Le sigh.
EVGA 02G-P4-2683-KR GeForce GTX 680 SuperclockedCore: 1084MHz - 1150MHz
Memory: 2GB 256-bit GDDR5 @ 6208MHz
Outputs: HDMI, Display Port, DVIx2
Other: Nothing
EVGA SuperClocked+ 02G-P4-2684-KR GeForce GTX 680Core: 1058MHz - 1124MHz
Memory: 2GB 256-bit GDDR5 @ 6208MHz
Outputs: HDMI, DisplayPort, DVIx2
Other: Nothing
EVGA 02G-P4-2685-KR GeForce GTX 680 SC Signature+ w/BackplateCore: 1084MHz - 1150MHz
Memory: 2GB 256-bit GDDR5 @ 6208MHz
Outputs: HDMI, Display Port, DVIx2
Other: Comes with a backplate
EVGA 02G-P4-3686-KR GeForce GTX 680 FTWCore: 1084MHz - 1150MHz
Memory: 2GB 256-bit GDDR5 @ 6208MHz
Outputs: HDMI, Display Port, DVIx2
Other: Uses vapor chamber cooling
EVGA Superclocked, Signature 2 02G-P4-2687-KR GeForce GTX 680Core: 1097MHz- 1163MHz
Memory: 2GB 256-bit GDDR5 @ 6208MHz
Outputs: HDMI, Display Port, DVIx2
Other: Two fans, highest clocked
Consider this a courtesy, and look a the specs next time, because it's pretty obvious what the differences are (Except the FTW version, had to look that one up). And if they are none and they're priced differently, then take the cheaper one, $20 isn't going to get you OMFG features at this tier.