hello, I seem to be having a problem with my crossfire. I have 2 HD 6870's. The main thing that happens is that crossfire will shut off by itself.
When this happens, the blower on the bottom card will often turn onto high and then cant be turned back down because CCC no longer sees the crossfire. The same thing has also happened a few times (with the blower turning to high and xfire turning off) by just bumping into the computer case. When the computer is in this state its also prone to crashing.
I have no idea what the problem is. I've tried updating drivers, putting in a new xfire bridge and even switching the cards around. This appeared to fix it but only in the short term. Recently tHe problem is back.
So far, removing one of the cards seems to be the only way to solve all problems.
Try to adjust the fan speed inside the Catalyst Control Center. You can do so by enabling manual fan speed controls in the overclocking segment within CCC.
It sounds like you are having power issues to the video cards. It's possible that your bridge isn't making solid connection, but I'm leaning towards the motherboard slots as the source of your issues. My advice would be to make sure every motherboard standoff is tightened properly, and ensure that the video cards are fully inserted and screwed down solidly, and see if that changes anything.
Oh I cant adjust the fan in ccc because when the card malfunctions ccc no longer recognizes that I have a second card installed.
And, ah ha! cool thanks for that nick. That actually makes a lot of sense seeing as how the problem can happen just by bumping into the computer.
So if this turns out to be only a mechanical issue with the electrical connectors thats a relief. Maybe the slot got worn out over time from having a heavy card sitting in it? I might be able to move the bottom card into one of the 8x slots if thats the case.
One other thing I had considered was my PSU. its a 920w which is a little overkill for what my system actually draws so I had wondered if it was having efficiency problems under load or if I needed a lower wattage PSU.
Either way looks like I'll be busting out my screwdriver. I should try to clean up the wiring anyway because there isn't a ton a space for wires behind the mobo in the case I have. This makes it so that the back panel is sorta pressure fit on. I have some spare power cables for the GPU's so I may try those as well.
I wont be able to get to it for a couple weeks (I have to leave home for a bit) but I'll post back to let everybody know if that fixed it.
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