Quote Originally Posted by Amurtigress View Post
Hiho,

the DRAM reference voltages in the BIOS are defaulting to 0.75V on the X58A-UD7, as we can all see. However, what are they really set to in Auto mode? This can be absolutely crucial, I remember on the P6T Deluxe deviating too much from 50% VDIMM was causing trouble quickly.

I just set them all to 0.83V to make sure they are exactly half of the 1.66V I run my Corsairs at.

Any idea what the BIOS is doing? ET6 apparently doesn't really read out the true values.
When left in auto, you will see .75 in easytune always as this is default amount of 1.5V default voltage. They will be .825 at 1.65 if left in auto. If you want to manually set them, please set .75 at 1.50, then raise your ram voltage to 1.65 and you will see them automatically increase as you manually raise the Vdimm value.

Same applies with MCH and CPU Ref, then are automatically adjusted with their respective voltages - Vtt in this instance.

CPU Termination (Vtt) Automatically changes the following if manually set >>>

CPU Reference Voltage (.63% of Default Vtt/1.20) .76 ET
CPU Reference2 Voltage (.67% of Default Vtt/1.20) .80 ET
MCH Reference Voltage (.63% of Default Vtt/1.20) .76 ET

DRAM Voltage Automatically changes the following if manually set >>>

MCH/DRAM Reference Voltage (.50% of Default Dram Voltage)
DRAM Termination Voltage (.50% of Default Dram Voltage)
Channel A Reference Voltage (.50% of Default Dram Voltage)
Channel B Reference Voltage (.50% of Default Dram Voltage)

I have a guide for Easytune Vs BIOS in regards to this and MCH Ref linked in my signature. Pics will be back online in a few hours if they are not already