if i overclock my gpu core clock 10%
then performance grow ~10% or not?

In theory, yes, but there are several potential pitfalls:
Presently some people are seeing the GPU downclock say to 400MHz or 100MHz when it cannot support the set clock speed/overclock.
Tasks can also fail, as a result of a non stable overclock.
There is the problem of recoverable errors, that actually slows performance down, or offsets it.
The GPU heats up more, requiring increased fan speed and noise.
Overclocking also reduces the life of a GPU, heats up other components, uses more energy and might push the PSU out of it's comfort zone.

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Hi Munkhtur,

I bet your GTX580 will successfuly handle a 10% OC in all regards without any of the failures listed. Sure your temps may go up a hair but not very much. As long as you are not overvolting by a great deal I doubt you would be substantively shortening the useful lifespan of your card.


Thanks,
Steve

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Thanks - Steve

uses more energy

And at the same time do more work. So unless you're pushing too hard (causing errors, as SK said) you're actually increasing the power efficiency of the system by overclocking the CPU. Just make sure you know what you're doing, observe what's happening and don't try to break the world record immediately ;)

BTW: lowering GPU voltage and keeping the clock speeds similar increases power efficiency even more. Both techniques are tapping into the same reserves the chip has, and the problems regarding instability are the same (except for the decrease in power draw).

MrS

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Scanning for our furry friends since Jan 2002

I just overclocked my old GTX 260 by 20%, and it does seem to be getting a comparable increase in output. I'm sad now that I never tried this earlier, since boosting the core/shaders/memory from 576/1242/1000 to 701/1512/1100 had very little impact on the heat output. It hits 70°C max under load with 50% fan. No errors yet, though it's only done a couple WU's so far.

Be aware that Nvidia cards have shader straps, ie shader clocks go up in distinct intervals rather than incrementally. I found this handy reference for the overclocking intervals on my card:

http://www.overclock.net/t/497620/howto-overclock-understand-nvidia-shader-straps

I don't know what the strapping for newer cards is, maybe someone else can help you with that.