6970 on 406 Mhps at 74C? Nice! Seriously, that's cool and quite for these stupid things. Can't get any 58xx where I live, and my only option is watercooling whic as a mechanical klutz I'm not sure I can do. If you you hate the noise, return 'em. I've got 6990's and I have to go with a 6970 for my next card.
BTW, what settings (OC, UC, miner and flags) are giving you 406 Mhps on your 6970? Also, downclocking mem below 440 drastically increases stales on my 6990, and below 550 increases them from 0.5% to 1.5%. Something to keep in mind when you UC mem.
1002/340
I used the CCC(Amd OverDrive) to turn up the +20% power after I used the MSI Afterburner, cause it was only getting like 340 or something without it. Too bad MSI afterburner doesn't have that option :/
Using the newest GUIminer with phoenix miner flags are: WORKSIZE=128 BFI_INT AGGRESSION=11 VECTORS (Haven't really messed with the flags that much)
If I get tired of the fans I might get a watercooling unit.
Edit: also might be worth getting Phoenix rising instead of GUI miner; due to the fact that you can set it to cooldown after it hits a certain temperature as a precaution so you don't brick your cards.