Quote Originally Posted by Touche View Post
1.2 - stock Vtt
x - current Vtt
y - MCH ref shown in ET
z - MCH ref real (the one in BIOS)

z=x*y/1.2

I could be wrong, but that's consistent with the screenshots.
I agree with this. Having just finished tweaking an overclock by changing the CPU and MCH ref values in ET6, I then went back into the BIOS and tried the nearest values as I set in ET6. Result was I ended getting boot loop and had to jumper CLR_CMOS to get out of it.

Using the formula shown by Touche above I was able to determine what I actually should be setting in the BIOS to achieve the same shown setting in ET6.



Example, tweaking in ET6 I find that I need 0.80 MCH reference in ET6 to remain stable with a CPU Termination (Gigabyte's term for VTT) of 1.4v. Put those numbers into the formula...

MCH ref value to set in BIOS = 1.4 x 0.80 / 1.2 = 0.933 to 3 decimal places.

I go into the BIOS and select the nearest value for the MCH ref and use the setting 0.926 (next setting up was 0.966 so that would be too high).

I then boot back into Windows, load up ET6 and MCH ref shows 0.80 as expected

Thanks for bringing the formula up Touche, it's saved me a lot of headache now that I can set ref values for both the CPU and MCH without getting infinite boot loop. It also means I don't need to load up ET6 and manually set the values each time either so have some on me