Mac Ati Radeon

How is an ATI Mobility Radeon X1600 compared to GeForce 6600GT a (PCI-E)?
I am looking for background information that I want placed side by side and compare the two letters, but ideally I would like to see a review that was tested in the two letters of the same factors. Also, if anyone has any experience with maps _both_, please tell me your experiences subjective or objective. Basically, I want to know if Macbook Pro beyond my current PC (AMD64 3200 + 6600GT 1.5 GB RAM) machine in the game (I assume you have the same amount of ram). I found an evaluation test all products against a Mac machine very similar to mine and my machine has killed all the macs, but I can not say if it was Processor Board or the video that caused the speed – and I would like specific information about the video cards themselves. Thank you, oh, not speculation, Please, I can think of with enough of this on my own. If you do not have sources to cite the reference points or test process standardized, do not bother posting.
http://freestone-group.com/video-card-stability-test/benchmark-results.html
