I upgraded to them. I didn't take any benchmarks before or after but looking at my average FPS in games, I've noticed no difference in performance at all, or anything else.
But, Vista does seem stabler.
__________________ Alienware Area-51 m5550 2 gb ddr2 ram 2.0 GHz core 2 dual 256mb Geforce Go 7600 100 Gb HD 7,200 rpm Wireless Draft-N-card Vista Home Premium