I popped my X2 in with DFI BIOS 5/10 and it came up as unknown hammer. When switching to "ACPI multiprocessor" in XP it still only showed one CPU. So I upgraded to the 6/18 BIOS. This detects the CPU as an x2 4400+ but it blue screened going into windows. I was able to run a few tests from Safe mode. Not bad getting 588 in Cinebench at stock settings in safe mode It did well in crystalmark too.

I decided to go through the repair process for windows XP. I have a copy of XP with SP2 integrated. It comes up unknown and gives me a choice of standard PC or other (required driver on floppy). I went ahead and choose standard, everything boots fine but it will not let me change from standard PC!

Any tips getting this switched back to ACPI multiprocessor PC? I'm trying windows updates and messing with the AMD drivers. Just curious if someone else has ran into this and has a fix before I spend a whole bunch of time working on the fix.

Eric