NO WAY lol
with 3.7 I had to set my gp4 graphics setting to a low level with 18 fps
with 2.5 I can set my gp4 graphics settings to high level with 22 fps
but one thing to watch for is the graphic card you got .... I have Gigabyte Radeon 9000 Pro 64 mb and do not fully support 9.0 ,only 8.1 , and this driver is the last one optimized for 8.1 , meaning that catalyst 2.5 is the "perfect" one for my graphic card. And gp4 is optimized for directx 8.1 .... etc.
So if you have a 9500 or 9600 or 9700 or 9800 I can´t say which driver is the best one ....
just give it a try , you can uninstall the drivers at any time