Originally Posted by brettjv
I know they aren't LITERALLY having to warm up, that's why I said it's 'like' that.
And as I'm constantly telling people around here, GPU Usage that's lower than full *may* be due to the CPU, but they do not *have* to be. Not by a long-shot. This phenomenon can be caused by many things.
And ya also cannot positively confirm or deny a CPU bottleneck by looking at the CPU usage graphs in the Task Manager
A GPU will always
try and go to 100% and pump out max FPS unless something external is influencing it. Some examples would be:
CPU limit not sending enough data to the GPU's
GPU throttling due to heat
Game built in FPS limiter
(under CPU limitation you can fit HD and memory access, bus speed limits, etc)
Since my 480-SLI system with i7 @ 4.2 Ghz has troughs in it's GPU usage during the benchmark and I don't exhibit the last three examples, at that point I am CPU limited.
A perfect example is if run the Benchmark at 1680x1050, my GPU utilization trough's significantly in spots, sometimes as low as 50%. CPU limit here. At 2560x1600 with 4x AA, the GPU's stay virtually maxed the whole time. GPU limit there.