LTC mining question

[altoz]

I have 3 6950's mining litecoin using cgminer. 2 of them get around 400 KH/s. The third one gets only 80 KH/s. How do I get the third one to get 400?

[wmikrut]

I have 3 6950's mining litecoin using cgminer. 2 of them get around 400 KH/s. The third one gets only 80 KH/s. How do I get the third one to get 400?

If all three are in the same machine, make sure your PSU is sufficient for all three cards.

[altoz]

I'm using a 1050W power supply so I don't think the power is a problem.

[temor]

I also had problems with my 6950's doing really low hashrates. I had to switch places with two cards and reinstall the drivers for it to work

[flyingmonkeycrap]

did you make sure of the simple things like clock speeds are all the same for each card and all have intensity 18? What is your thread concurrency?

[altoz]

Intensities are all at 15.
Thread concurrencies are at 8192.

I'm running a monitor off of one of them through the DVI port.

[altoz]

SOLVED
Steps:

1. I uninstalled the AMD drivers/programs/anything related.
2. I uninstalled the microsoft things (some redistributable and .Net stuff)
3. I installed the driver
4. I installed the SDK

Now all three are getting good speeds.