GPU freezing pc after closing furmark (when GPU is on high load and the screen changing fast.)

[cesko]

Hello!

I have problem with my AMD radeon 7970 GPU. Every time when i try to test my gpu with furmark for 5-10 mins and i click on X button (closing furmark) my pc freezes. No Bluescreen, just simple freeze.. and it's happen when i playing games like PUBG, opening doors, checking inventory, goin to settings menu, so every time when GPU is on high load and the screen changing fast. Temps okay: Its hit 70celsius on 100%load with a accelero xtreme 280x cooler.

What i tried:

Software:
Tested on win7
Tested on win8.1
Tested on win10
Tested with AMD official driver
Tested with windows installed driver
Tested with the original GPU bios because i noticed somebody installed another one.
Tested with Upgraded Mobo bios
Tried to get some info from Windows event viewer but its show nothing happened.

Hardware:
Tested with other RAMs
Tested on Cheftec APS650SB and Corsair cx600 PSU
Tested with a HD7870 GPU and with this gpu everything was fine.
Tested in a another PC, i has the same problem.

My PC:

CPU: FX8350
GPU: AMD Radeon 7970
RAM: 2x 8gb Hyperx Fury 1600mhz
MOBO: Asrock 980DE3/U3S3 with 2.0 bios
PSU: Corsair CX600

I have no idea whats the problem with my GPU, pls help my find out. (Any tip can help)

Thanks for the answers and sorry for my bad english.
 

[MizuNano]

Try to check the temp of your gpu

[cesko]

1 minute ago, MizuNano said:

Try to check the temp of your gpu

I already checked. Temp never go over 70-71 Celsius, I tested with furmark (45 min run)

[MizuNano]

Ok. So next step is. Remove your gpu and try checking again, if it freeze. Check the temp of north brigde. Maybe that will be the problem

[cesko]

53 minutes ago, MizuNano said:

Ok. So next step is. Remove your gpu and try checking again, if it freeze. Check the temp of north brigde. Maybe that will be the problem

I removed my gpu, but i still have a problem, me pc freezed again and i found something on the log file:

 

A Fatal Hardware Error Has Occured

Component: AMD Northbridge

Error Source: Machine Check Exception

Error Type: HyperTransport Watchdog Timeout Error

Processor APIC ID: 0

[MizuNano]

Yep, as i said northbridge problem. Try to put a fan on the northbridge and reset your bios. And recheck again

[MizuNano]

If the problem persist, try buying a new board