No such luck on MSI's v1.2 bios for this K8 Master F. The only tangible difference seems to be that it steals memory in smaller chunks (now I got ~3768MB until I re-enabled the IOMMU and gave it 256MB). No new options in the BIOS menu...in fact several options seem to have disappeared. PCI bus 1 appears to have been renumbered 4. I also don't remember seeing these in the lspci output before: 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 00:19.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 00:19.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 00:19.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 00:19.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control They sound ominously relevant. But a fat lot of good it does me. And they've redone all the ACPI stuff so now I seem to be able to monitor the cpu temperature etc: ACPI: Processor [CPU1] (supports 8 throttling states) ACPI: Thermal Zone [THRM] (50 C) ACPI: Fan [FN00] (on) ACPI: Fan [FN01] (on) That's new. But effectively no change to mtrr: reg00: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1 reg01: base=0xd8000000 (3456MB), size= 128MB: uncachable, count=1 reg02: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1 That's sized a little better, but still overlaps the video cards' frame buffers. mtrr: type mismatch for f5000000,1000000 old: uncachable new: write-combining And the IOMMU aperture is still at an impossibly high address: Checking aperture... CPU 0: aperture @ 1b00000000 size 256 MB Aperture from northbridge cpu 0 beyond 4GB. Ignoring. At this point I'm mostly writing for the benefit of any others who might google this in the archives. -- David W. Hankins "If you don't do it right the first time, Software Engineer you'll just have to do it again." Internet Systems Consortium, Inc. -- Jack T. Hankins