I have a xfx 6950 2gb and a visiontec 6950 1gb problem is when i enable crossfirex as soon as bf3 goes to full screen I get blue screen.

first thing i was wondering is i noticed the mobo spec tell me that the 2nd pcie 16x slot only runs at 8x when linked M4A78t-E

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Yes with the M4A78T-E mobo when you use the second pcie slot both will run at 8X.

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PhenomII 1100T// Asus Sabertooth R2.0 // 2X HD5850 CF //8Gb of 1866Mhz ram, H50 cooling, HX850W psu all stuffed into a NZXT Phantom case.


Was a member of AMD Processer forum since 2008. Last post count 1818.

could be the cards being different makers,bioses and 1G vs 2G causing issues.thats why when I do crossfire,I buy 2 identical cards(in my current 6950 dirt 3's,they are even sequential serial #'s)

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AMD Phenom II 1100t @4.0Ghz /Asus sabertooth 990fx/2-sapphire 2G 6950 dirt 3 edition cards(shaders unlocked,880/1375)/160G intel ssd/16G G-Skill Ripjaw 1600/2-samsung 24" monitors 1920X1200/Corsair AX1200W psu/W7 pro 64,G19/G7 keyboard&mouse,Cooler master HAF932,corsair H100 water cooler,Zalman ram cooler.Sound Blaster X-Fi Titanium Fatal1ty Champion Series,Logitech Z5500 speakers,Roccat Kave 5.1 headset.

 

can't see that causing BSOD though, I've ran three diffrent makes of 4870's and even had them at diffrent clockspeed to each other with no problems

More likly the second card is failing

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PhenomII 1100T// Asus Sabertooth R2.0 // 2X HD5850 CF //8Gb of 1866Mhz ram, H50 cooling, HX850W psu all stuffed into a NZXT Phantom case.


Was a member of AMD Processer forum since 2008. Last post count 1818.