"Yesterday we covered the graphics hardware needed to handle
Beryl (GPUs & Beryl: What is Needed?) and on the heels of that
article we are taking a quick look at another Linux versus Windows
comparison for the official ATI/AMD graphics drivers. NVIDIA's
Linux and Windows drivers perform about the same and in some
instances the Linux binary driver even running faster, but as we
have been sharing now for many months the Linux fglrx driver is
handicapped for performance. Has things since improved for ATI?
Well, as you'll see in this article by using the official Linux
driver from ATI/AMD you can expect your frame-rate to be cut in
half compared to the most recent version of the Windows Catalyst
driver..."