7870XT Crossfire Problem

alkajak

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Nov 1, 2010
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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.
 

alkajak

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Nov 1, 2010
56
0
18,630
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.
 

alkajak

Distinguished
Nov 1, 2010
56
0
18,630
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.