Core clock or Mem speed?

[WhosThis]

So my GPU seems to like either one but not both at a time.

I got G1 gaming GTX 970 with the bios from GTX970 thread. 

 

If i go core clock i can get it up to +170 with 100% stable in valley bench and firestrike or

I can have mem +750 stable. 

 

But as soon as i start to push both of them together it gets unstable. 

 

So which one would be better? 

[Glenwing]

So my GPU seems to like either one but not both at a time.

I got G1 gaming GTX 970 with the bios from GTX970 thread. 

 

If i go core clock i can get it up to +170 with 100% stable in valley bench and firestrike or

I can have mem +750 stable. 

 

But as soon as i start to push both of them together it gets unstable. 

 

So which one would be better? 

 

Is there some reason you can't test each one and see which actually gives you better results?

[WhosThis]

Is there some reason you can't test each one and see which actually gives you better results?

in benchmarks they both seem to give about the same boost. was wondering in a long term ( stress and temperature wise) 

 

and   from my previous exp games tend to react different than benchmarks ( getting  10 fps more in valley doesnt result 10 fps increase in  CS3 for me.