I have 32gb of ram, that might influence that number so. I was a bit surprised to see that CPU usage was so low.
Hehe no no, the size doesn't matter at all. Only the speed! And not for all games.
AC only uses 2 big CPU threads and a little one (and a lot of very very small ones).
ACC uses about 1 CPU thread more.
If you would look into one single CPU cycle, you would see one CPU thread at 100% load, another one at 80-99% and the little one causing a third core to be at 30-50%.
And then you would see a little bit of load on all other cores from Windows etc.
But you have 4.800.000.000 CPU cycles per second and Windows moves the load dynamically across all cores. So it looks like your CPU would have a lot of headroom with no core being at high loads.
But as I said, if you'd zoom into a single CPU cycle, you would see 1-2 cores completely maxed out.
Since we don't have a tool that has a refresh cycle of 1/4.800.000.000 second, we can't see a CPU limit.
With graphics cards it's luckily a lot easier. If they are the bottleneck, the load is definitely higher than 95%.
The 95% are a bit weird. Some games can't fully utilize the latest GPUs so the maximum possible load varies a little.
A good way to measure the headrooms is by measuring the CPU and GPU frametimes.
Oculus tray tool can show you the graphs in your headset.
Example:
You want 90 fps. That's 1s/90 per frame = 11.11 ms
You always have one frame buffered so the CPU and the GPU could theoretically take 11.10 ms and the image would be fluid.
Now if you measure the CPU and GPU frametimes and it looks like this:
CPU = 10 ms
GPU = 8 ms
If you get some fps drops, you'll know it's more likely that the CPU is the issue.
AC for example is 7-10 ms on the CPU, while my 3080 at 3440x1440 only takes 2-4 ms.
I hope that clears up a few things
In the end it's pretty simple: If your graphics card isn't at 90-100%, it's something else, most likely just the CPU performance.
CPU Performance includes ram speed. But ram is only a very little part of the cpu frametime part.
It can also be:
- fps limiter
- vsync
- VR headset thinking you won't have enough headroom and going into reprojection