Quote from: bluefirecorp on July 14, 2011, 03:32:22 AM

Quote from: mike678 on July 14, 2011, 03:26:02 AM

Quote from: asher2 on July 14, 2011, 02:46:20 AM

Quote from: mike678 on July 13, 2011, 07:10:04 PM

This might not be causing the problem but what power supply are you using? I looked up the watt usage for a 6950 and its 312 at full stress which x5 is 1,560 watts and that doesn't include the mobo hd ect.

Silverstone Strider Gold 1200W. I have plenty of headroom. Also, the miners crash when I try to start them when there is 0 load.

I'm kinda confused how do you plan to run 5 6950's off a 1200 w power supply if when they are mining each card runs at 312 watts? I may have that number wrong but I looked it up here:
http://www.guru3d.com/article/radeon-6950-6970-review/11

Does it crash the moment you start mining with one card or when your mining with 4 cards and you begin mining the 5th?

You do have that number wrong. 312 watts would be for that entire system.

I believe a 6950 requires 2x 6 pin slots. Each 6 pins pulls 75 watts max. The motherboard may also pull another 15 watts per card. That's 165 watts PER card times 5 cards. 825 watts, say a 125 watt CPU and another 100 watts for other stuff (multiple hdds/whatever), still under 1200 limits.

The problem does seem to be windows, have you tried in linux? I think LinuxCoin would be helpful in this situation (live, already ready for a test).

~bluefirecorp

This is not entirely correct either. Each 6 pin can deliver much more than 75 watts (although 75 watts is the recommended maximum) and often does under high overclocks. But you are in saying that 5 cards would be easily handled by the PSU. I agree that you should test it with Linux (just run LinuxCoin) to be sure that its a software issue.