If you get a chance, take the card out and have a look to see if there is a heatsink on the VRMs, thr reference card didn't but also alot of none reference cards didn't either.
But since its a SC version it may well do.
I could have sworn that my card did but a week ago or so I happened to be reading something the said the reference 460 didn't have heatsinks on the VRMs. Too my card out and tru enough there wasn't.
I looked around a bit mre and quite a few people were a tad miffed that other none reference 460s didn't have them either.
A quick google says only the FTW version had VRM sinks.
And sorry to hear that your planned rig went to pot