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mITX Ribbon Cable Question

post #1 of 7
Thread Starter 
One of the downsides (or upsides if you prefer) is that all mITX boards are single slot, meaning no corssfire/sli.

I was looking over some server parts for another reason and I came across this: Flexible dual PCIe riser. Basically it takes 1 x16 signal slot and splits it into 2 x8 slots. Since most all cards today are not bottle necked by a x8 slot there seems to be little problem with splitting it.

ARC2-PELY423-C7.jpg

I was wondering how well it would work on a mITX board with a couple of these to get them out of the way of each other.

ARC1-PEVX16B2-Cx.jpg

I know that riser cables increase latency. From what I've read, the differences are minuscule.

What is the validity of getting these and crossfiring/sli-ing two cards onto a mITX board?
     
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post #2 of 7
the dual riser wouldn't work cos it would be for servers only. the mobo would prob not support 2 cards on 1 pcie slot.
    
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post #3 of 7
If CF or SLI worked with the risers I can't see anything wrong with it.
It looks like a very elegant solution actually but I'd wonder what stops mobo manufacturers from just including one of them instead of getting certified for CF and SLI and paying the licensing fees so there could be something I'm missing.

Edit: "Use with chipset that supports bifurcation" Mainstream chipsets probably don't. frown.gif

Edit again: Actually they probably do as that'd be how they split 16 lanes to 2x8 for SLI and CF without an extra chip.
Didn't think that one through really.
Edited by Mike-IRL - 9/16/11 at 6:25pm
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post #4 of 7
Thread Starter 
With Sandybridge I thought the PCI-e lanes were managed directly from the CPU meaning that it is all CPU dependent?
     
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post #5 of 7
one way to find out smile.gif

go on, order it and tell us
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post #6 of 7
One problem that I can see is it appears to be using just the PCIe slot to power both slots. With a pair of powerful GPUs this could exceed the rated PCIe slot power (75w). Other PCIe splitters I've seen add a power connector to power the second slot.
post #7 of 7
Thread Starter 
After doing a little more reading, even if the cards do fit and proper power is supplied, the bios needs to read that there are two cards.
This leaves three options:
1) Do some pin modding to the CPU. (I'd rather not.)
2) Do a bios mod on the code and have it read out two cards
3) Buy an active riser card.

Basically the active riser card has a chip similar to an nf200 that serves the purpose of consolidating signal into one that the bios can read. These unfortunately can go for around $300+
     
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