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What are the NB voltages on Z790 Aorus Elite AX called?

There are lots of voltages in the BIOS but they have strange names, so I'm wondering what are the names of the following:

 

CPU/NB voltage

NB voltage

 

I need these for fine tuning my RAM and I intend to set them to some conservative value (any suggestions?) before tuning the RAM timings so that I know their values and don't end up with the BIOS auto-configuring them to something obscure.

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I think that's referring to the PCH voltages, though having done a ton of RAM tuning on LGA 1700, those voltages don't do anything for memory overclocking. They can technically help in some instances, but IMO they aren't worth touching in most circumstances. The ones that do matter are VDDQ TX (might be called CPU VDDQ), VDD2, System Agent (might be called SA or VCCSA voltage), and then to a lesser extent all the PLL voltages. 

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