Undervolting Penryn?

I have a P7550 and have a few questions.

I am using CCPUID(to get the .5x) and undervolted to 1.013, but CPU-Z reads it as .9v; which is correct?

Also CCPUID seems buggy, it wont keep the undervolt. I ran Orthos for an hour, and at 45min the undervolt was good, then all of a sudden it went back to OEM VID.

Semi off topic, but is it only my processor or does it only use 8.5x and 6.0x? I had the middle multiplier as 8.5x at first but, i thought thats why it was conflicting VID, so i put it as 7.5x; would that make a difference? What about the speedstep control, should i let that be, or can i use that function instead?

Any insight would help, thanks

 

I have P7450 and ended up prefering to use CpuGenie
All my multiplers are at 0.925v expect my highest (8x) which is 0.962V
Is stable as a rock

 

Yea, I'm thinking I might need to pay the $15 for that too. I've been trying to mess with the speed step in CCPUID, but it doesn't hold the voltage. Btw, does CpuGenie detect the stock voltage?

 

Yes detects stock voltage - think it has a month trial period to try it out also.
I don't think it actually does anything with the half multipliers altho it does show them...
Only stepping i see are multipliers that also say "yes" in ACPI State