My Son plays games including Supreme Commander on a homebuilt PC using my hand me downs. He says when the game gets real intense with action all around, the framerate is very choppy.
He has a E6600 Core 2 at 2.4ghz, 2 GB ram and a 8800GTS 640mb card. His keyboard has an LED display that show CPU and memory usage near 100%. It has Vista ultimate 32 bit.
What are should we improved first? More RAM? Newer video card? The CPU cores run about 55C on the stock fan, so there is a little room overclocking.