Unfortunately this CPU does not work. It never did when I got it and according to the heatspreader the CPU didn't work for a long time (or at all). The other socket F 'Santarosa' Opterons in my collection have scratched heatspreaders because they have been used (a lot) for testing hardware. Because this CPU doesn't have those scratches I suspect it was either DOA (Dead On Arrival) or got damaged quickly.