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How to overclock safely 6850 CF

post #1 of 4
Thread Starter 
Hey,
I'v been reading in this forum for some time, but this is my first post.
I own a pair of R6850 CF, and would like to overclock them.
This is my first attempt so I'm quite new with this stuff.
From all the posts I saw, I understood I should use MSI Afterburner for the task.

My question is how can I safely overclock my cards without making any damage by accident ? How can I know when temperatures are OK and when they are to high ? I would really be glad if someone could give me some tips about how to get started.

Thanks alot !
post #2 of 4
1) make sure you have a high quality power supply.

2) make sure that you have good case flow.

3) you will need to edit the cfg file in afterburner to unlock the unofficial overclocking hoopla.

You won't break them. Afterburner will only let you hit 1.3v, and that isn't enough to toast your HD 6850s, but you should be able to hit over 1000 core, and maybe 1200 memory.
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by damric View Post
1) make sure you have a high quality power supply.

2) make sure that you have good case flow.

3) you will need to edit the cfg file in afterburner to unlock the unofficial overclocking hoopla.

You won't break them. Afterburner will only let you hit 1.3v, and that isn't enough to toast your HD 6850s, but you should be able to hit over 1000 core, and maybe 1200 memory.
Thanks alot for your reply.
Should overclocking be done step by step ? Or straight aim for 1000 core and 1100-1200 mem ?
And one last thing, Say I overclocked to X core and Y mem, How can I test and see If temperatures and everything else is OK ? I guess I need to push the cards to their limit in order to find out ..

Thanks again !
post #4 of 4
Gonna re-post this here since I have similar questions and no one was replying to the other thread, only difference is I have 2 6870s in CFX

So I just got my second VGA Cooler and I'm ready to OC my 2 6870s but I have one question. Obviously all GPUs are not the same even if they are the same model so my question is for multi-GPU setup where it says "Before you begin make sure 'Synchronise settings for similar graphics processors' is ticked in the 'Settings' screen of MSI Afterburner." If no 2 cards are alike then why should some one with multi-GPU do this since one clock might work for one of my cards but might cause artifacts on another. Or am I missing something? And if it is the case that I have to clock them seperatly does that mean that I'm going to have to be un hooking them in the back and inside and what not to do one at a time? And if so should I do them sepperatly or does it compensate for them both being in crossfire?

Also when a safe Overclock is found doesent it stay overclocked always? Meaning you dont have to turn it on or anything when the computer loads up it should already be OC'd right?
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