Apparently just as good.
![]()
![]()
Back to OP, pricing does not mean equal. You have to compare tiers. 680 vs 7970, 670 vs 7950. Within the tier, they are generally within 10% performance, depending on the game. The 7970, however, does have the potential to go very far. Between the 7970 and the 670, the 7970 is a far faster card.
Generally, in the same tier, nvidia and amd will perform very similarly, but the nvidia card will cost a bit more. The amd cards will, if all things go well, overclock better than their nvidia counterparts. Nvidia cards will generally run with less power and heat generated, and the 670 and lesser cards will have smaller PCBs, if you have tight spaces. However, the 7970 and 670 are across two tiers, which means for the same price, the 7970 will be a bit better.
http://www.techspot.com/review/645-tomb-raider-performance/page3.html
7970 kills even Titan