Evga 970 overclocking

[jollypirate]

I was overclocking my gtx 970 ( EVGA sc acx) and i was runing it stably at 1497-1504 mhz with power limit at 110% and 74C (fans at 25%) so i started to oc the memory and i got to a 100mhz overclock and lef it runing for a minute. I didn see any artifacts or other glitching then my screen suddeny went blank and said its going into power saving mode, the computer was still runing. I turned of the pc by pressing the physical power button and turned it on again (boot took a bit longer than usual). Does anyone know why this happend?
I have a XFX Pro 650w semi modular so power shouldnt be a problem
I was overclocking by runing heaven benchmark and precision x over it and slightly increasing clocks at a time and leaving it a bit to see if it was stable.

 

[Vellinious]

That's....really odd. How old is your PSU?

 

[jollypirate]

The psu almost new, I got it in march, i tried overclocking it a bit when i got the psu and it did the same thing, newer really got into it though because back then my cpu was the limiting factor.
Rght now i got it stable at +86 on core and +449 on memory without any of the preformance cap green line in gpu z.I can get the memory to +550 before artifacts start apearing but if i get it so high i cant overclock the core because of the power limit

 

[Vellinious]

The psu almost new, I got it in march, i tried overclocking it a bit when i got the psu and it did the same thing, newer really got into it though because back then my cpu was the limiting factor.
Rght now i got it stable at +86 on core and +449 on memory without any of the preformance cap green line in gpu z.I can get the memory to +550 before artifacts start apearing but if i get it so high i cant overclock the core because of the power limit

Yeah, it's a balancing act with the stock bios. 187 watts is pretty limiting, but....at those clocks, your card should perform very well.

As for the black screen thing....man, I'm just not sure what to tell you there. It doesn't do that at all when it's at stock clocks? Because, if it only does it when you start giving it some overclock, then I have to almost think it's the PSU, but it could be the GPU. Do you have a spare PSU you can try it with? Or maybe another system, or a friends rig you can try the GPU in?

 

[jollypirate]

I have a spare psu but its a very bad 600W one, i wouldnt dare trying to oc my system while connected to it and i dont know anyone else with the power supply i could try it on. The strange thing is yesterday this keep happening while i had a lower overclock than this and the power consumtion was lower.Maybe it was just Windows being on balanec instead of preformance settings. Thanks for all your help

 

[Vellinious]

Sure thing, any time.