Should I expect gfx improvement from Radeon 6970M to GTX 660M?

[yalag]

Should I expect gfx improvement from Radeon 6970M to GTX 660M? I'm upgrading to the new thinner iMac and I was wondering if it'll help my photo editing tasks (aperture, iphoto etc)?

 

[AT06]

Those two cards are around (roughly) the same performance so the difference will be negligible. I would save for a higher end GPU, or not bother wasting the money upgrading.