I don't think power is the problem.
At one point I had 1000w powering the computer plus 2 cards. 3rd card powered by 700w and 4th powered by 650. Now I have 1000w and that should be fine.
I think if it was a power problem it should freeze and not give this error.

If I wanted to explore it more, I'd go for linux and see if the drivers over there work better.
I'm returning my 4th card today. I tried alot. I'll be happy to share my experiences.

I don't think anyone is running 4x6950. Prove me wrong if you are.

Like many, I have been trying to get 4 x 6950 running. I suspect that it's just not possible with this card.
My thread:
http://forum.bitcoin.org/index.php?topic=20758.0

I also run Windows 7 64 with MSI 890FXA-GD70 mother board, AMD Athlon II X2 260 Regor 3.2GHz 2 GB mem.
and 4x XFX HD-695X-ZNFC Radeon HD 6950 1GB 256-bit GDDR5

I think the windows drivers are just not supporting 4x6950. Would Linux work better? Someone in the hardware comparison has made it work??? (I think it's removed from the list)

I got 4 cards working(1.3Gh), but I get "unable to initiate display wrapper" when opening msi afterburner. As a result, I can't control the fans even with other software, and the cards heat up way too much.
What is that error? I think it's related to the drivers but updating drivers does not help.

So, has anyone succeeded with the quad 6950 setup or shall we just build 3x6950 rigs? (or use other cards)

Okay..

So far I haven't been able to resolve the "unable to initiate the display wrapper problem".
These cards also heat like crazy.

Right now I have the rig set up with three cards, each spaced out so the air circulates and keeps the cards cool.
This set up works, but it's a bit disappointing to not have 4 cards running.

Does anyone have experience getting 4 6950 cards running without the display wrapper problem and without heating problems?

I haven't played with the bioses etc. but I don't think it'll help this one. Ideas?

Mining hardware comparison shows someone running 4x6950, but most of others like this video give me the impression that in general 4x6950 cards are not done.
http://www.youtube.com/watch?v=pk3FEYkCvJE

Any ideas on how to resolve this problem and run 4 cards?
I already decided to return the 4th card, but if I hear from you now, I'll keep it and make it work.

Hey,

I'd like to be whitelisted and allowed on the other forums. Main reason is that I believe this post should be in the mining forum instead of newbies.
http://forum.bitcoin.org/index.php?topic=20758.0

There is a discussion similar to my thread that I'd like to participate in:
http://forum.bitcoin.org/index.php?topic=7341.0


Thanks.
AD

This is Arrow Dynamic!

And I just posted my first post:
http://forum.bitcoin.org/index.php?topic=20758.0

I was hoping to post it in the mining section, but newbie I am to this forum.

Cheers!
AD

I built mining rig with 4 x XFX Radeon 6950 (crossfire x3) (black, one fan each).
With 3 cards it runs problem free and very stable.

When I put the 4th card in, MSI afterburner or Sapphire Trixx do not start. I get the error "Unable to initialize display driver wrapper". Crossfire and guiminer works fine, but I can't control all 4 fans in the cards. I have reinstalled drivers and hotfixes etc. Can this be a windows 7 update problem?
I have 1000W power supply so that should not be a problem.

I have noticed similar trouble with this card:
http://forum.bitcoin.org/index.php?topic=7341.0

However, someone seems to be running 4x6950 fine according to the hardware comparison:
https://en.bitcoin.it/wiki/Mining_hardware_comparison

My question is:
Is it possible to mine with 4 6950 cards or should I return the 4th card?

All comments and suggestions are highly appreciated!
Arrow Dynamic