***Asus Rampage III Extreme Owners Thread***

[spoolindsm127]

It's actually Extreme OV, I believe those settings are for the ICH, QPI PWM settings.

PWM frequency has alot more settings, in khz

Yes, that is what I was referring to in regards to the Auto, 1x, 1.33x settings.

It's Extreme OV.

QPI PWM Frequency acts exactly the same way as CPU PWM Frequency. It increases the number of times the power FETs switch per second to generate the clock signal. I think intel spec is default 250KHz. But who knows what asus is using as base. We would need to measure it. It might be 500KHz. In any case. If 250 is base, that makes 1.33x 332KHz, or if it's 500KHz 1.33x is 665KHz.

A higher PWM Frequency lowers output ripple, but makes a lot more work for your FETs(lots more heat).

My guess is auto selects 1x below a certain BCLK and 1.33x above a certain BCLK. I played with QPI PWM Freq hoping it would allow me to lower my QPI voltage, but it did not help. Maybe at extreme bclk.

I knew those PWM settings were in relation to some other setting. But I didn't know exactly what.