Driver crash? 1BTC Reward offered for solution [solved]

[asher2]

Issue: guiminer crashes on start when 5 GPUs (6950s) are present. It works with 1-4.

Drivers have been swept and reinstalled. GPUs have been changed out. The GPUs don't matter, the slots they are plugged into don't matter, its just the number.

The crash occurs with other polcbm miners and with phoenix.

1BTC reward offered to anyone who can resolve this for me. I'd like to get the 5th card working and add my 6th asap.

Board is a 890FXA-GD70, cards are on x1 risers (3 are powered). All have been tested independently.

Thanks all.

Problem signature:
  Problem Event Name:  BEX
  Application Name:  guiminer.exe
  Application Version:  0.0.0.0
  Application Timestamp:  4918019c
  Fault Module Name:  aticaldd.dll
  Fault Module Version:  6.14.10.1417
  Fault Module Timestamp:  4ddc6ce6
  Exception Offset:  00014d4c
  Exception Code:  c0000409
  Exception Data:  00000000
  OS Version:  6.1.7600.2.0.0.256.48
  Locale ID:  3081
  Additional Information 1:  60d4
  Additional Information 2:  60d4b202377079ddc0cdb88488f5cf13
  Additional Information 3:  02a3
  Additional Information 4:  02a3ff522d141ac161ab19af6bc7b9ba

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[mike678]

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.

[drawoc]

Also, what version of the Stream SDK are you using? I believe some of the older versions had a limit of 4 GPUs on Windows.

[asher2]

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.

[asher2]

Also, what version of the Stream SDK are you using? I believe some of the older versions had a limit of 4 GPUs on Windows.

I'm using the latest.

[mike678]

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?

[bluefirecorp]

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

[FreeJAC]

There is a driver hotfix here not that it specifically deals with your issue.
http://support.amd.com/us/kbarticles/Pages/AMDCatalyst116bHotfix.aspx

[sabe]

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.

[asher2]

I've got it sorted now guys.

To the questions above about power usage... im pulling 1280 at the wall running 6x 6950 at 800/300. My PSU is approx 87% efficient at this load.

I don't have a lot of headroom to OC unfortunately!

[prophetx]

do u recall what the resolution was? i have the same issue on 6950s