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X99-E WS More than 5 graphic cards

 
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post #1 of 9 (permalink) Old 10-01-2018, 05:08 PM - Thread Starter
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X99-E WS More than 5 graphic cards

I have an X99-E WS/USB3.1 motherboard, Intel i7 6850K broadwell-e 6-core CPU, 128G DDR4 RAM. I am attempting to install 7 EVGA GeForce GTX 1080 Ti graphics cards. I have two EVGA 1600 P2 PSUs installed. Running CentOS 7. I have five of the seven graphics cards installed, in slots PCIe x16_1, x16_2, x16_3, x16_5 and x16_7. I am using and 8 graphic card mining rig. I am using Thermaltake TT Premium PCI-E x16 3.0 Black Extender Riser cable to connect the graphic cards to the motherboard. The BIOS is upgraded to 3803.


When I attempt to connect sixth card in slot x16_4 the MB will not complete a boot cycle. When I connect the sixth card in the x16_6 slot the board boots but the BIOS will not recognize the card. I have modified the BIOS setting to GEN2, set 4G Decoding enabled, but the card will still only recognize 5 cards.


Any ideas.


BTW I do have all the power connectors on the MB connected to the PSUs.
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post #2 of 9 (permalink) Old 10-06-2018, 07:11 PM
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Try one more external power supply or removing M.2 to prevent occupying PCIe Lanes?
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post #3 of 9 (permalink) Old 10-09-2018, 09:51 AM - Thread Starter
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Quote: Originally Posted by F-man4 View Post
Try one more external power supply or removing M.2 to prevent occupying PCIe Lanes?
I already have two 1600 P2 PSUs, how do you remove the M.2, I have an M.2 port but nothing connected to it.
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post #4 of 9 (permalink) Old 10-12-2018, 08:03 AM
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Quote: Originally Posted by David Booth View Post
Quote: Originally Posted by F-man4 View Post
Try one more external power supply or removing M.2 to prevent occupying PCIe Lanes?
I already have two 1600 P2 PSUs, how do you remove the M.2, I have an M.2 port but nothing connected to it.
If M.2 is open then it's just fine.
I think you need to measure the actual power consumption because you're trying to load 6 1080Tis. Single 1080Ti cost me 375W when it's 100%.
At least to see whether your second PSU work or not.

Last edited by F-man4; 10-12-2018 at 06:58 PM.
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post #5 of 9 (permalink) Old 10-17-2018, 07:02 PM
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Why so many video cards?

Intel 920 D0

trying to decide on mobo ---- G.Skill Trident 2000 (6 Gig)Soundblaster X-Fi PCIeNVidia GTX 295
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post #6 of 9 (permalink) Old 10-17-2018, 07:18 PM
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Do you have the extra 6 pin above the pcie slots plugged in. You normally need that to use all of the pcie slots.

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post #7 of 9 (permalink) Old 10-17-2018, 07:35 PM
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Quote: Originally Posted by F-man4 View Post
If M.2 is open then it's just fine.
I think you need to measure the actual power consumption because you're trying to load 6 1080Tis. Single 1080Ti cost me 375W when it's 100%.
At least to see whether your second PSU work or not.

6x 1080 Ti won't have issues with 2x 1600w PSUs unless they're faulty.

Quote: Originally Posted by jpinard View Post
Why so many video cards?

Read the OP and he says what it's for.

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post #8 of 9 (permalink) Old 10-20-2018, 08:35 AM
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Quote: Originally Posted by The Pook View Post
6x 1080 Ti won't have issues with 2x 1600w PSUs unless they're faulty.
So I doubt if OP's 2nd 1600W PSU is started.
Unlike Antec HCP series, EVGA ones don't have a sync-thing to simultaneously start both PSUs.

Last edited by F-man4; 10-20-2018 at 08:40 AM.
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post #9 of 9 (permalink) Old 10-20-2018, 08:52 AM
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The problem might be the PCI-E Risers. You should buy that cheap x1. Also that MB has PLX chips which can cause problems.

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