Random Power Cycles issues

[AOD_Suisfonia]

This has only happened a couple times so far (well, the 4th time now, happened ten minutes ago) and has happened both before and after I got my new GPU back in April.

I've looked at the event viewer, even had my brother (Cursix) take a look, but nothing really shows up as telling us what the problem is. I don't know if its possible that it's my motherboard (considering the onboard Ethernet ports were bad) or if its my PSU.

I was hoping my motherboard would have a log I could view.

CPU: i9-7900x
Ram: 64gbs
GPU: 3090 RTX Ti
Motherboard: Prime X299-Deluxe

[AOD_DirtyApe777]

This could be a motherboard board or PSU issue. It sounds like your power cycle issue started happening after your GPU upgrade which makes me lean towards 2 things:
1. Your PSU cannot handle the load your GPU is drawing
2. You don't have the proper power connectors from the PSU to the GPU connected or fully seated and it's trying to draw all of that power from the PCI-E lanes, which cannot handle that, and it's causing the motherboard to kill power to save itself.

Only way to know for sure is to buy a PSU that can handle the power needs which would be 700 watts 80 plus gold or greater imo. Heck, I'd aim for a 850watt 80 plus gold at the bare minimum for overclocking breathing room and future expansion to add more SSD's or a more powerful GPU in a few years.

[AOD_Suisfonia]

Right now I'm at a 850w 80 plus gold, but I wonder if it wouldn't be a bad idea to juts upgrade that to a 1k. Problem is that in the past when I tried upgrading a PSU I ended up burning out a cable somehow (a 1amp cable) :(

[AOD_HOODedDutchman]

Does it so it under load or is it just random? Does it just instantly switch off and turn right back on? Also there's no such thing as a 3090ti. Doesn't really make a difference tho.

[AOD_Suisfonia]

Whoops, yea I mistyped on that. It's a RTX 3090 FTW3

As far as it cycling, I've monitored the load on my card and it isn't under any hard load. Heck, I ran a benchmark this morning on the GPU while I was out with family for eight hours and it was still running fine when I got home (temps were around 81c-85c, 100% fan speed) and no power cycling. I ran another benchmark on the CPU only two days ago and it was working fine to.

[AOD_HOODedDutchman]

Whoops, yea I mistyped on that. It's a RTX 3090 FTW3

As far as it cycling, I've monitored the load on my card and it isn't under any hard load. Heck, I ran a benchmark this morning on the GPU while I was out with family for eight hours and it was still running fine when I got home (temps were around 81c-85c, 100% fan speed) and no power cycling. I ran another benchmark on the CPU only two days ago and it was working fine to.

Do you get blue screens or does it just flick off and come right back on? If it's the latter could be a short or bad power supply. I had one fail before and it was completely random. Could be 5 minutes of browsing or 8 hours of gaming and it would just flick off and come right back on with no errors. Replaced it and gave it to a buddy who replaced a bad capacitor on it and used it in one of his builds lol.