Is this a CPU upgrade needed?

[Andy D]

Would like to know if I need to upgrade to a Ryzen 3K series CPU or to wait till something faster than 1080Ti is affordable..
Current system = 2700x, Gigabyte AX370 K7 mobo, Aorus 1080Ti, 16Gig 3200Mhz Flare X

99% use PC now for VR gaming. Below is MSI Afterburner trace of CPU/GPU usage. Need to know if changing to 3800x/3900x would sort out the drops to 45fps (ASW). Game is Dirt 2.0 (oculus runtime mode), High settings. Not changed SS at all...
https://ibb.co/YLLgdmQ

 

[Andy D]

That would be great, thanks.
Track was Lydden that I bought extra as only have season 1&2 DLC. Car was T16, just me doing a few laps Time Trial. Weather clear/sunny daytime

 

[Andy D]

Are you sure there is nothing else going on here, some sort of hitch due to paging, disk access, glitchy game etc?

Finally you have an 8 core CPU but only 4 cpus being tracked, can you get a screenshot with all 8 (or 16) cpus shown?

There wasn’t much going on on other cores so I left those out of the log to condense the image. I don’t have anything else running and RAM usage was only ~6gig from what I remember.
AFAIK, to keep 90fps all processing and rendering has to happen within a 11.11mS time period. As soon as the runtime decides it can’t keep up ASW kicks in and the GPU has half the rendering workload, which may show as the drop in % seen. Usually the biggest task during the ‘frametime’ is the rendering but here may be a lot of physics going on

 

[Andy D]

There’s not a vsync option for VR really. It’s either 90fps or it automatically drops to 45fps (interleaved). You can turn off ASW but you then get motion sickness issues. VR is demanding as you basically have 2 * 1080 x 1200 screens that need to run at 90Hz.

 

[Andy D]

Thanks loads for that stephenb, gonna order a 3900x now. I may be able to tweak my RAM up a bit from XMP profile using calculator otherwise I replace that too.

 

[Andy D]

My 3900x arrived from Overclockers today. I’d already updated to latest BIOS. Set optimised defaults, set PBO to enabled instead of Auto, and changed DRAM freq. to 3400 on top of XMP (no voltage changes). Loaded up Dirt 2.0 in VR and repeated same ‘test’.
Rock solid 90fps.

Happy with that