If I'm using 2x gtx 1080's founders edition is 2 PCI express 16 slots important ?

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ravndal15

ravndal15

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Oct 4, 2012
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Hello guys .
I just got my second card today and manual said put cards into 2 PCI 16 slots . However reading my motherboard manual and looking inside it's got 1x16 , 1x8 and 1x4 . Do I need to upgrade my motherboard to get a board with 2 PCI express 16 slots ? Is there much of a difference ? Please help ?

Corsair Hydro Series H100i GTX 240mm Liquid CPU Cooler
Gigabyte GA-Z170X-Gaming 6 Motherboard
Intel Core i7 6700K
G.Skill Trident Z RGB F4-3000C15Q-32GTZR 32GB (4x8GB) DDR4
Samsung 840 EVO Series 750GB SSD
ASUS PG279Q ROG Swift 27in 165Hz G-Sync IPS Gaming Monitor
Gigabyte GeForce GTX 1080 Ti Founders Edition 11GB x2
Phanteks Enthoo Pro M Mid Tower Chassis Satin Black


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Solution
Seanie280672
No need to buy a new board, the cards will work fine, put the second card in the x8 slot, both the first card and the second card will work at x8 speed, this is due to PCI-E lane limitations from the cpu, 1 card on its own runs at x16 speeds, 2 cards and that get shared between the 2 cards so x8x8, it will still be faster than running 1 card, so there's nothing to worry about where performance is concerned.

I think if I remember correctly, Intel cpus only have 16 pci express lanes, and those are for the first and second x16 physical slots, so one card runs at x16, but 2 cards and it gets shared to x8 x8, the cpu can't physically supply anymore.

The rest of the pci express lanes come from the chipset for the other PCI-E slots like...
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Seanie280672

Seanie280672

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Mar 19, 2017
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No need to buy a new board, the cards will work fine, put the second card in the x8 slot, both the first card and the second card will work at x8 speed, this is due to PCI-E lane limitations from the cpu, 1 card on its own runs at x16 speeds, 2 cards and that get shared between the 2 cards so x8x8, it will still be faster than running 1 card, so there's nothing to worry about where performance is concerned.

I think if I remember correctly, Intel cpus only have 16 pci express lanes, and those are for the first and second x16 physical slots, so one card runs at x16, but 2 cards and it gets shared to x8 x8, the cpu can't physically supply anymore.

The rest of the pci express lanes come from the chipset for the other PCI-E slots like the x1 slots and the M.2 slots.
 
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