My home servers are primarily Opteron 2XX-based.
It seems that support for the OEM Opterons (OSP2xx, OST2xx) in BIOSes is somewhat patchy. Based on the boards I've seen Tyan and MSI don't support them in their public BIOSes (Tiger K8WE, K8N Master2, K8T Master2) but SuperMicro does (H8DAE). These CPU's will work but the ACPI P-States aren't published by the BIOS so Cool'n'Quiet/Powernow doesn't work. The SuperMicro will even take two Opterons with different power profiles - say an OSP275 and an OSA275 and correctly handle their different P-state voltages.
Since these CPU's are turning up cheaply on eBay this is worth remembering. I have a couple of OSP's in my Iwill DK8N since it doesn't do Cool'n'Quiet so the reduced 68W power envelope matters.
BTW If your K8N Master2 conks out when you enable Cool'n'Quiet you need to do this mod.
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