Why cant x99 support 16x 8x 8x 8x?

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RaDiKaL_
Haven't found a full review of it's architecture yet, but in previous models some of the PCI-E lanes were used for SATA III and USB 3.0 connections, I guess it's the same now so while there are 40 lanes not all of them will be strictly for GPUs.
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RaDiKaL_

RaDiKaL_

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Apr 17, 2006
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Haven't found a full review of it's architecture yet, but in previous models some of the PCI-E lanes were used for SATA III and USB 3.0 connections, I guess it's the same now so while there are 40 lanes not all of them will be strictly for GPUs.
 
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Tradesman1

Tradesman1

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Jun 5, 2013
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Damn_Rookie

Damn_Rookie

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It seems to be a choice motherboard manufacturers make during the design phase (where they wire in which interface will share with which other interface), as there are boards that support what you seek.

Unless I'm misreading the manual and specifications, The GIGABYTE GA-X99-UD5 WIFI for example runs x8/x8/x16/x8 when all four x16 slots are filled (and x16/x16/x8 with three cards). The slot that runs permanently in x16 mode doesn't share with any other interface or slot.

But in all honesty I'd prefer them all x8, with some of the remaining lanes wired in to an M.2 Ultra slot.
 
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