Trying to get more than 3 cards to work on a motherboard.

[darkshad]

Hi.  I have the following motherboard, PSU, and GPUs.  I bought 5 GPUs and right now I only have 3 out of the 5 working.  I would like to get the other 2 working.  I’m using risers.  I’ve verified that the cards and risers are good – put them in a different machine.

I think there is probably something in the BIOS I need to turn on, or maybe I need to jumper a PCI slot in the motherboard?  I’ve done some googling and it appears that some of the motherboards need a PCI slot jumpered with a wire in order to get the rest of the slots working, is this correct?

Appreciate any thoughts you may have.


Motherboard – ASRock FATAL1TY B250M PERFORMANCE MicroATX Motherboard
https://www.amazon.com/gp/product/B01MRRT6QK/ref=oh_aui_detailpage_o07_s01?ie=UTF8&psc=1
http://www.asrock.com/MB/Intel/Fatal1ty%20B250M%20Performance/index.asp
http://asrock.pc.cdn.bitgravity.com/Manual/Fatal1ty%20B250M%20Performance.pdf


GPU – MSI GeForce GTX 1080 TI ARMOR 11G OC
https://www.newegg.com/Product/Product.aspx?Item=9SIAD6H5US6313&cm_re=MSI_GeForce_GTX_1080_Ti_DirectX_12_GeForce_GTX_1080_TI_ARMOR-_-14-137-111-_-Product


Power Supply – LEPA G Series1600W 80+ Gold Certified
https://www.amazon.com/gp/product/B007W5TV6K/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

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[gctom]

Linux or Windows?

Anyway 4 Gpu should work at least.

For 5 or more make sure Above 4G is enabled in bios and that you installed your OS in uefi mode.

Better check that first and if you did and it still doesn't work maybe bad riser, issue with motherboard, ...

[darkshad]

Windows.    Will give your suggestions a try and report back.

Thanks.

Linux or Windows?

Anyway 4 Gpu should work at least.

For 5 or more make sure Above 4G is enabled in bios and that you installed your OS in uefi mode.

Better check that first and if you did and it still doesn't work maybe bad riser, issue with motherboard, ...

[Pucchin Pudding]

Go into BIOS/UEFI and look for a PCIe setting that allows you to change between Auto, Gen1, Gen2, and Gen3. You're going to have to test whichever of those generation setting will be stable with your rig.