Second GTX750 turns off.

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spitfire_mk_2
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Message 1860642 - Posted: 9 Apr 2017, 23:15:33 UTC

I run dual GTX750Ti SC single fan, no connector for external power.
The second card, that does not have monitor attached, keeps turning itself off. I have gone through 4 drivers over the past year, basically upgrading to the latest driver hoping for problem to go away.

OS: Win7-64
Nvidia driver: 378.92

Anyone know anything about this issue?
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Message 1860643 - Posted: 9 Apr 2017, 23:19:59 UTC - in response to Message 1860642.  

Both cards are same manufacturer? What does the first 30 lines of the start log say?
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Message 1860644 - Posted: 9 Apr 2017, 23:20:31 UTC

Does your PSU have a single 12v rail or is it of the dual 12v rail design?

If the latter than that is likely where your problem is.

Cheers.
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Message 1860662 - Posted: 10 Apr 2017, 2:07:57 UTC - in response to Message 1860642.  
Last modified: 10 Apr 2017, 2:08:43 UTC

I'm thinking that possibly 'Power Options' is shutting off the seaming unused card when turning off the monitor.

There is a setting for PCI power options in there as well.
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Message 1860823 - Posted: 10 Apr 2017, 22:54:12 UTC - in response to Message 1860644.  

Does your PSU have a single 12v rail or is it of the dual 12v rail design?

If the latter than that is likely where your problem is.

Cheers.

Ah!
Yes, my PSU is dual 12V rail.
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Message 1860826 - Posted: 10 Apr 2017, 22:58:48 UTC - in response to Message 1860662.  

I'm thinking that possibly 'Power Options' is shutting off the seaming unused card when turning off the monitor.

There is a setting for PCI power options in there as well.

I have: Turn Off Display set to Never.
However, using the direction of your thinking, I have noticed: PCI Express->Link State Power Management->Maximum Power Saving. I changed it to Off. Will see if that changes anything.
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Message 1860834 - Posted: 10 Apr 2017, 23:12:03 UTC - in response to Message 1860823.  

Does your PSU have a single 12v rail or is it of the dual 12v rail design?

If the latter than that is likely where your problem is.

Cheers.

Ah!
Yes, my PSU is dual 12V rail.

Well you're using basically 1 rail to power mobo and those GPU's (probably overloading it and causing the 2nd GPU to shut down due to insufficient power) while the other rail is doing very little.

If your problem continues then get a single 12v rail PSU.

Cheers.
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Message 1860839 - Posted: 10 Apr 2017, 23:28:21 UTC - in response to Message 1860834.  

Does your PSU have a single 12v rail or is it of the dual 12v rail design?

If the latter than that is likely where your problem is.

Cheers.

Ah!
Yes, my PSU is dual 12V rail.

Well you're using basically 1 rail to power mobo and those GPU's (probably overloading it and causing the 2nd GPU to shut down due to insufficient power) while the other rail is doing very little.

If your problem continues then get a single 12v rail PSU.

Cheers.

Sounds reasonable. I will keep this in mind.

Side note. Last time when the card turned off I turned off BOINC, went to device manager, disabled the card (since it is the one that does not have monitor attached, I think that is the only way to figure out which card is which in device manager), then enabled the card. Started BOINC and both cards showed up. Did not even have to restart the pc (I was restarting the pc in the past when I saw that only one card is showing in BOINC).
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Message boards : Number crunching : Second GTX750 turns off.


 
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