Originally Posted by J-Mag
Do we really know what these timedemos are doing? I've always thought that software rendering tests were worthless when you use your GPU to render in the real application...
Maybe an OS related thread is taking up the 3rd or 4th core. Would there be more OS stress if an application is using CPU/Mem vs a dedicated GPU render?
No we don't really know but it seems to be pre-recorded "actions" that are being played back at realtime and since a lot of phyics are involved it does put plenty of load on the CPU. Framerates are comparable to the actual demo framerate and they are affected by ingame settings and cfg settings.
I ran the CPU timedemo once at 1920x1080 and the CPU load on core1 was around 80-85% and core2 a little higher 85-90%. Then I reduced the resolution to 800x600 and this time both cores were very similar at about 90-95%.
I'm not exactly sure how expreview.com tested but since the tests were done at the same frequency it should reflect CPU efficiency and architecture incl. core count, at least thats the way I understood it.