for that res either should beast for a good long while, but if you look at the actual fps on high resses where they're actually being pushed, the 70 maintains about a 5 fps lead over the 50, and i mean that as in 25 v 30 which is a considerable difference at that point, if it were like 60 v 65 it wouldn't be a big deal but for those the 70 seems to pull a good lead, but still at those resses you put either should be fine, wouldn't pay more than like 30-40 for the 70 over a 50