GPU OC'ing too much

[UnknownEngineer]

Title says almost all, when I OC my GTX 970's core, it actually goes higher than I want, I think it is making my OC unnecessarily unstable because of that.

 

DETAILS:

I am using Gigabyte OC guru II for OC'ing. In the program I had set my core to +171Mhz, with that I was supposed to get EXACTLY 1500Mhz on the core. But I will actually get 2 different frequencies, depending on my voltage setting.

 

1. While only adjusting the offset MIN (raised by 0.0125V) on my core voltage I noticed that my monitoring program was reporting a speed of 1550MHz, 50Mhz more that intended. And so, while I was playing Warframe my game crashed, screen blinked black and I was returned to my desktop, unable to maximize the game window, I could still hear the games sounds, as if I was mousing over menu items.

2. While using Offset max (raised by 0.0625V) I noticed that my core was at 1575Mhz, even more this time... Bf4 crashed after ~40 minutes, the same way warframe did, after hastily relaunching the game to continue playing with my friend I noticed the the core stayed at 1385Mhz, after that I was able to play for 2 hours or so without crashing.

 

Why is the core speed so unpredictable? I just want it to stay at the speed I tell it to stay at.

Also I could appreciate some other advice on OC'in my card, I am sure I could have use for that too.

[brokencross]

Use Afterburner.

[UnknownEngineer]

Use Afterburner.

I tried using that with my 7950, I didn't like it too much, overly complex and I couldn't get the overlay to work at all.

aand shortly after the fact I filed for an RMA on my 7950....

 

EDIT: i might give it another chance, hoping that it has had some updates.