Changing from nVidia to ATI

was there something in the three responses you didn't like?

part for part, the 5770 is way better, and considering how old the 7950 GX2's are, yes, you will notice a significant difference. This is assuming that what you are playing is up to date on technology as well. Meaning, if you're playing today's game on ancient tech, you'll see quite a difference. But, if you're playing ancient games on today's tech, the difference won't be as significant, but still noticeable.