Thought I'd just been unlucky. Seems quite common judging from a quick google search. Mine is the HIS 7950 and it whines like mad on skyrim. I've read that limiting the fps to 60 can really help eliminate it. Some have also suggested just letting it run on a games menu over night can get rid as well. Never had a good chance to try last night.
Would excessive coil whine be a reason to RMA?
Glad I went for the Asus GTX 670 4GB just now instead of the HIS 7950, would hate to get a whiner.