Just got my card in today and installed it and even though the box doesn't state it, the card is the Superclocked model!
648 core vs 633
2376 memory vs 2268
A few people at Newegg have reported the same thing. Glad I got it from them.
I haven't played any games yet but it is idling at 47C with stock 40% fan speed. I turned the fan speed up to 60% and still can't hear it and it dropped to 44C at idle. My old 7800GTX 512 would run at 42C idle so not much difference in temps (idling anyways).