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Old 25-01-18, 06:15 PM
Nine Iron Nine Iron is offline
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nvme(s) and GPU - PCI-e lanes?

Bit of a quandary, here:

My 8350K has sixteen PCI-e 3.0 lanes available, four of which have gone to my existing nvme boot drive. I'm considering adding another nvme drive for storage - another four lanes - if I can bag it cheap enough, but I also want to add a GPU very soon.

Given that I will only ever go as far as, say, a GTX 1060 or other lower-midrange card, can I assume that it will run on eight PCI-e 3.0 lanes with no performance penalty relative to sixteen? I'm told that even the top-end cards can't saturate sixteen lanes...

Also, will the motherboard sort out the desired 1x8 + 2x4 lane splitting, or will I have to do that myself?

Many thanks!

9/I

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Old 25-01-18, 06:17 PM
NeverBackDown NeverBackDown is offline
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Not sure which board you have but the second NVMe slot may not run off the CPU

However assuming it does, you are correct in that both will run x4 and the GPU will be running x8 which is more than enough for the 1050ti in your signature or the GTX 1060 you asked about.
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Old 25-01-18, 06:21 PM
Nine Iron Nine Iron is offline
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Well, that was timely - my offer on that nvme drive was accepted!

The board is a Z370N Wifi - the little ITX one - from Gigabyte. Two m.2 slots, one dedicated nvme, one nvme/SATA. Not sure how that relates to the chipset, but worst case my GPU will run at 8x and no difference will be seen.
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Old 25-01-18, 06:25 PM
Bartacus Bartacus is offline
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You won't see a difference. We Ryzen adopters who have dual GPUs had the same question, since there are only 16 GPU lanes on X370 for both cards. x8 / x8 works just fine.
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Old 25-01-18, 06:57 PM
Nine Iron Nine Iron is offline
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Just remembered the other m.2 is on the BACK of the board - feck!

Board-out jobbie!
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