Overclocking GTX 970 unigine heaven problem

[wicked_sticky]

Im trying to test my GTC 970's oc for stability, I've used Asus Overdrive, MSI After Burner, EVGA precision all with the same issue, the boost on the overclock works fine in games (set to a modest 1400mhz), but when I run unigine heaven it runs at at ~1555, which causes artifacts. Does anyone know what gives, i just want to find what speed Im stable at... unigine heaven isnt doing the trick but I cant find any mention of anyone else with this issue

 

[cdabc123]

sure the clock it shows for me in that benchmark is higher then i set my gpu at. i dont know if that program fails to recognize the core or if it farther overclock it to prove stability.