splitting x16 slot into two x8 slots and using 2 GPU on those two slots.

Tech_TTT · Apr 10, 2017

Hello,

Simple Question ,

is there a way to split the x16 PCIe slot into two x8 PCIe slots and both being Active? that is accept two GPU cards in SLI ?

I want to build a very compact SLI Machine using ITX motherboard with just one slot as you know.

the Z270 itx motherboard should allow the 16 lanes to be divided into two 8 lanes slots as in ATX motherboards .

so is it possible ? is there any split PCIe x16 to 2xPCIe x8 cable ?

This is very important for me , I want to make the smallest PC case that can take SLI GPU .

feelinfroggy777 · Apr 10, 2017

An mITX board only has one PCIe slot, so there is only room for one card. Some laptops have external gpu that can be used, but I think that they must be used with by the manufacturer.

So to answer your question, no.

boju · Apr 10, 2017

Wow didn't know it was possible looks like you're after is firstly PCIE Bifurcation functionality with the motherboard which i see from link below it featured on x99 and z170. Reliability will be the question though as it's not a common thing to do so support for it wouldn't be high priority.

https://smallformfactor.net/forum/threads/pci-e-bifurcation.1398/

Tech_TTT · Apr 10, 2017

boju :

lol I better act fast before some one makes it before me

I always knew it is possible for the functionality of splitting 16 lanes already exists in X99 and Z170/Z270 and ALL SLI enabled chipsets ... I was thinking it needs a custom bios as well ..

boju · Apr 10, 2017

Sub link from the above link https://hardforum.com/threads/pcie-bifurcation.1870298/page-11#post-1042729050

Geekwad · Apr 10, 2017

Though you could devise a way, this is really what mATX is for. Besides, you'd still have to find a spot for the two GPUs.

This is quite compact though, and has excellent airflow for a mGPU setup:

http://www.thermaltake.com/Chassis/Mid_Tower_/Core/C_00002559/Core_V21/design.htm

Tech_TTT · Apr 10, 2017

Geekwad :

there is a challenge going around the world for the most compact PC that can take everything..

so far , Dancase made the smallest case for one card.

https://www.dan-cases.com/

but no one could make the smallest case with 2 cards yet

we need the short ITX motheroad to place the powersupply at the front .. otherwise it would be huge.

its about the challenge not my main pc

Geekwad · Apr 11, 2017

Ah, I get it

Bifurcate away then, or look to something like a Pro Duo that already has two GPU's on a single x16 PCIe slot (though may need to build a custom SFF case for it and de-house a PSU to make it all work).

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splitting x16 slot into two x8 slots and using 2 GPU on those two slots.

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