Games crashes and/or freezes without any error while running dual 7950s in Crossfire

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AznRice

AznRice

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Aug 26, 2011
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I recently added an XFX Radeon HD 7950 to my system so I can run 2 7950s in Crossfire. However, my Crossfire experience has been very poor. All the games that I run either crashes to desktop without any error or freezes so bad that I have to Ctrl+Alt+Del my way out of the game. I am currently using the latest AMD Catalyst driver 13.11 Beta 9.4

System Configuration:
Intel Core i5-3570K O/Ced to 4.6 GHZ
16 GB Kingston HyperX RAM
MSI Z77A-GD65 Motherboard
XFX Radeon HD 7950 DD
XFX Radeon HD 7950 BE (slightly higher clock speed)
Corsair HX750 PSU
NZXT Phantom 630 Case
Corsair Force GS 90 GB (Boot drive)
Seagate Barracuda 1 TB (Data)

This is what I did to troubleshoot this problem.

-Uninstalled graphics driver, removed traces of AMD driver in safe mode by Driver Fusion
-Tested each game with 1 graphics card at stock speed (Both GFX cards works fine)
-Disabled ULPS
-Installed the latest BIOS
-Changed XFire cable

None of these troubleshooting steps worked for me. What else am I supposed to do? I've looked at so many forums and none were successful. I do not want to replace every part yet. Thank you, I really appreciate it.
 
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iam2thecrowe

iam2thecrowe

Glorious
Jul 4, 2010
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what are the temperatures of the cards and the cpu? the extra load and heat of the new card could be making things unstable. remove the overclock on your cpu, the extra load on the cpu from the new graphics card could cause the overclock to be unstable.
try a clean windows install too, that often fixes a range of problems.
 
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AznRice

AznRice

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Aug 26, 2011
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According to GPU-Z, the top card is 36*C and the bottom card is 32*C idle with a minor overclock to test for stability. At 4.5 GHZ, my CPU is running at 33*C idle. My case has excellent airflow so there should be no reason why my graphics cards are overheating. I calculated the power supply load on Thermaltake and the requirement is good enough for a 750W.
 
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AznRice

AznRice

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Aug 26, 2011
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My bad, I ran prime95 for a while and the load temperature for my CPU averages 60*C. When I play games like BF4 or COD Ghost, my GPUs would average around 55*C. It's still acceptable in these temperatures.
 
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AlbusDlx

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Dec 25, 2011
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You can have 2 million watt PSU and yet have power restrictions. Depending on the cpu power connector, 4/8pin you get a certain ammount of watts on the motherboard (some boards also have an extra molex connector for exactly this purpose). Also, depending on the pci-e power connector (6/8pin), more or less power is drawn from the motherboard. I dont have the charts in my head. But there is a limit.

I have an 850w psu and the CPU overclock I could reach with 1 GPU was higher than with 2. At the time 2 HD 6870´s.
 
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AlbusDlx

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Dec 25, 2011
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I wanted to add something. Not saying this is the issue but it is something every pc builder should know. Putting it simple.
On a MB with 24+8 you have 225W to play with. 90 of those are dedicated to the CPU, so then you have 135W to play with. A gpu with 1x6-pin+1x8-pin: 25% from the MB, 75% from the PSU. So if the card is @ 200W TDP, times two=400W TDP, then 100W will be taken from the MB. Witch leaves you with 35W.

OC on that system and you are starting to cut it short. =)
 
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