Problems with hd 5870

[old pc gamer]

Hey guys . I've got a problem . Me and my friend decided to have a pc build contest with parts that are somewhere around 2010 -2011 and we can use only one part that is ours . I choosed the gpu because it was good ( hd 5870 . I upgraded to gtx 1060 6gb ) now after the pc was done we started a few things like web browsing , benchmarks ( unigine heaven for 1 hour ) and a few games . My pc didn't had a issue but when it came to pc gaming , we started with far cry 3 , skyrim , world of warships , war thunder and verdun . Now the problems starts . My gpu fan goes to 100% and monitor looses signal . I was a bit worried because it was taken of from my main pc just a week ago . I placed back in my main pc and it does the same . Tried reseating , older drivers ( both crimson and catalyst ) and the same occurs . Temps are really ok ( 38-40 idle and 63 at max until it crashed , but in benchmark went to 86 and was good ) And the card isn't overclocked
Thank you for help and sorry if i did any mistakes

PC Specs :
CPU: core 2 quad
GPU: radeon hd 5870
HDD: wd black 320 gb
RAM: 8 gb ddr 2 800 mhz
MOBO: Foxconn q45m
PSU: intex 600 w

 

[Lutfij]

I'm looking at the culprit right now! It's your PSU. Try and build your system with a more reliable unit and then see if the GPU is back to functionality. I'm already suspecting that it might've been damaged.

 

[old pc gamer]

I will try as soon as posible . But in my main pc ( corsair cx750 ) does the same . And i think my psu is pretty good

 

[old pc gamer]

Well i tried a sketchy thing and now it works like a charm . Idk why in my main sistem with psu corsair cx 750 dosen't work but in the sketchy build i added a separate psu for gpu and it does the damn trick . Been playing skyrim for 10 mins with enb mod and nothing hapened . Ty for your answer
. You helped me a lot today