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Dual 1080ti options in P710

2017-08-22, 11:01 AM

Hello!

im running a single Xeon cpu with a 1080ti in a p710 for intensive calculations. 

 

Im looking to add a second identical card but I’ve no spare PCIE power connections. 

 

-ive looked at replacing the PSU with a Corsair model with an 14 to 25pin converter but the psu physically slots into the mother board by card interface. Not sure what this does but I presume if I got a Corsair or similar it won’t work. Am I correct in this?

 

-could i connect together a number of sata cables and the 2 spare cpu power connection to make up the 12 pin power adapter required. 

 

What are my options, if any. 

 

im fully aware that this configuration is completely unsupported by Lenovo and am happy to take the risk. 

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4982 Posts

02-22-2010

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Re: Dual 1080ti options in P710

2017-08-22, 15:09 PM

This one is kind of complicated to answer.

 

Adding an off-the-shelf power supply to P710 is pretty much impossible.  We use a proprietary design in those systems that nobody else has, so your only choice for power supplies in P710 are the ones that we've designed.

 

That being said, which power supply is in your current P710?  Since you're already running a single 1080Ti, I'm going to assume you have the 850W PSU which should give you an 8-pin and 6-pin aux power drop.  So that's a good start since it's the highest rated PSU we have on P710.

 

The 1080Ti is a tricky card, especially in this scenario.  There are two concerns....the input peak EDP current (which is crazy high for this card and several other newer cards from Nvidia) and the overall card TDP (which is 250W TDP for each card).  

 

Normally I would say P710 would not support dual 250W cards, but in your specific case you stated that you're running a single CPU.  That might open things up enough to give enough headroom to make dual 1080ti cards work.  But that might run you straight into the other issue with the input peak EDP current.  We know a single 1080Ti functions OK on both fronts, but I'm not sure how dual 1080Ti cards would work.

 

If I can carve out some time, I can try to throw two of those in a P710 in the lab to test it out.  That would at least save you the hassle of buying a second 1080Ti only to find out it's going to shutdown on you when running heavy workloads.




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4982 Posts

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Re: Dual 1080ti options in P710

2017-08-22, 15:09 PM

This one is kind of complicated to answer.

 

Adding an off-the-shelf power supply to P710 is pretty much impossible.  We use a proprietary design in those systems that nobody else has, so your only choice for power supplies in P710 are the ones that we've designed.

 

That being said, which power supply is in your current P710?  Since you're already running a single 1080Ti, I'm going to assume you have the 850W PSU which should give you an 8-pin and 6-pin aux power drop.  So that's a good start since it's the highest rated PSU we have on P710.

 

The 1080Ti is a tricky card, especially in this scenario.  There are two concerns....the input peak EDP current (which is crazy high for this card and several other newer cards from Nvidia) and the overall card TDP (which is 250W TDP for each card).  

 

Normally I would say P710 would not support dual 250W cards, but in your specific case you stated that you're running a single CPU.  That might open things up enough to give enough headroom to make dual 1080ti cards work.  But that might run you straight into the other issue with the input peak EDP current.  We know a single 1080Ti functions OK on both fronts, but I'm not sure how dual 1080Ti cards would work.

 

If I can carve out some time, I can try to throw two of those in a P710 in the lab to test it out.  That would at least save you the hassle of buying a second 1080Ti only to find out it's going to shutdown on you when running heavy workloads.




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4 Posts

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Re: Dual 1080ti options in P710

2017-08-22, 17:33 PM

Thanks for getting back to me - I'd appreciate that check if you get the chance. Never gonna need a second xeon as all the work is gpu based.  

 

 ive an 850watt psu as you guessed correctly!  Using a voltage meter I'm pulling about 370watt off the wall at peak pressure. Internal temps seem fine too. 

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Re: Dual 1080ti options in P710

2017-08-23, 20:34 PM

Finally checked this out.  I think it's pretty safe to say dual 1080ti cards cannot be supported in P710 with the 850W PSU...even if only a single CPU is installed.

 

I'm fairly confident it's not the overall card power that's causing a problem here, but rather the input peak EDP current.  When we set it up and actually applied our stress utility to it, the system shut down within a matter of seconds.  Based on tons of other testing we've done with this, that's indicative of the rail level OCP (over current protection) kicking in.

 

If you truly want dual 1080Ti cards to function under load, you'd have to move up to the P910 (and still do some creative cabling for the power connections).

 

Wish I had a better answer for you, but at least this saved you from buying another card that would likely not function as expected.




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Re: Dual 1080ti options in P710

2017-08-23, 21:43 PM

Really appreciate you going through all that effort on my behalf.  I'll look at the 910 chassis.   Thanks!

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4982 Posts

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Re: Dual 1080ti options in P710

2017-08-23, 22:06 PM

Not sure what your timeframe (and budget) is, but if the P910 seems appealing in terms of multi GPU support, you might want to consider waiting it out a bit.  Can't really go into more detail at this time, but trust me :)




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