I have a Threadripper 1950x and it renders faster than my 980ti (I will replace it with something eventually), which is actually a surprise. This is since the release of 2.83 and adaptive sampling; 2.82 the GPU just had the edge.
I’m seeing well over 25% advantage for CPU at least in normal use and with testing via the various MikePan Scenes - with the exception of the classroom
32 or 64 tile size seems to be best for CPU - depends on scene.
for GPU, 512 tile size is no longer the best for me, when using GPU only I mean; It seems to be 256 or even 128 in the tests I’ve done for GPU.
It might be that computers vary, and that scenes vary between computers, so check imo.
Fishy Cat 2:32.07
Fishy Cat 4: 36.89