Core Clock, Memeory Clock, Shader Clock

I have a question about overclocking. It hase to do with the different clocks.
I have a 8700m gt. So I can adjust the Core Clock, Shader clock, and the memory clock. What do each of these clocks do? Which one of these make the most difference? Which clock do you start with first? Which one generates the most heat. My Shader and core clock are linked, or I can move them seperatly, should I keep them linked? I have played around with overclocking and got up to 5600 3dmark06 without the temp going over 71'C. I'd like to do it in a more scientific method.

 

Humm.... Was this a dumb question?

 

There are no dumb questions.
Core Clock would make the biggest differce also more heat. (More FPS)
Memory Clock just aid some to performance(Higher MHZ more bandwidth)
Shader clock (No clue).
Temps are looking good.

 

There has been a couple of threads in the last 4 days about the shader clocks. The people noticed that increasing the shader clock more than its linked value (which should be the 2*core clock) gives a boost in the 3Dmark benchmark. My guess is that, like the name implies, it will increase the shader capacity, so it should be a boost in shader intensive games (i.e. Bioshock). They used RivaTuner.

As for the temps, it is accepted in general that anything going above 85°C can be harmful for the GPU. And yes, GPU's can work at above 100°C, but you should take into account the thermal stress applied, that's why you should be wary with temps above 85°C.

I hope this can help.

 

Thank you! My goal is to overclock till my temp reaches 75'C. I have seen others running the shader clock high, but was not sure if there was a payoff to it. I've also seen high memory clocks 900+, I've only gone as high as 850.

 

What card do you have?

 

Remember that each card is unique in the sense of the limits you can overclock, some of them cannot go so high before artifacts occur.