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.