How to read CPU voltage reliable?

Thomas · Post by **Thomas** » Sat Jan 02, 2010 11:21 am

I'm in the process of undervolting my new CPU with K10stat, and noticed that the voltage readings from K10stat differs from SpeedFan and CPU-Z - SpeedFan and CPU-Z report the very same.

Ah, AMD PowerMonitor, I thought, that must be reliable - but that one shows the same as K10stat - which happens to be the excat same as the voltages I've setup K10stat for...

If SpeedFan and CPU-Z are reliable, then it seems the actual voltages are a bit higher, approx. 0,02 volt higer, than K10stat try to set the CPU at...

So I'm a bit unsure here

Klusu · Post by **Klusu** » Sat Jan 02, 2010 1:29 pm

What difference does it make? I would not care. But, if I wanted to know, I would measure. Using a digital multimeter.

RedAE102 · Post by **RedAE102** » Sat Jan 02, 2010 4:27 pm

k10stat is giving you the VID (Voltage ID), which is a target voltage. CPU-Z and Speedfan are giving the exact voltage reading, which is what is actually getting supplied to the CPU. My AM2 board supplies LESS voltage than requested across the entire range, and the difference can be more than 0.025V at the CPU's default 1.325V VID. If memory serves, CPU-Z reads 1.104V on my 754 board when the 1.100V VID is selected, but 1.418V at the full 1.400V VID for that CPU.

Thomas · Post by **Thomas** » Sun Jan 03, 2010 12:38 am

Thanks RedAE102, that makes sense. I'll post my findings in "How low can you go" later, and it's nice to report accurately.