Quick update on RAM voltage, and spread spectrum -
I had R&D look into this - actually any software reading of a voltage (even bios) can be off from the actual voltage at the cpu. It's an approximation. So we did 3 tests. What does bios say, what do the voltage points on the x570 master say, and what can we read from the cpu socket.
- Set ram to 1.35 (xmp or manual, same result)
- Save, exit, reboot.
- Bios said 1.38
- Voltage points said 1.37
- Cpu socket said 1.364
So there does seem to be a 9mV "overshoot" in this test but to be frank that's really not a big issue. I get that we all want to set x and see x, dead on, no variance, just rock steady exactly what we put... But that's not really how voltage works. The number we put in bios actually goes through a large equation that also affects other voltages. It's all interdependent.
You would see the same thing with vcore. Software, voltage readout points, and testing the cpu socket will all be slightly different and rarely exactly what you typed in bios.
This is also a function of our philosophy when it comes to bios, temperatures, etc. We show you the value without any trickery. The same way we put vrm temperature probes smack in the middle. We could offset the probe a few mm and lower the temp, but what's the point? To what end? The idea behind readouts is to give you the most accurate information so you can tweak, optimize, or just check how the system is running. We are doing the same with voltage. We could set an offset to "show" 1.35v, even if the cpu is getting 1.364, but we don't. We are looking into ways to display a closer approximation of the voltage, ie 1.364 just like the cpu socket, but we won't do this through a magic hidden offset.
If you are dead set on getting as close to exact as you set you could try going 0.01 lower than you want, but even that is an approximation and will vary based on board, Psu, and cpu. The only true way to dial in an exact value would be to probe the cpu socket and test various settings until you hit the exact voltage you want.
Tl;Dr it should be fine. If you want to see a lower voltage then lower the input (~10mV) and see if its stable.
P. S. Ryzen master appears to just be reading the register (ie setting) from bios. Not what the voltage sensor says. The sensor is doing its job, but impedance affects reading vs reality.
This setting has been asked for to lock in BCLK, however its already OFF by default. We will add the option into next BIOS release, however from our testing it doesn't seem to do much (anything?). We tested on other vendors as well and confirmed it has no effect at the moment. We will try to fix on our end, if possible, but again the same behavior can be observed on other X570 vendor boards.