I still have the issue as well,
Thought I had a fix by disabling Spread Spectrum in Bios, gave me 1day8hrs uptime (normally I'd get about 8hrs) but as we speak my system is rebooting after the notorious bug(ger) reared it's ugly head again. Haven't tried the netkas SMbios trick yet, think that's next on the list for me.
What have you tried so far apart from cpus=1?

my quick specs:
Msi K9AGM2, AMD 64 x2 6000+, NX8600gt 512mb, 2GB DDR 667 Ram. Zeph 10.5.2 R1, 9.2.2 kernel.

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My Hackintosh:
Kalyway 10.5.2 Intel/Amd -- Speedstep, Netkas Smbios, AMD test patch 2.
Mobo: MSI K9AGM2
Chipset: AMD 690v ATISB600 -- SB600ATA kexts
CPU: 3Ghz AMD Athlon 64x2 6000+
Ram: 2gb Rambo DDRii 667
Graphics: Nvidea MSI nx8600GT 512MB -- NvInject 512 (fully supported 100% working)
Audio~External: Focusrite Saffire -- (100% working - ootb)
Ethernet: 8101E -- Realtek R1000 (100% working)
HDD: 320GB WD SataII (150gb Boot Partition)
150gb Lacie Firewire/USB RIP my dear Lacie.