PCI-E 1x riser issues (GPU fan surges and freeze on boot) 6 x 7970

[boozer]

I have the MSI 890FX-GD70 mobo running Linux (SDK 2.8 and Cat 13.1) and was trying to get 6 x 7970's up and running on it.  Well I did get 6 x 7970's up and mining for about an hour when I decided to tweak a single cards engine/memory speed for some better performance.  After sever tweaks, the computer froze.  Something gone wrong with tweak I thought... I'll just reboot.  I rebooted and it froze around where X would start    At the same time the GPU on the PCI-E 1x slot fan sounded like it was surging, going from idle to 100% and back... over and over again.  I unplugged the 1x slot and the rig booted fine.  I also moved the card in the 1x slot to a 16x slot and the card was fine.  I tried a different card in the 1x slot and computer froze.  So it must be an issue with the 1x slot or riser 

It is a powered 1x riser I made myself... I have two other 16x to 16x powered risers I made myself and they still work fine.  I would try another 1x riser but I dont have any (they are on order).  I have the A1 to B17 pin short in place in the 1x slot.  3 powered risers and 3 unpowered.

Anyone had any issues like this?

[fran2k]

Can you share the plans of the DIY risers?

[boozer]

Can you share the plans of the DIY risers?

This thread has links to several resources:

https://bitcointalk.org/index.php?topic=171620.0;topicseen

[boozer]

Just FYI:  I got my new risers in today and that fixed this problem.

[Wilderness]

Just FYI:  I got my new risers in today and that fixed this problem.

Boozer do you use powered risers for all the cards? Just wondering if I would need to get powered risers for the 16x16 risers in a 4 x 7970 rig or just the 1 x 16

Also can not having enough power from running unpowered adapters cause the machine to crash after being able to run for 10+ hours?

thannks

[rtgornik]

Just FYI:  I got my new risers in today and that fixed this problem.

Boozer do you use powered risers for all the cards? Just wondering if I would need to get powered risers for the 16x16 risers in a 4 x 7970 rig or just the 1 x 16

Also can not having enough power from running unpowered adapters cause the machine to crash after being able to run for 10+ hours?

thannks

I too am wondering this.

I cannot seem to be able to run 4 cards for more than ~6 hours at a time.

I am now running 2 cards for ~9 hours. I'm keeping my fingers crossed that they will go indefinitely.

The only thing I haven't tried is powered risers. I'm looking to create two of these today on my 1x risers where I'll add 1 card at a time with the new powered risers.

[Nutnut]

I'm happily running 4 rigs all with 4x 7970s (16x7970s total) without powered risers and they run for days on end. They only stop when i decide to "fettle". I keep them cool though - all temps under 65 except one that runs hot for some reason with a high of 75. Could it be a heat issue?

Also what PSU are you using as it may be that it's wobbling under the load?

[rtgornik]

I'm happily running 4 rigs all with 4x 7970s (16x7970s total) without powered risers and they run for days on end. They only stop when i decide to "fettle". I keep them cool though - all temps under 65 except one that runs hot for some reason with a high of 75. Could it be a heat issue?

Also what PSU are you using as it may be that it's wobbling under the load?

I've tried a Seasonic 1250w and a Rosewill Lightning 1300w, with similar results.

I have cgminer set to auto-fan with a target temp of 75 degrees. They run at 72 an ~50% fan.

I haven't considered that it can be a temp issue. I ran a single card like this for an entire week without issue.

[Wilderness]

yeah I'm running a Corsair 1200 w and the temps are all below 80 for mine

[boozer]

Boozer do you use powered risers for all the cards? Just wondering if I would need to get powered risers for the 16x16 risers in a 4 x 7970 rig or just the 1 x 16

Also can not having enough power from running unpowered adapters cause the machine to crash after being able to run for 10+ hours?

thannks

I had 3 rigs with 4 cards running on MSI 890FX motherboards just fine for about a year without powered risers.  Now that I'm going to 6 cards, I plan on running 3 on powered risers and 3 powered from the board.

Are you overclocked at all?  If so, might try to run stock clocks for a day to see if that might be an issue.