Just Got my system up and running haven't OC'd anything yet, everything in my sig is stock except the Palit Radeon HD 4850 which I let ATI Overdrive have it's way with.
Stock the card runs 625/993 at ambient temp of 24C with case wide open temps are 32C idle / 41C load (2 hours of crysis everything on High 4xAA).
With this card OC'd idle is 37C and 47C load (again 2hrs of Crysis).
Guess I can still push it more but for some reason when I crank ATI overdrive up to it's max it passes but then 3dmark 06 freezes up and says "IDirect3DDevice9::Presentfailed:devicelost(D3 DERR _DEVICELOST)" Strange as I can play Crysis just fine with ATI overdrive set to 675/1050 which is the max the sliders go. Other than this small prob the card seems very cool and I expect to reach somewhere around 15K 3dm06 score once I tweak my HD and OC the E8400.
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CoolerMaster CM 690 - Asus P5Q-E - Intel E8400 Wolfdale 3.0 GHz @3.85 1.26v - Corsair TX 750Watt - OCZ Vendetta 2 *Lapped - 2x2 GB Corsair Dominator PC2-8500
XFX GTX 260 Black Edition @ 666/1150/1404 - Seagate Barracuda 7200.11 640 GB - Samsung Lightscribe DVD+RW SH-223Q - 22" Samsung SyncMaster 2253BW