Yesterday I bought the 7970DC2T to replace my crappy XFX 7970 B.E. which was voltage locked and with an awful revised PCB by XFX which didn't had a dual bios switch.
DC2T was stable at 1180 MHz for the core and 1700 MHz for the memory, but Asus has the voltage locked as usual.
I read a topic that Matrix Platinum and recent DC2T's sharing the same PCB so I flashed the card with the Matrix Platinum bios.
Voltage is unlocked and the card is stable at 1200 - 1800 MHz with no voltage increase (stock is 1,256 V)! Voltage can reach 1,4 V using Asus GPU tweak!
Asus Crosshair V Formula
FX 8350 4600 MHz - Corsair H100
16 GB Kingston Predator T2 DDR3 PC17000 (9-10-9-27 at 1866 MHz)
VTX3D 290x (1150 MHz core - 1400 RAM MHz)
Sound Blaster ZX
Corsair TX950W
Coolermaster HAF X (942)
Western Digital Caviar Black 1 TB
LG 24EA53VQ 24" Full HD
Windows 7X64 SP1 Ultimate