ASUS Z170M-PLUS two gpu pcie config?

Shiozaki · Apr 24, 2016

http://www.newegg.com/Product/Product.aspx?Item=N82E16813132573

am i reading this right, with two gpus the pcies lanes are x8 first card and x4 for the 2nd?

don256us · May 3, 2016

Sorry for the long delay in response. I'm reading it as 16 + 4. It does not appear to split the lanes. A look here seems to confirm that. I think that the first card will get full x16 even if you have another card in the x4 slot.

EarthDog · May 3, 2016

That is correct Don. While that slot is electrically 8x, the CPU only has 16 PCIe lanes. I would imagine that last slot is tied to the PCH so in fact it does end up in a 16+4 config.

don256us · May 3, 2016

I think you mean x16 but the same answer. One is x16 physical and electrical. The other is x16 physical but only x4 electrical.

EarthDog · May 3, 2016

Yes, I was talking the other one. Not the 16x slot (top). But it's 8x electrical I believe. It's half the length of the 16x above it. But since the PCH feeds it, it's 4x max even though it's wired for 8x.

don256us · May 4, 2016

I wasn't catching what you were referring to but I see it now. However, and what adds to the confusion is that both Newegg and Asus state that this slot is x4 max. Perhaps it is wired up for a different chipset that was not used in this version?

EarthDog · May 4, 2016

I can't speculate to that point. I do know its common to have a board wired for more than it can handle though.

ASUS Z170M-PLUS two gpu pcie config?

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