Feels silly to bump my own thread but we really need to resolve this issue.
After further investigation it seems as if the problem is video-RAM overheating on some cards.
Is there anyone who actually works for AMD who can at least confirm that they have seen this thread?
We are currently developing a title which is able to overheat some of our machines using a HD4800.
We are currently considering implementing a temperature monitor and using readings from that to frame limit and activate vsync.
We have also reproduced this problem with one of the DX9 samples and FurMark.
On at least one card the idle temperature is 87c!
Any thoughts or suggestions welcome.