Nope, doesn't hurt, but why not take a 670 for a few bucks MOORE over a 750 (and not even a 750Ti) .
Something doesn't sound too right, I rather find out what kind of 670 it is and look at the specs.
If its better than a 750 or 750ti spec wise and performance wtf not ?
However I'm curious as to how long it was used, did it have any probs is there a remaning warrenty ?
Have you not look at the 750ti price tag in most online stores ?
Most are going for 125-140 dollars, now if he had more money I stick him with a 750ti.
Thats why i told him and mainly you now to keep your options open.
Not saying nukes card isn't all that, if the deal is sweet fine if not I'm going 750 hunting.