Dostya :
The happy merchant will give me Crysis 3 and Bioshock Infinite if I get the Asus GTX 660, but is the 7870 worth the extra 20$ and no games.
The 7870 XT (Tahiti LE) version is comparable to the GTX 660Ti if not a bit more powerful, the normal/older 7870 (Pitcarin) is equal to the GTX 660 in performance, maybe a bit more powerful too
but how come the seller is giving Crysis 3 and Bioshock infinite with the 660, those titles are bundled with AMD cards with the Never Settle promotion, i think you should look into this