate. If CPU would be bottlenecking the GPU then GPU shouldn't be capable running at 100% under any circumstance right?

By increasing the resolution or render scale you basically increasing the GPU workload that doesn't involve an increase in drawcalls or physics that affect CPU cycles.

11 hours ago, David111cz said:

Ok so i disabled the SMT and it seems like there is an improvement. The CPU usage seemed to jump up a bit as well. I wouldn't say the issue is gone but GPU usage got better in those particular games. I'm surprised that 3800x could be a bottleneck for a GPU.
I never did it before so i need to ask. Would you advice leaving SMT disabled for good?

You can try CCX overclocking, according to Der8auer some CCX overclock better than others.

CCX OC Tool: http://bit.ly/30zhbMz

[RAMSHOT]

Sounds like a RAM speed issue = latency, therefor looks like a CPU issue. What speed are you running your RAM at? Try and get Ram speed 3200MHZ out of the 2600+Ryzens and 3600mhz at least out of the 3600+Ryzens. At CL's of at least 16CL. I bet you'll see your GPU start to ramp up more.