ASUS motherboards with adjustable VIO (inductor L41 and a diode + MOSFET nearby) regulators (+3.3-3.5-3.6V) don't use the +3.3V line from the power supply at all.
Absolutely not.
That is, not at all.

The specs I gave are the overall combined (which is typical) specs for the 5V and 3.3V. Not need to make a fuss out of it.

Look, it's great you know where the resistors and diodes and whatnot are located on the motherboard, but for me, I don't care about the electronics, I just want to get this working without spending any further. I can't use RM850x with this "hobby" computer because I need it for my main rig.

hydraphone wrote on Yesterday, 14:43:

The specs I gave are the overall combined (which is typical) specs for the 5V and 3.3V. Not need to make a fuss out of it.

Look, it's great you know where the resistors and diodes and whatnot are located on the motherboard, but for me, I don't care about the electronics, I just want to get this working without spending any further. I can't use RM850x with this "hobby" computer because I need it for my main rig.

I don't like giving ready-made solutions; I prefer users to think for themselves.
If you need ready-made solutions, you can turn to ChatGPT - ‘why doesn't the newer ATX standart PSU work if one of the power rails is completely unloaded’.
I have explained the initial conditions to you, now it's up to you.

Let me return your advice in kind: how about you take your ego-boost-seeking pointless comments to a local teenager electronics club and don't contribute to this thread, unless you have something that's actually useful? That way, we can have a construction discussion here and you can get the daily ego boost that you need by telling kids that you actually know where inductor #71 is located on a 30 year on motherboard. It's a win-win.

So the RM650x is using LLC + DCDC as it's topology, meaning the main voltage it generates is 12V and the 3.3V and 5V are generated from individual DC/DC converters, powered off of the 12V.

https://www.tomshardware.com/reviews/corsair- … psu,4611-3.html

So it should not really care if there is load on those rails or not to maintain a stable voltage. There is no cross-regulation issue in such a topology.

If you can, try to give the rails of the PSU a measurement for the 3.3V, 5V and 12V rails with a DMM, checking if there's anything "out of the ordinary"

Thanks, tehsiggi, that's useful. I doubt there are such issues with the RM650x, since I was using it until yesterday on my main rig. I also just tested with Luck Star 6ALX with a Mendocino Celeron and it's working fine with it.
I got the RM850x recently and swapped with RM650x yesterday, after I tested the ASUS CUV-NT with RM850x. Worth checking indeed, though.

I was suspecting if ASUS CUV-NT is known for being picky about certain transient behaviors/timings or timing of the PG signal, but didn't see that in any discussions. I'm hoping that other CUV-NT owners could chime in about the PSUs they're using, perhaps there's a relatively cheap PSU that is known to work with it.

Edit: Measured after shorting the PS-ON to Ground without connecting it to a computer, all within 5% tolerances.