Well, I am not exactly sure how this happened, but

to duplicate issue:

Watch an HD video through VideoLAN + started game while at UVD (550/900) mode on screen (no matter it seems what 3D game it is). Seems to happen while AA is disabled and 60fps limiter was on.

All the suddently fan of card started spinning like crazy and when I looked on MSI Afterburner 1.650v and heat 90-100 degrees was dropped on card which is out of even the 1.35v so called safe scale.

So, for no one to burn their cards I'd suggest someone takes a look at this.

My equipment are ASUS Maximus Formula, Q9450, ASUS HD5850, Windows Vista SP2 including the "DirectX 11" platform patch fully updated.

Catalyst I tested this happening 'v9.10' and the 'v9.11 beta 4' (ATI Stream) in clean system.

Incorrect information was added. This does apply to v9.10 as well.

Lets rethink again.. Seems the bug is in v9.10 WHQL also.. This doesn't look very nice. here's picture of MSI Afterburner v1.30 straight after few seconds of playing HD video. Seems on Idle it restores 1.648v, lol, when stressed it's 1.087v as usual like somehow the 0.950v would of transform to 1.648v.

Looks like problem is "solved" the issue was a multiple voltage monitoring tools running simultanously. I was running Lavalys Everest 5.30 + MSI Afterburner 1.30. Although, also happened with compination of ASUS SmartMonitor + Everest 5.30.

Looks like without running everest as sidebar &/or updating MSI Afterburner v1.40 beta solved the issue.

Here's an official or not so official explainatory on VRM or Volterra Module from one NVIDIA thread probably also affects the ATI cards as seems to use same module:

"Added support for voltage regulator output and average current monitoring on NVIDIA GeForce GTX 260 / 280 series. Please take a note that Volterra voltage regulators are rather sensitive to frequent polling and may return false data under heavy load, so it is not recommended to use VRM monitoring in daily monitoring sessions."

seems it's not only false data also nasty damn voltage jump.