Disabling core on AMD Phenom II?

[GoogalyMoogaly]

Hi,

So I've decided to put my mATX AM3 motherboard and Phenom II X6 1055T into my 'HTPC'.
You're all probably thinking like me, why do you need 6 cores in an HTPC?
As you've probably guessed from the title, I don't.
Now disabling the cores is easy on my motherboard (Gigabyte GA-880GM-UD2H). What it doesn't seem to do is lower the VCore at all.

Am I just wrong in expecting a 4 core PII to use less VCore than a 6 core PII?
Is that not how it works?

So I guess I'll need to do it manually?
The 1055T is 2.8GHz with a 3.3GHz boost. Knocking this down to 4 core makes it close to a PII X4 925 I believe. What sort of VCore would you expect from that?

Does it seem reasonable to expect to be able to lower my VCore to that sort of range?

 

[GoogalyMoogaly]

Why do you want to disable the cores? It will not use the cores unless it needs them.

Yeah, I did think that too.

Fair enough, might just leave it then. Well until I can be bothered to just manually undervolt it. I seem to remember the chip being really good on voltage up to 3.5GHz, so at stock it'll hopefully come down a bit from stock.