Will Loading Up My PCI Express Slots Affect GPU Performance?












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I wanted to know if loading up my PCI bus with different cards will affect my GPU's gaming performance.



I have a ASUS Maximus VI Formula with 3 PCIe x16 3.0 slots and 3 PCIe x1 slots. I have a single GPU in the first x16 slot (GTX 780ti), and a sound card in the first x1 (Creative XFi Titanium). I know the x16 slots can run in 3 modes: x16, x8 x8, and x8 x4 x4.



My question is if I add more cards in the x1 slots, or possibly non-graphics cards in the x16 slots, will it make my GPU run in x8 mode? Will that affect gaming performance? How much?










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  • 1





    No; They are separate lanes for a reason.

    – Ramhound
    Nov 24 '14 at 13:39






  • 1





    I'd say the only time it might: When using dual PCIe x16 slots and the motherboard downgrades the GPU to x8.

    – Austin T French
    Nov 24 '14 at 14:01
















0















I wanted to know if loading up my PCI bus with different cards will affect my GPU's gaming performance.



I have a ASUS Maximus VI Formula with 3 PCIe x16 3.0 slots and 3 PCIe x1 slots. I have a single GPU in the first x16 slot (GTX 780ti), and a sound card in the first x1 (Creative XFi Titanium). I know the x16 slots can run in 3 modes: x16, x8 x8, and x8 x4 x4.



My question is if I add more cards in the x1 slots, or possibly non-graphics cards in the x16 slots, will it make my GPU run in x8 mode? Will that affect gaming performance? How much?










share|improve this question




















  • 1





    No; They are separate lanes for a reason.

    – Ramhound
    Nov 24 '14 at 13:39






  • 1





    I'd say the only time it might: When using dual PCIe x16 slots and the motherboard downgrades the GPU to x8.

    – Austin T French
    Nov 24 '14 at 14:01














0












0








0








I wanted to know if loading up my PCI bus with different cards will affect my GPU's gaming performance.



I have a ASUS Maximus VI Formula with 3 PCIe x16 3.0 slots and 3 PCIe x1 slots. I have a single GPU in the first x16 slot (GTX 780ti), and a sound card in the first x1 (Creative XFi Titanium). I know the x16 slots can run in 3 modes: x16, x8 x8, and x8 x4 x4.



My question is if I add more cards in the x1 slots, or possibly non-graphics cards in the x16 slots, will it make my GPU run in x8 mode? Will that affect gaming performance? How much?










share|improve this question
















I wanted to know if loading up my PCI bus with different cards will affect my GPU's gaming performance.



I have a ASUS Maximus VI Formula with 3 PCIe x16 3.0 slots and 3 PCIe x1 slots. I have a single GPU in the first x16 slot (GTX 780ti), and a sound card in the first x1 (Creative XFi Titanium). I know the x16 slots can run in 3 modes: x16, x8 x8, and x8 x4 x4.



My question is if I add more cards in the x1 slots, or possibly non-graphics cards in the x16 slots, will it make my GPU run in x8 mode? Will that affect gaming performance? How much?







graphics-card pci-express






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edited Nov 24 '14 at 14:00









Austin T French

9,4981939




9,4981939










asked Nov 24 '14 at 12:58









brackbrack

1192413




1192413








  • 1





    No; They are separate lanes for a reason.

    – Ramhound
    Nov 24 '14 at 13:39






  • 1





    I'd say the only time it might: When using dual PCIe x16 slots and the motherboard downgrades the GPU to x8.

    – Austin T French
    Nov 24 '14 at 14:01














  • 1





    No; They are separate lanes for a reason.

    – Ramhound
    Nov 24 '14 at 13:39






  • 1





    I'd say the only time it might: When using dual PCIe x16 slots and the motherboard downgrades the GPU to x8.

    – Austin T French
    Nov 24 '14 at 14:01








1




1





No; They are separate lanes for a reason.

– Ramhound
Nov 24 '14 at 13:39





No; They are separate lanes for a reason.

– Ramhound
Nov 24 '14 at 13:39




1




1





I'd say the only time it might: When using dual PCIe x16 slots and the motherboard downgrades the GPU to x8.

– Austin T French
Nov 24 '14 at 14:01





I'd say the only time it might: When using dual PCIe x16 slots and the motherboard downgrades the GPU to x8.

– Austin T French
Nov 24 '14 at 14:01










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If you use the other "x16" slots (quotes because they have the x16 physical connector but not the wiring), 8 PCIe lanes will be stolen from the GPU connection to provide a link to the other two slots.



You won't notice a performance drop in games running at PCIe 3.0 x8 (which the 780Ti supports), and probably wouldn't even notice any slowdown in PCIe 2.0 mode on x8.






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    If you use the other "x16" slots (quotes because they have the x16 physical connector but not the wiring), 8 PCIe lanes will be stolen from the GPU connection to provide a link to the other two slots.



    You won't notice a performance drop in games running at PCIe 3.0 x8 (which the 780Ti supports), and probably wouldn't even notice any slowdown in PCIe 2.0 mode on x8.






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      0














      If you use the other "x16" slots (quotes because they have the x16 physical connector but not the wiring), 8 PCIe lanes will be stolen from the GPU connection to provide a link to the other two slots.



      You won't notice a performance drop in games running at PCIe 3.0 x8 (which the 780Ti supports), and probably wouldn't even notice any slowdown in PCIe 2.0 mode on x8.






      share|improve this answer


























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        0







        If you use the other "x16" slots (quotes because they have the x16 physical connector but not the wiring), 8 PCIe lanes will be stolen from the GPU connection to provide a link to the other two slots.



        You won't notice a performance drop in games running at PCIe 3.0 x8 (which the 780Ti supports), and probably wouldn't even notice any slowdown in PCIe 2.0 mode on x8.






        share|improve this answer













        If you use the other "x16" slots (quotes because they have the x16 physical connector but not the wiring), 8 PCIe lanes will be stolen from the GPU connection to provide a link to the other two slots.



        You won't notice a performance drop in games running at PCIe 3.0 x8 (which the 780Ti supports), and probably wouldn't even notice any slowdown in PCIe 2.0 mode on x8.







        share|improve this answer












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        answered Jan 16 at 15:40









        Ben VoigtBen Voigt

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        5,50112954






























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