Re: [Old Report] Low GPU Usage and Framerate - WRC - DLSS no change
@Lawstorant wrote:Some more info on this CPU usage issue. I'm no unreal expert, but seems like the game is not culling previous map tiles correctly. It's loading faster than culling and the overlap causes issues. Here's a comparision between start of Brusne and end of Vitova (same plac, same settings, same car)(open images in new tab to see in full res):
Brusne start:
Vitova end:
The performance is wildly different on my 5800X3D. It's a loss of 70 FPS. Additional 4ms on the CPU side. Maybe the engine gets overwhelmed with the amount of objects? Terrain?
I don't believe it has anything to do with the CPU. What is happening here is affecting the GPU, that's it.
What you're seeing is exactly the same as in my video in the last post. The game clearly has a bug that is causing the GPU's clock speed to plummet just before the end of a stage.
You can tell it's a bug because if you pause the game when this "clock drop" occurs, all of a sudden GPU clocks speeds shoot back to normal and so does the FPS. Unpause and the clocks drop again. This is not the same as the GPU just being overloaded, that won't cause clock speeds to drop (that much). Again, you can see it in my video at the @7:05 minute mark, my clocks drop from 3000-3100 Mhz down to 1800-2100 Mhz. This is not normal behaviour for a game!!!
In your screenshots, you can see your clocks have dropped from 2087 Mhz to 1305 Mhz.
I'm no Unreal Engine expert either, but I wonder what kind of crazy code could be causing GPU core clock speeds to physically plummet like that. This is what @ChadillacDad the OP described in the first post, and that was happening with Nvidia - so this isn't a GPU specific or GPU driver issue. Seems to be happening with Ampere, Lovelace, RDNA 2 and RDNA 3 equally.
In both cases our CPUs are not even close to loaded, and CPU load doesn't increase when the FPS / GPU clock speed drop happens. In fact CPU usage drops, as you would expect if the GPU is suddenly running at half power and not able to push as much data.
I don't know how they have managed to do it, but it shouldn't be that hard to figure out - hey Codies, call the Epic Engine helpline if you need to!
Curiously.... in both our cases the GPU power draw is pretty much exactly cut in half.
I drop from a max power draw of ~550 W, to a max power draw of ~275 W
You drop from 222 W to 111 W.
HMMMMMMMM.
