All SC and FTW cards are strenuously tested in order to ensure they can meet the advertised frequency. Not all cards can, but in a lot of cases, they can still overclock fine or even great, because we also test base frequency under certain intense situations, even though under boost clock scenarios it may overclock really high or perhaps even to the same level as standard FTW. In other scenarios they may have been on the absolute edge of meeting it.
The FTW still has the benefits of RGB lighting, 10 power phases, dual BIOS, etc. And of course, it is also at a lower price than the standard FTW part.
Quote from EVGA.
Basically, with the DT, you get a fully operational FTW that comes set with reference clocks, that may or may not OC to standard FTW levels. It's a model that pretty much failed FTW standards according to EVGA testing methods, but they'd rather sell a pot-luck card than scrap it.
I'd not waste money on it.