Help with PCI-E bandwith

[bisnettda23]

I recently bought a 980ti and am using my old 770 as a dedicated physx card. I noticed on bios that both pci-e slots are running at x8 even though the specification of my motherboard says I have 3 pci-e x 16 slots. I have the 980ti in the slot closest to the CPU and the 770 right below it.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130692[1]

Anyway to get the 980ti to run at x16 while have the dedicated physx card?

 

[Sakkura]

No. There are only 16 PCIe 3.0 lanes available from the CPU. Those are split to 8 lanes for each slot when you use two graphics cards.

But the performance loss from running a GTX 980 Ti at PCIe 3.0 x8 instead of x16 is minimal. A couple percent at most.

 

[Ironsounds]

Hello... 3 (support x16, x8/x8, x8/x4/x4 modes) there are only so many PCIe lanes to a MB... two cards splits them x8 x8.

 

[rujoesmith]

Unfortunately not with that chipset. That board can run the following configurations: "(support x16, x8/x8, x8/x4/x4 modes)"

It can only run one card at full 16x, however the performance impact on the 980ti running at 8x will be minimal. http://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/22.html

 

[spooky2th]

Nothing to worry about. The max bandwidth is x16. When 2 cards installed, the slots will be throttled down to 8x each. Even with one or two 980ti's, the cards won't even come close to 16x much less the 8x in 2 slots. But there will be an increase in FPS plus you will be able to run at higher resolutions better.