Tom's Hardware > Forum > Motherboards & Memory > General Motherboard > PCI-E bus/link speed. 8x and 16x?

PCI-E bus/link speed. 8x and 16x?

Forum Motherboards & Memory : General Motherboard - PCI-E bus/link speed. 8x and 16x?

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xxcoop42xx   09-22-2008 at 11:00:05 PM

hey everyone, my pc specs are in the sig. my question/understanding of a mobo with 2 pci-e x16 slots if you use 2 gpu's the bus/link speed will be 8x (i think) now if i take the 2 gpu's out and replace them with 1 gpu, shouldnt the bus/link speed change to 16x. my understanding of "link" speed is how fast the 2 pci-e slots can talk to each other. but if i dont have 2 gpu's and im only using 1 gpu, shouldnt the speed of the single bus slot be running at 16x? reason why i ask is because in gpu-z when i had SLI 9800GT it showed the bus interface as PCI-E x16@8x. but now i have a GTX 260 core 216 (1 gpu) so shouldnt it change to PCI-E x16@16x? and if theres a way to change it, all help is greatly appreciated.

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m0ngy   10-20-2009 at 03:28:10 PM
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xxcoop42xx wrote :

hey everyone, my pc specs are in the sig. my question/understanding of a mobo with 2 pci-e x16 slots if you use 2 gpu's the bus/link speed will be 8x (i think) now if i take the 2 gpu's out and replace them with 1 gpu, shouldnt the bus/link speed change to 16x. my understanding of "link" speed is how fast the 2 pci-e slots can talk to each other. but if i dont have 2 gpu's and im only using 1 gpu, shouldnt the speed of the single bus slot be running at 16x? reason why i ask is because in gpu-z when i had SLI 9800GT it showed the bus interface as PCI-E x16@8x. but now i have a GTX 260 core 216 (1 gpu) so shouldnt it change to PCI-E x16@16x? and if theres a way to change it, all help is greatly appreciated.



hi man, i'm having the same problem as you. i have a P6T Deluxe mobo with 3 PCI-e slots @ 16X, 16X, and 1X. i'm using only one video card in the primary PCI-e slot yet i'm only getting 8X not 16X. did you work it out? thanks

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OvrClkr   10-20-2009 at 06:14:15 PM
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m0ngy wrote :

hi man, i'm having the same problem as you. i have a P6T Deluxe mobo with 3 PCI-e slots @ 16X, 16X, and 1X. i'm using only one video card in the primary PCI-e slot yet i'm only getting 8X not 16X. did you work it out? thanks



If you are using the top PCI-E slot then your GPU is running at x16.

------------------------------ 550 @ 4.0 Ghz 1.425v
BFG GTX 260 (216)
4GB G.Skill @ 960MHz
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