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7870/7850 crossfire woes

post #1 of 16
Thread Starter 
just bought a 7870 to go along with my 7870.

googled around and saw most people can add a second card for crossfire without adding drivers, but when I did, my 3DMark score dropped 3000 points. Reinstalled the drivers, enabled crossfire again, and lost 100 points in 3DMark.

Open up BF4, and as soon as the game starts to load a map, I crash with a "Battlefield 4 has failed to respond" or whatever.

If I disable Crossfire I can play BF4 fine and my 3DMark score stays within 100-200 points of the Crossfire score.

Yes, I have the bridge installed, yes the power cable is hooked up.

Someone suggested to synchronize clocks, disable ULPS and force contrast voltage and it didn't help. Tried 13.12 drivers and 14.2 and same exact issue.

Buh?
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post #2 of 16
Are they both made by the same manufacturer?
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post #3 of 16
Thread Starter 
Sapphire and HIS. Doesn't matter if the brand matches, AFAIK.

This time I got the game to load and go to the spawn screen. Only was getting about 12FPS though and after about 15 seconds it crashed and said blah blah blah make sure your video card has at least 512MB of RAM etc etc

Tried updating DirectX and it said I already had the newest version mad.gif
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post #4 of 16
What about ocing your cpu?or try changing to windows8.1 BUT before check gpu usage while gaming

Which is your resolution?what happen if you do a clean install of windows?
post #5 of 16
You tried the new card by itself?
post #6 of 16
Thread Starter 
Why would I OC my CPU? 4.6 is plenty and even if I was at stock I shouldn't crash seconds after clicking BF4.exe. 1920x1080 is my res though.

Tested the card by itself already in a separate rig.
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post #7 of 16
I didnt see the frecuency I am at the phone
post #8 of 16
Thread Starter 
Skyrim and CS:GO (only games I have installed right now) work fine too btw. Skyrim never ran my 7870 very hard both both cards bounce between 30-70% usage and my FPS is almost double from the single card setup.

CS:GO I always got 200+ FPS anyway so it's card to tell if it's working (both cards at 25% usage) but no crashes.
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post #9 of 16
There is a bottleneck/throttling somewhere,which are your gpu`s vrm temperatute and your gpu temperature?is any of your cards oced?if so did you increase the power limit?

Or you are not playing a gpu demanding games,can you test any fps?
post #10 of 16
Thread Starter 
Temps are fine across the board but why would that make one game crash?
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