I used reference 7970s for a long while and I think 1150 is pretty easily obtainable with 50% manual fan or less, which isn't really that loud. You could probably do it with 40% manual fan which is reasonably silent......you can do 1100 or less with auto fan (PROBABLY). The fan on the 7970 isn't noisy at all unless you push high manual fan curves, it is quiet on auto.
Anyway, I oc'ed my references to 1150 with 50% fan with no issues really, I suspect you could get away with a less aggressive fan curve. Of course every chip is different so my experience may not match someone else.
This deal is killer for sure, that game bundle alone is pretty insane for the price.....If AMD made the MSRP of these cards around that level I'm guessing they would make an absolute killing. From what I gather these visiontek cards are selling like hotcakes at this price.