I've only found this Solaris blog, but don't understand it well enough: http://blogs.sun.com/gavinm/entry/amd_opteron_athlon64_turion64_fault
Can't provide you more details, because my dedicated server is under hoster's "hardware tests" since 5 hours :-( (and I guess everyone will run home for the Germany-Spain game soon)
Regards Alex
MCE 0 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor CPU 0 4 northbridge TSC 111a60c5584d4 [at 2500 Mhz 1 days 9:25:51 uptime (unreliable)] MISC c008000001000000 ADDR 1148f5940 Northbridge NB Array Error bit35 = err cpu3 bit42 = L3 subcache in error bit 0 bit43 = L3 subcache in error bit 1 bit46 = corrected ecc error bit59 = misc error valid memory/cache error 'generic read mem transaction, generic transaction, level generic' STATUS 9c1f4cf8001c011b MCGSTATUS 0 No DIMM found for 1148f5940 in SMBIOS