Sunius :
No way HD 7850 is better than 660 Ti. Hell, it's even faster than HD 7870.
Do a little research yourself. The 660 TI has a GK104 with the same core config as in the 670 and a memory bus like a GTX 550 TI. IT is extremely unbalanced. A card with a weaker GPU but greater memroy bandwidth can beat it with ease. Look at the 660 TI's minimum frame rates. They're crap. That it has high averages is because of its GPU getting huge maximums. High averages, but low minimums, (huge maximums) is crap compared to decent minimums and decent averages.
Regardless, the 660 TI can't overclock much at all and the 7850 can be pushed farther than a stock 660 TI, especially in the minimum frame rates. The 660 TI comes up short compared to a well-overclocked 7850. The 7870 can go considerably farther than the 7850 (enough to be worth the price premium, unlike the 7950 and the 7970 where the 7950 is about equal to the 7970 when both are overclocked) and get a significant win over the 660 TI. The 7950 can have a huge win over the 660 TI when overclocked, but if buying Borderlands 2, that's also more expensive than a 660 TI, hence the 7850 and 7870 talk.
Throw some decent AA into the equation with OC versus OC and the 660 TI doesn't just come up short, it falls apart in comparison. An unbalanced card is worse than a balanced, lower end card in far too many ways. Would you want to play without AA just because the card can't handle it as well? Heck, with the 660 TI's huge memory bandwidth bottle-neck, it might even have more stutter problems in addition to its poor minimums.