I have a couple of cards, a PowerColor HD7850 and a VTX3D HD7770. I'm trying to under-volt the VTX3D 7770 initially.

Even though atiflash says it worked, when I start GUIMiner the VDDC is reported at 1.175v, even though I've modified the BIOS for a lower value. Have tried VDDC settings of 1125, 1075 and 1025.

The steps I took are:
- Used VBE7 (0.0.7b) to:
  - backup the original BIOSs
  - modify the VTX3D 7770's BIOS fan profile and VDDC State 1 - Performance
- Booted into DOS and used the atiflash (4.17) to flash the new bios to the VTX3D

The change in fan profile does seem to have worked, but not the VDDC settings. Have I missed a basic step??

OS is Win 8.1.