It is possible, but I need some information from you.
1. Is the temperature changing in GPU-Z? On some GPUs with CHL8214 it doesn't seem to change.
2. Could you please run HWiNFO64 in Debug Mode, open sensors and at this time take a screenshot of GPU-Z sensors reporting? Then please close HWiNFO64 and send me the HWiNFO64.DBG file it created + the screenshot.
GPU-Z shows two Vreg Temperatures. Vreg Temp 1 just says 0c and Vreg Temp 2 stays on 25-26c.
Cadaveca in the GPU-Z forum reports that his XFX 6950 with CHiL controller shows the correct temperature as Vreg Temp 1 and his Vreg Temp 2 is also stuck on 26c, so it seems the latter is a phantom reading and can be ignored.
Sorry for the delay. I sent this to Powercolor "I have a AX6950 2GBD5-2DH and GPU-Z does not show the Vreg Temperature (Vreg Temp 1 is 0c and Vreg Temp 2 stays at 25-26c). I believe this card uses the CHiL controller. Can you confirm that this supports Vreg Temperature monitoring?"
and this is the reply I got "I think the readings of GPU-z is suitable for BBA(built by AMD) boards only, it does not fit for every card. So it can not read very detail of other cards, this should be normal, please do not worry."