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how to OC with xfire?

post #1 of 5
Thread Starter 
kinda curious how everyone does it, do you do 1 card at a time and just use the highest value of the weaker card? or do you OC both at the same time? what programs do people use? MSI afterburner is sucking for me, it will only overclock 1 card at a time and when i switch to the other card it sets the the other as stock values.... and yes i did the synchronize gpus and disable ulps blah blah blah.... i have 2 sapphire 5870's with asus bios' and i know the cards can go higher than where they are set right now but im not sure what program i should use in order to increase the voltage
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post #2 of 5
Bump. I'd like to know this as well, since I'll be xfiring my 5850 soon
 
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post #3 of 5
Yep. MSI afterburner sure do suck when overclocking it with crossfire. Honestly, the best method of overclocking in crossfire is to use CCC. To do so, you will need to achieve two things: 1) Increase CCC OC limits. 2) Have a means to increase voltage if required.

I only have experience in overclocking my 6950s - so I am not sure if it will apply to your 5870. There are a few means to increase CCC limits - one of them is to use ASUS Smart Doctor. You will need to flash your card with ASUS BIOS. I do not know if Saphire Trixx will do the same - I am guessing it will. For 6950s, there is a registry hack that you can do to increase CCC limit and hence does not require you to flash with a different bios. I do not know if it will work for other cards.
To increase voltages, you can use Radeon Bios Editor (RBE). It will not give you voltage control on the fly like MSI AB thus, but it will let you set your voltages in BIOS.
Hoping someone with experience with 5870 will chime in. The 6950s are my first AMD cards - and I had to do quite a bit of research and experimenting before I was able to overclock both cards.
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post #4 of 5
Quote:
Originally Posted by Awaz View Post
Yep. MSI afterburner sure do suck when overclocking it with crossfire.
Works fine with my crossfire and I can even exceed the original max. OC with MSI Afterburner.
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post #5 of 5
Quote:
Originally Posted by AMOCO View Post
Works fine with my crossfire and I can even exceed the original max. OC with MSI Afterburner.
what version of MSI AB are you using? I had the following two issues:

1) When you have sync GPU button checked, it will overclock both cards. But on computer restart, only one the GPU you selected in MSI AB as master will have OC applied, the other will go down to what CCC has (which will be stock). The only way to make OC stick to both is to uncheck the sync box and OC each card individually in MSI AB.

2) The second GPU will be at 100% load at computer restart. The only way to bring it down to idle clock is to start and then stop kombustor or any 3D graphics application.

So very interested to know what you did to get past those problems? Can you check to make sure both your cards are running with OC clocks?
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