Processor/cache recognition and vista 64

I'd like to know wether or not Vista (in my case Business 64) uses

- both processors (both 4 cores)
( I use a 2 processor quad core AMD Opteron 2376 on a TYAN thunder
3600B Mainboard (16Gb RAM ECC/Reg) with a normal loadout of JBOD SATA
HDD's and a DVD-RW)
(It seems to do so but still, It reports my 8 tasks running as 12 and
13 percent (4 of both, together makes 100 , if this is percentages of
total capacity then it's okay))

- level 2 and L3 cache (4x512 and 6144 respectively for both
processor-dies )

I know it's on the system (I checked with CPU-Z but it only does a
readout of the CPU, not a functionality check) but how do I check it
works?

I am not a complete computer noob. But this is my first multicore
system.
(I also have a old AMD Atlon64 3000+.)

If it doesnt, I'd like to know where I could find the setup in the
Registry to correct this. (probably hkey_localmachine/system/ ? )


--
paxv