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Overclocking Crossfire 6950s

post #1 of 3
Thread Starter 
Hello! I'm new to this site so please tell me if this is in the wrong section or I'm doing something wrong. Anyways, I have 2 Sapphire 6950s in crossfire and I'm trying to overclock them. After looking though guides and such, I attempted overclocking my crossfire 6950s using Afterburner. However after testing for stability with Unigine Heaven and 3Dmark 11, my drivers kept crashing or my computer would freeze. I was not sure what I was doing wrong so I took one card out and tried overclocking one of the cards. I was able to reach 900/1375 clock for the core/memory. I tested and my system was perfectly stable. By the way the shaders are unlocked on both cards. I'm not sure what's wrong and any help or advice is appreciated. Below is my build.

CPU- i7-2600k @ 4.4ghz
mobo- Gigabyte z68xp-ud4
GPU- Sapphire 6950 Flex editon/ Sapphire 6950 Dirt3 editon (crossfire)
PSU- OCZ 750w Fa1alty series
Memory- Corsair low profile 16gb
Cooler- Corsair H60
post #2 of 3
It's possible the driver crashing and computer freezing would actually be because your overclock is too high. Just because one of your cards can reach a higher overclock doesn't guarantee they both can, and they both need to be stable for an overclocked crossfire setup. I could be way off though.
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The War Machine
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post #3 of 3
How high were you tryn to go when they crashed?

Did you try to OC each card separately?
Project Haswell.
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Project Haswell.
(17 items)
 
  
CPUMotherboardGraphicsRAM
i7-4770k Asus Maximus VI Hero EVGA 980ti FTW G.Skill Trident X 2400Mhz 
Hard DriveHard DriveCoolingCooling
Samsung 840 pro Samsung Spinpoint F3 1TB Raystorm Block RX360 Extreme, RS 240 
CoolingOSMonitorKeyboard
Pump D5 Vario  Windows 10 Pro Q-nix 1440p Logitech G-710 
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