CPU/ Ram Voltage

Solution
Yes. Ryzen uses DDR4, and the JEDEC standard for DDR4 is 1.2V (down from 1.5V standard for DDR3).

There can be variances, depending on the kit, A-XMP profiles etc, but 1.2V is the "standard", yes.

OwenTheGamer

Honorable
Aug 13, 2016
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Barty1884

Retired Moderator
XMP, or A-XMP, or some other variance is a profile that can be enabled in the BIOS to run your RAM at faster speeds.

If you buy a kit of DDR4 @ 3000MHz.... when you connect them and boot the system, they'll run at the 'standard' 2133MHz by default. You'd enable XMP (or whatever it's called by your specific motherboard manufacturer) to run at the rated speeds. Should be a relatively straightforward process. "Enable" and save/exit your BIOS.