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If your BIOS is doing this (as opposed to you mucking with the settings), I need to get the AMD BIOS developers to talk to your BIOS developers.

That would be great. Please do that. What's shown above is indeed the mtrr settings that come from the bios. I didn't change anything. And that's the same on two different PCs (both iwth A8V), so it's not that just one PC is broken or sth... However, whatever problems I was reporting to ASUS, I never got anything helpful back, or a fix in the next release etc. They seem to ignore user bug reports, but I guess they won't ignore AMD...

What motherboard, BIOS vendor, and BIOS version are you using?

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You may want to check if your BIOS has an option for "Discrete" or "continuous" usage of MTRRs. Experiment with both settings - I believe "discrete" should work better in a memory hoisting environmnet.

Unfortunately not! I read about other mainboards having this option in the bios and looked for it carefully, because other people reported they could fix the problem with the fglrx driver using this setting. Unfortunately, Asus didn't put such a setting in their latest release...

They're supposed to have done so, after a huge fuss we had over these issues last year. After you give me the motherboard models, BIOS vendor, and BIOS version I can hopefully get this resolved. -Mark Langsdorf AMD, Inc.