GPU shutsdown when reaching 75C

Oct 3, 2018
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Hi, i have a little problem with my GPU (Radeon RX 580 Sapphire Nitro + 8gb). I have a new rig and noticed that when my gpu reaches 75C (in games), i get no video signal on monitor, GPU fans are still running, ingame sound is still present but after some time it dies too, and my keyboard isn't responding either (followed keyboard leds "Capslock,numlock") and i just need to restart my pc and everything works. I Thought that my PSU can cause problems but if i increase fan speed (35 % in Msi afterburner) then i get 58C-63C and everything runs fine. In msi afterburner there is gpu temp limit and is set to 85C(default). Its like somewhere is set this 75C limit. Cpu is running fine btw <50C
My specs
Windows 10 64bits
Motherboard: Gigabyte AB350 gaming
RAM: 8gb HyperX
CPU: Ryzen 5 1500x
GPU: Sapphire RX 580 Nitro+ 8Gb
PSU: Deepcool DA 700W (650 on 12V rail)

P.S i know that my psu is low rated but i dont have acces to anything else here in my country and i dont thing that this thing is causing me problems because as i said, even when my gpu load is 100% but i speed up the fans so that i can keep my gpu below 65C everything runs fine.I can just keep this fan speed, but i'm just curious where this limit can be present
 
Oct 3, 2018
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well, technically speaking this card can push more. just like you said its a tempereture problem..if my psu ca keep with 100% gpu load when fans a running faster and temp goes down, i dont think its a psu problem in that case, could it be a bios setting on the gpu itself?!
 
Oct 3, 2018
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side panel is open, when gpu reaches 74 C, the GPU rpm is about 800, and when he reaches 75 its BOOM, no signal. I adjusted rpm on higher temps to be something like 1700 rpm and it runs below 63 and it works, no problems. So my question is if there is such a setting somewhere that limits my gpu to 75C . If i look at offcial sources, then this card can run at 80 and more without problems. I found in msi afterburner such setting but there is 85C limit