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7870XT Crossfire Problem

Tags:
  • Boot
  • Crossfire
  • Graphics
Last response: in Graphics & Displays
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April 23, 2014 7:00:01 PM

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.

More about : 7870xt crossfire problem

April 23, 2014 7:13:36 PM

What make/model PSU are you using to power the 2 7870XTs?
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April 23, 2014 7:17:42 PM

Newly purchased HX850 just for the purpose of crossfiring.

Update: Also getting graphical spikes now where the buzzing momentarily stops on the spikes. 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.
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April 23, 2014 7:56:34 PM

When you remove the new 7870XT (the second one), does the sound go away?

If you remove the original 7870XT and install the new one, does the sound come back?
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April 23, 2014 8:03:31 PM

The sound only exists during crossfire. I've tested both cards in both PCI slots individually.
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April 23, 2014 8:05:40 PM

How are your operating temperatures of both 7870XTs at idle and under load? Same for your CPU?

Also, what are the specs for the rest of your system?
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April 23, 2014 8:24:33 PM

GPU is 62C max during gaming.
CPU is 50C max during gaming.

2500K @stock
212 Hyper EVO
HX850
P8P67 Deluxe

Buzzing also only happens in game. When I tab out of the game to my browser, the buzzing stops immediately.
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