as described in amd's cnq guide i should get a
amd cnq tab in the power options in w2000,
(where i should enable automatic mode),
but i dont. and i have checked my cpu speed,
it always run at 2ghz

I have followed amd's cnq guide and have enabled cnq
(and acpi) in the bios, installed the driver and
chosen the minimal power scheme.

I have 2 amd64 3000 machines, one with msi board,
and one one with asus, but on none of them i
get the extra amd tab.

I'm sure you've prolly already done this, but have you downloaded the "C n' Q" software from amd processor utilities section?

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AMD Opteron 170 \ DFI UT nf4 Ultra-D \ evga 7600gt \ 2gb (2x1gb) G.Skill pc4000 HZ \ NEC 3550a DVDRW \ WD Raptor 150gb \ Seagate barracuda 80gb \ Mitsumi floppy \ OCZ powerstream 520watt