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Pcie lane confusion - quick question

Last response: in Motherboards
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January 7, 2013 11:18:11 PM

The board I ordered was ASUS p8z77 v lx
I'm going to be running a 7850 in my PCIE 3 slot at x16
Will using a pcie x1 lane for my wireless card drop the bandwith avaliable to my GPU?
Just because I understand some lanes share bandwith when using two GPUs.

Sorry if a stupid question. Just ordered all my parts and I'm fretting about everything being compatible.
a b V Motherboard
January 7, 2013 11:22:26 PM

No, the bandwidth to the card will not be reduced.
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a c 426 V Motherboard
January 8, 2013 1:54:11 AM

+1^
The PCIe X16 slots' bandwidth are separate from the other PCIe slots on that board.
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a b V Motherboard
January 8, 2013 3:21:52 PM

Some motherboards have two pcie x16 slots. So if you out 1 card in any of the two slots then the slot will offer x16 speeds but as soon as you put a second card in the remaining x16 slot then the speed of both the slots will run at x8 speeds
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a c 426 V Motherboard
January 8, 2013 5:01:47 PM

+1^
Good point. And in the case of the OP's ASUS p8z77 v lx, it is even worse. The 2nd PCIe X16 slot is only X4 electrically. So I would advise against wasting money on a 2nd card in the 2nd slot anyway.

OP: Use a single card and you will have full X16 bandwidth.
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January 8, 2013 8:49:15 PM

Best answer selected by gr8mohawk.
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