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6950 crossfire Really Low clock rates on second card

Last response: in Graphics & Displays
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November 2, 2011 10:31:16 PM

Hello....my system is:

1055T CPU
Crossfire IV formula MB
2 x 6950 in crossfire onfig
4 x 2Gb DDR3 Ram
750Watt Corsair TX power supply

Seems fine but the second card only shows a GPU clock of 250Mhz and a Memory clock of 150Mhz reported by both CCC and GPU Z. Even if I try and increase them on the second card it doesn't change. Any idea why people? PSU not big enough?
November 3, 2011 3:27:33 AM

frontwave said:
Hello....my system is:

1055T CPU
Crossfire IV formula MB
2 x 6950 in crossfire onfig
4 x 2Gb DDR3 Ram
750Watt Corsair TX power supply

Seems fine but the second card only shows a GPU clock of 250Mhz and a Memory clock of 150Mhz reported by both CCC and GPU Z. Even if I try and increase them on the second card it doesn't change. Any idea why people? PSU not big enough?


Man, I have the EXACT same issue GPU clock is at 250 and Memory clock is at 150 and will NOT change. I have the 1100T CPU, Crosshair IV MB, 2 x 4Gb DDR3 and a Corsair TX850PSU. I just tried playing BFBC2 and the frame rate was all over the place going from 10 all the way to 200 but it was unplayable. I don't know if there is something we need to unlock in the MB BIOS?
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March 1, 2012 8:17:06 PM

I am having the exact same problem.
Frame rates avg at 12 in 3dMark11. No idea how to fix this, and I've been trying for a month.
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March 21, 2012 4:22:43 AM

Believe it or not, I added a second Crossfire Bridge and it seemed to stabilize it. I'm running the 12.2 drivers with the latest CAP profile and everything is running like it should now. The only thing with 12.2 - CCC will not allow me to increase the power control settings on my secondary card. If I try to increase it to +20%, the slider automatically snaps back to center. Not sure if it's a new feature or a glitch.
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