I sent my Geforce GTX 680 SC Signature 2 series on RMA. And just checked and shows I'm getting a 770 sc back. I paid $479 for the 680 and now I'm getting a 770 $339 card if there were no 680's available shouldn't I get the 780?? Seems strange to me.
 
 
 
680 SC Sig2                                                                                                                780 SC
Memory DDR5 256bit 2048mb  mem clock 6208mhz Bandwidth 198.66GB/sec                 Memory Clock 6008MHz DDR5 384-Bit 3gb of memory
Stream processors 1536                                                                                               Stream Processors 2304 
[link=javascript:void(0);]Core Clock[/link]1097MHz                                                                                                     Core Clock 941 boosted 993
 
 
Basically same specs only difference is 1gb of memory. This card is closer to my Sig 2 series 680.