GTX 670 FTW vs Radeon 7950

wotot2

Honorable
Dec 26, 2013
16
0
10,510
Hello there,
I currently have two MSI 7950 twin Frozr's in crossfire powering a three display setup for mostly gaming. I was offered a trade of two 670 FTW editions for my current graphics cards.
Is this a good trade? I'm mostly interested in the 670's because they have 4gigs of ram over my 7950's 3gigs. From what I've read, more VRAM is better for a multimonitor setup.

Is there any performance difference between the two of them that I should be concerned about? Or is the performance mostly equal and its worth it to have the extra gig of VRAM?