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No overclock when in Crossfire?

  • Thread starter Deleted member 93354
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Deleted member 93354

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I read several threads where people said you couldn't overclock AMD cards when running in crossfire.

Did anybody find the cause or know the reason?

I'm going to try crossfire this weekend and I was wondering if there was a way around this issue.
 
You can overclock in crossfire, although you will likely have to shoot for a lower overclock. You generally have to synchronize your cards to the same clock and voltage, so if one card is a golden chip and another isn't, you'll have to fall back on the clocks of your lower card.

Thats the tricky part, its much more difficult to find an OC sweet spot with dual gpus'...That said, I can easily get my CF7970 to 1125/1700 stable.
 
Yeah I had pretty good luck with my 7950 xfire setup, besides drivers. Also if you place the gpu that overclocks the best in the first slot you should get better overclocks. That was my case anyways at least. Good luck.
 
Trial and error, many errors! ;-)

I'm running 1100/1550 with my 3 cards but it took a lot of tweaking to find the right settings. One card needs a bit of voltage, 1 card does better if in the bottom slot so it runs a few degrees cooler, etc. Luckily my MOBO supports 3 cards at 16/8/8 PCIE 3.0 at tripple slot spacing.
 
You can still overclock, but the max o/c is usually lower compared to just 1 card. The process is still the same. D/L a o/c program like MSI Afterburner and go at it.
 
CFX 7970's here and I have no probs running CCC max OC at 1125/1575, +20% power.
 
I had no problem overclocking both of my 5850's in CF. I agree that moving your better video card (overclocking wise) to your first PCI x 16 slot tends to help. Using MSI afterburner or any program that synch's your overclocks at the same time also helps.
 
I have my 7970s at 1100 1500. But I only play Source games and mods so I really don't need more than my 6970s ....not even more than one. But the cfx works great in benchmarks.
 
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