why does High Quality Denoise (kinda) shuts down my pc?

[CarlosMiguelKlein]

Hello folks,

Recently I've upgraded my pc, but kept my power supply (750w bronze) and it feeds a amd 5900x 132gb ram and a 4070ti.

All the online power supply calculators recommend me a 700w power supply so I should have 50w extra, but during Corona High Quality Denoise my pc SORT OF turns down, my keyboard and mouse and monitor turn off, but the fans and lights from the case keep on on normal speed.

I was having a problem prior to that with a more basic VGA and a new watercooler that led to poor airflow that made my ram sticks go over 90°C during render, so I solved it with heatsinks and a ram fan, and no problem with denoise here, now with the 4070 ti (and ram with ok temperature) my pc shuts down during high quality denoise stage, and only high quality, not during interactive or other denoise options. I want to fix that but I need to know, does High Quality Denoise takes more energy? Does not make sense to me, since it barely uses the VGA to eat up all the power with the 100% usage of the 5900x.... if not that what else?

[Aram Avetisyan]

Hi,

Corona High Quality denoising is memory and CPU intensive. My guess is that it either overheats at denoising stage or there is a memory fault.
Does the same happen with other denoisers, after a production render (non IR)?

I would advise checking the CPU temperatures (use simple tools like HWInfo to do this) and how the memory is behaving.

Also, do you have any kind of overclocking on your machine, both for CPU and memory? Overclocked memory profiles are known to cause crashes and/or system reset in CPU and memory intensive loads.

[Juraj]

You can't trust power calculations like that, they never account for transient spikes which can shut down both cheaper power supplies (because lower quality circuits) but high-end one as well (over-protective surge guard).
But it can also be temperature protection on the CPU, so monitoring the temps during IR is good idea (they can indeed go easily 20C higher than during rendering, 100perc. load utilization doesn't mean the same thing).

[CarlosMiguelKlein]

Hello Aram and Juraj, no overclocks in ram memory nor in CPU, cpu  temp max 70°C during render, and I "under"cloak the rams from 3200mhz to 2666mhz... The turn offs are exclusive to High Quality and doesn't work in other options of denoising.. Important to say that the rams were reaching over 90°C because they didn't have heatsink and the watercooler was pushing hot air to them.

I'm closer to belive it's in fact the Power Supply not delivering enough energy, since its wasn't shutting down like that with a less power consumig VGA. Just feels off that the VGA is barely in use during High Quality but I guess a new 1000w Power Supply should solve it.

[CarlosMiguelKlein]

Alright, think I figured it out! So PSU calculators recommend 633w, but mine is 750w right? Wrong, it's 80% of that, so I'm working with 600w, that's why on high demand like High Quality it turns off! (i think)

[Juraj]

Yeah CPU temps could be red herring often, non-faulty CPU should down-clock, not shut-down. Memory is different thing, that one can crash with overheat, but it would give you BSOD most likely, not clean shut-off.