Problems running 3+ GPUs (bounty)

[TheHarbinger]

Did you ever get this up and running?

[1714963483]

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[1714963483]

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[1714963483]

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[1714963483]

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[yochdog]

Did you ever get this up and running?

No, I have not had the time to work on it......have been setting up BFL singles and new GPU systems. 

I will circle back to the trouble systems once I move our operations into a new space. 

[yochdog]

I am still having issues.....I recently tried to get 4x 7970 working, but for whatever reason the 4th GPU is not getting recognized. 

Anyone with experience on this issue that wants to help would be greatly appreciated! 

[imsaguy]

I am still having issues.....I recently tried to get 4x 7970 working, but for whatever reason the 4th GPU is not getting recognized. 

Anyone with experience on this issue that wants to help would be greatly appreciated! 

I'll work on this for you right now and document the steps I'm going to take on a new rig.   I just bought 8 7970s and will be running them on Win7x64.

[yochdog]

I am still having issues.....I recently tried to get 4x 7970 working, but for whatever reason the 4th GPU is not getting recognized. 

Anyone with experience on this issue that wants to help would be greatly appreciated! 

I'll work on this for you right now and document the steps I'm going to take on a new rig.   I just bought 8 7970s and will be running them on Win7x64.

This would be fantastic......which 7970 did you buy? 

[zvs]

that surely points to the PSU then ?

What wattage is it ? have you got another one you can try ?

I doubt yochdog would underpower his rigs.

But the crashing is odd, I've had 6 on 1 rig before, all on extenders, and 1 on a PCI to PCIe adapter.

I'd be interested in what the BSOD says. 11.6 with SDK 2.5 should be stable.

I will try this.

The rig I am testing with has a 1200W PSU for 2x 5970, and whatever random card I throw in the 3rd slot.  I don't think power is the issue.  

i have 1200W PSU also, have you tried drawing some power off MB?

dark and hard to see, but





(yes it's dusty also)

[bitlane]

Use CAT 11.12. Using 12.x will only allow 4 cards/cores max, then blue screen on the 5th. I had the same problem with EVERY generation of card using Windows 7 x64 (as Windows 7 x32 only supports 4 cards/cores regardless).

I use 11.12 for EVERY rig, every Card generation (5/6/7xxx) and run up to 6 physical cards per rig without issues, yet 12.x on the same hardware = bluescreen with 4+ cards.
(SDK 2.1 for 5xxx Rigs, SDK 2.4 for 6xxx Rigs, SDK 2.6 for 7xxx rigs - Drivers always 11.12)

Do I get paid now ? (also, perhaps for the BAT file/shortcut help ?)

1EgNTCmAJmNy9KyBvAofExvNjmxwGVC7Nx


I always seen to miss out on the yochdog bounties .....LOL

Win7 x32 = 4 cards/cores regardless.
Win7 x64 = 8 cards/cores, must use CAT 11.12 (11.12-7970 Edition is available and I use it as well).

[-ck]

Go back to the PCIE latency advice, if the mobo BIOS supports it. It worked for me. Every mobo will have bandwidth issues at different numbers of GPUs, and mine had it at 4. More commonly it's at 5. Changing PCIE latency from 64 to 96 fixed it for me.

[NLA]

A mixture of good ideas and basic troubleshooting:

• Do a clean re-install of Windows. It could be that simple!
• If you don't want to re-install Windows, do a clean re-install of your drivers with ATIman, here: http://atiman.go-board.net/
• Your RAM might be bad. Run Memtest86+ overnight and make sure the RAM is alright. http://www.memtest.org/
• When you mine, do you mine one card at a time (for testing) or all at once? Instead of mining with all cards and causing BSoD, try mining with single cards at a time. See if the 3rd card alone causes the BSoD, or if the 5970's have something to do with it.
• Are you using a custom BIOS on any of your cards, by chance? Undervolting/overvolting? Underclocking/overclocking?
• Test the 3 cards you intend for this rig in a completely different rig, to make sure that the issue is definitely card related, and not related to motherboard, RAM, hard drive, or PSU.

[yochdog]

A mixture of good ideas and basic troubleshooting:

• Do a clean re-install of Windows. It could be that simple!
• If you don't want to re-install Windows, do a clean re-install of your drivers with ATIman, here: http://atiman.go-board.net/
• Your RAM might be bad. Run Memtest86+ overnight and make sure the RAM is alright. http://www.memtest.org/
• When you mine, do you mine one card at a time (for testing) or all at once? Instead of mining with all cards and causing BSoD, try mining with single cards at a time. See if the 3rd card alone causes the BSoD, or if the 5970's have something to do with it.
• Are you using a custom BIOS on any of your cards, by chance? Undervolting/overvolting? Underclocking/overclocking?
• Test the 3 cards you intend for this rig in a completely different rig, to make sure that the issue is definitely card related, and not related to motherboard, RAM, hard drive, or PSU.

Hey all

It turns out to have been a bad PCIe extender.

Now have 4x 7970's up and running perfectly happy.....no issues at all.