Hello, apparently powernow on Opteron quad-core is not recognised; when I kldload cpufreq (leaving it out of kernel) I get : pci0: driver added pci1: driver added pci2: driver added pci3: driver added pci4: driver added pci5: driver added pci6: driver added found-> vendor=0x9005, dev=0x0285, revid=0x00 domain=0, bus=6, slot=14, func=0 class=01-04-00, hdrtype=0x00, mfdev=0 cmdreg=0x0196, statreg=0x0230, cachelnsz=16 (dwords) lattimer=0xf8 (7440 ns), mingnt=0x01 (250 ns), maxlat=0x01 (250 ns) intpin=a, irq=28 powerspec 2 supports D0 D1 D3 current D0 MSI supports 2 messages, 64 bit pci0:6:14:0: reprobing on driver added pci7: driver added pci8: driver added pci9: driver added pci10: driver added but no dev.cpu.0.freq* showing up. When I dig up the by me so beloved good old acpi_ppc it says : cpu0: Px state: P0, 2200MHz, 28000mW, 19us, 19us cpu0: Px state: P1, 2000MHz, 26250mW, 19us, 19us cpu0: Px state: P2, 1700MHz, 23750mW, 19us, 19us cpu0: Px state: P3, 1400MHz, 21250mW, 19us, 19us cpu0: Px state: P4, 1100MHz, 18750mW, 19us, 19us cpu0: Px method: Unknown, disabled This box will probably stay at my office for a while and I'd be glad to provide more information. Best, Arno