Computer turns off when load drops

[Molot]

Hello. I have a problem I find weird. My PC is last-gen:

 

1. Gigabyte B550 AORUS PRO (rev. 1.0) *
2. AMD Ryzen 9 5900X
3. Asus x Noctua RTX 3070 OC
4. PSU Corsair RM750x 750W (CP-9020179-EU)  *
5. 2 * 16 = 32 GB RAM, G-Skill Ripjaws, 3600 Megatransfers *
6. Arctic liquid freezer II 280 without offset mount (I got one, I'll install during next maintenance)

* These are  2 or 3 months after their 2 years warranty.

 

Sometimes after a heavy task, like massive data compression or a session of Cyberpunk 2077, it shuts down. Fans are all at 100%, RGB reverts to Gigabyte orange color, power and reset buttons do not work. I need to reset using PSU switch. After reset, sometimes XMP doesn't work. Everything else in BIOS I have set to default so I can't tell if it's a total reset.

 

Temps are good, never seem to exceed 75°C on GPU or CPU. Only OC I have is the factory one on the GPU. So that's not it. And it never crashes under load, extremely rarely if I just switch it on and only browse Internet, but quite often, like twice a week after gaming. But it didn't crash this week, when I got back to good old Fallout 4 without mods, that is a light load for my hardware.

 

My suspects are PSU or motherboard. My friends suspect PSU more than motherboard and I would agree it looks like that, because both kinds of load, CPU and GPU, can cause it, and only CPU power delivery is on the motherboard. How do I proceed from here? I can afford to spend some money, especially if I'll take B2B financing option, but I cannot afford to waste too much money, and I really wouldn't want to buy new AM4 motherboard that's a dead end if that's not it. On the other hand, buying good, future-proof PSU if my current one is OK-ish, is also not what I want to do... Please advise.

 

 

[191x7]

Corsair 750W is a broad term, it can be a bad one and it can be a great one, can you be more specific about the model?

 

Do you use the latest Bios on the motherboard and the latest chipset driver from AMD?

 

Some of the parts you mention have 3 years of warranty or even longer.

 

 

[Molot]

25 minutes ago, 191x7 said:

Corsair 750W is a broad term

It's a Corsair RM750x 750W (CP-9020179-EU) specifically, question updated. I use newest BIOS and drivers.

Edit: I see they claim 10 years warranty now. I don't recall it to be that way when I bought. I'll contact Corsair about it and see if they can help.

[191x7]

1 hour ago, Molot said:

It's a Corsair RM750x 750W (CP-9020179-EU) specifically, question updated. I use newest BIOS and drivers.

Edit: I see they claim 10 years warranty now. I don't recall it to be that way when I bought. I'll contact Corsair about it and see if they can help.

RMx always had at least 5 years warranty, so it could be 5, 7 or 10. RMx 2017 PSU-s are decent quality.

 

I see the 3070 Noctua having 2 bios versions, is yours the latest?

[Molot]

40 minutes ago, 191x7 said:

I see the 3070 Noctua having 2 bios versions, is yours the latest?

Where do you see it? And how do I find mine? By the way, OC Edition and non-OC one have to have different bioses, right? And I have OC one.

[Molot]

Just to let you know, Corsair & the seller refunded me. So this was a PSU malfunction at the very least. Now I need to buy another PSU and test all the other parts. Thank you all for your support!