They are correct, raising your resolution should put more of a load on your GPU while at lower resolutions the CPU does most of the work.

You should be able to raise the resolution quite a bit and see barely any performance loss.. Maybe 5fps, but your crossfire setup will actually get stressed then.

@ Corrupt Soul: nah, I resized and cropped it, I am not quite sure what made it all squished. I will get a new avatar anyway because like you said, it causes confusion.

MAn don't worry game will even run at higher settings because of your i5 processor.
I mean look at mine.
core 2 duo E74
sparkle 9600 gt
2 gb ram.
But I still hope it will run at low settings on mine.

just replace the graphics card... with a gtx 460 or hd 5850