M860ETU instability signs?

i recently do some overclocking to my 260m , do some research and i think that as long temps doesnt go too high after overclock then it is fine...

so...i tried using nvidia overclocking tools...and set the clocks to 600/925/1500
and play mass effect for 1-2 hours...

but after i tried going up to 610/950/1525 , the game hangs for a moment..like 30-50 seconds ... and then continues to run....is that sign that my GPU is unstable on those clocks?
im not sure is the the memory clock too high or core+shader is too high

and also , is there any ways to know the instability of the overclocked GPU?

 

Core and shader are not too high. So it should be the memory. The way of telling are when you notice the game does not run as smooth as it used to, like this case
Are you running stock voltages? That could be the reason too.

 

i dont wish to increase the voltages...just want to push the clocks to the limit at the default voltages....

by the way...should i increase the core and shader in proportion of 1:2.5?
saw this somewhere in forum....

 

1:2.5 are the usual proportion, yes.

If you don`t want to increase the voltage, you should lower the memory and try again till it`s stable.

 

I was under the impression that voltages are not related to performance... so increasing the voltage wouldn't help you get to higher clocks... or would it?
Feel free to prove me wrong.

 

That is correct. Voltages do not affect performance. If you were to run a card at 500/1250/800 @ 1v and raise the voltage so that it runs at 500/1250/800 @ 1.05v, their performance in any application will be identical, but the latter setup will have a greater heat output. However, the higher voltage will allow the card to scale to higher clocks while maintaining stability under high temperatures.

For example, if a card were overclocked to 600/1500/900 @ 1v, it would be stable up to say 80*C before it starts artifacting. If the voltage is raised to 1.05v, then that card would remain stable up to say 90*C before it starts artifacting. This means that we have more temperature leeway for overclocking and we can push the clocks higher until the GPU either starts to hit the temperature danger zone of 88*C, or starts to artifact at a temperature lower than 88*C.

I believe your confusion here is from the association of overclocking with overvolting at the same time as opposed to leaving overclocking out of the picture and just looking at overvolting as the sole variable.

 

ah...yea..i got artifact after my gpu hits 80c...
i think thats the cause..lack of voltage