(05-13-2012, 11:09 AM)NaturalViolence Wrote:Quote:Furthermore,which is even more interesting,in the third test,why is there no 36 fps at all resolutions ? Why fps still scales when lowering resolutions to 53 and 67 fps when card can deliver 99 fps at higher settings ? Only explanation is that perfomance is affected by cpu when changing resolution,not gpu.
That's the only explanation you can think of? REALLY?
No. It's a bandwidth issue. Without a cached copy the efb copies have to be constantly updated before either thread can proceed. This causes both threads to stall while a new copy is created and downloaded/uploaded (not necessarily in that order). The bigger the copies are the longer this takes. This slows down rendering tremendously.
And you are saying updating efb copies is slower when higher internal resolution is used ?