- I monitor the temps with Everest Ultimate, outputting to a gadget on my secondary monitor. With the fan set at 35%, they never exceed 70c, and the readings are consistent between 7 and Vista. So I can assure you that heat isn't the problem. Good suggestion though.
For more detailia: My Win 7 install is on the exact same computer, running the exact same clocks, and the same type/series
(Seagate 7200.11. No raid. Just a pair of HDDs) hard drive as Vista 64. The issue doesn't happen under Vista at all. And given that 7 is more... efficient would be a good word since they run roughly the same number of processes... it would be logical to presume Video stress should be a bit less if not equal. But Vista is stable, while 7 locks. From my own troubleshooting, I'm reasonably sure it's a driver/software issue. While I don't have a .dmp to examine for hard evidence, what I've found in Technet and elsewhere tends to confirm.
(Stuff like a given game running fine in Windowed mode but not at all on full screen, or fine on one comp yet buggy on another, and other random weirdness. This is besides some Crossfire headaches, and the X2 is basically a crossfire card on one PCB, so...)
For sure, I'd be singing a completely different tune were it all presented as Production Ready, but like I said before - My primary install is on another hard disc. So it's not a big deal, just what happens when playing with Beta Drivers on a Beta OS. Take notes, send them plus whatever data you collect to Microsoft, and keep playing with it.