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7870XT Crossfire Problem

post #1 of 6
Thread Starter 
Got a second 7870XT for Crossfire and now my PC takes a while longer to boot up (black screen after BIOS for 2-5 minutes before booting up normally). There is also buzzing coming from my case, can't tell where the problem lies but it sounds like it is coming from the CPU. Buzzing goes away with single card and while with crossfire, and starts up again when I start playing a game.

Update: Getting graphical spikes now where the buzzing momentarily stops for the spike and resumes with the graphics. These spikes only seem to happen when I'm watching a stream at the same time as playing a game, which didn't used to happen before on the single card.
Edited by Alkajak - 4/23/14 at 7:21pm
post #2 of 6
Have you tried the new (second) card individually and in each PCIE slot?
Should help narrow down what the problem actually is.
post #3 of 6
Thread Starter 
Yup, both work soundless in all PCI slots individually. Crossfire starts the whizzing.
post #4 of 6
Hmmm... Sure your PSU can handle two cards? Crossfire cable may be defective?
Just thinking off the top of my head here.
post #5 of 6
Thread Starter 
Quote:
Originally Posted by Tobe404 View Post

Hmmm... Sure your PSU can handle two cards? Crossfire cable may be defective?
Just thinking off the top of my head here.

I JUST purchased a brand new HX850, so I'm hoping the PSU isn't the case.. the Crossfire cable is something I found lying around, I didn't actually have a brand new one, but it was in the plastic and everything.
post #6 of 6
Any way that you can test the GPUs in another PC? To rule out the PSU being the problem.
Also might be worth borrowing another Crossfire cable off a friend to eliminate that being the issue.
Could possibly be a bad driver although I doubt it. What version are you on at the moment?
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