FTW DTs use stock clocks. FTWs are factory overclocked. But they still have the same power delivery as FTWs
Stock clock is around 1607, FTW clock is 1721.
Arestavo quote from EVGA forums:
Many DT cards overclock as good or better than the full FTW cards. The DT moniker meant that they did not pass EVGA's strict QC stability standards at the FTW clocks, as confirmed by EVGA tech reps.
Still better deal than the normal 1080 prices we've seen. Also EVGA gives the option to tune it yourself, which doesn't void warranty.