Huge ammount of GPU Memory Errors. Blank screen. Single tone. PC not responsive

Hitman

New Member
I have a problem with my PC. While playing, it crashes: screen goes blank, a single tone plays, i can only hard rest.
Using HWInfo (great app, btw :D) i logged the status every second and found that there is a huge number of GPU errors in the last 1-2 rows of the log. The number is in the order of millions). What should I look at? 
I have a brand new GIGABYTE Radeon™ RX 480 G1 Gaming, 8GB GDDR5, 256-bit, but i got a similar crash on my old ati radeon
 
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