D975XBX: CPU VID & BIOS problems

[LeeCat]

Brief description of my system:
- D975XBX rev. 305 with OC Debug mod.
- BIOS 1304/1334 (the same results and problem)
- CPU Pentium D940
- 2GB RAM
- Asus nVidia 6800.
I think the rest isn't critical but I can supply any additional info if required.

The problem:
Any setting for CPU VID in Advanced - Default Configuration Override menu does not change the value monitored in Hardware Monitoring window (see attachment). The same results I'm getting in Windows with SpeedFan. After getting the information that SpeedFan and similar 3d party software resets the CPU VID to default I cancelled the use of all 3d party tools at all and continue with original Intel tools such as IDU & IDCC only. It didn’t change the picture, still any settings in either BIOS or IDCC not reflected in both BIOS and IDU.

I can see the following possible reasons for it:
- Bugged voltage sensor;
- Bugged voltage regulator (does not react to VID change);
- Software bugs.

I don’t think the 1st one is valid – I can see the Vcore changes from 1.235V (CPU unloaded) to 1.212 - 1.213V (CPU fully loaded with ORTOS) in IDU which complies with “general logic”.

I don’t know what else I can do to prove either 2nd or 3d of possible faults, where can I do any physical measurements for Vcore on the board.

Any help will be much appreciated.