Need help with deciding NvLink size

[rohitgupta1975]

I will be connecting two RTX 2080 Ti cards in alternate PCIe slots on my ASUS ROG Rampage V 10th Anniversary Edition mobo. Which size of NvLink should I buy? I am unable to understand the image that Nvidia has put on their website (3-slot 60.96mm and 4-slot 81.26mm)

 

[Barty1884]

There's 4 PCIe physical x16 slots on the board.

If I'm understanding, you want to use slot #1 (nearest the CPU), skip a x16 slot & then use the 3rd? In which case.... a 3-slot bridge would be what you're looking for.

You wouldn't need the 4 slot, unless you were using slot #1 (nearest CPU) and #4 (at the bottom of the board).

 

[rohitgupta1975]

There's 4 PCIe physical x16 slots on the board.

If I'm understanding, you want to use slot #1 (nearest the CPU), skip a x16 slot & then use the 3rd? In which case.... a 3-slot bridge would be what you're looking for.

You wouldn't need the 4 slot, unless you were using slot #1 (nearest CPU) and #4 (at the bottom of the board).

Thanks Barty. That clears it up. I will go for the 3-slot link. I was confused by the dimensions in Nvidia's image

 

[rohitgupta1975]

There's 4 PCIe physical x16 slots on the board.

If I'm understanding, you want to use slot #1 (nearest the CPU), skip a x16 slot & then use the 3rd? In which case.... a 3-slot bridge would be what you're looking for.

You wouldn't need the 4 slot, unless you were using slot #1 (nearest CPU) and #4 (at the bottom of the board).

I re-checked. The center-to-center distance between slot 1 and slot 3 is 81mm. Since each 20mm is considered 1 slot (I read that somewhere; also on google images), that's a 4-slot distance. So I should be using a 4-slot (81mm) bridge.

See this: https://www.gamespot.com/forums/pc-and-av-hardware-909394553/what-sli-bridge-do-i-need-33240123/

Do you agree?

 

[rohitgupta1975]

For the sake of closing this thread: I have my PCIe x16 slots at ~80mm distance (center-to-center) and a 4-slot NvLink bridge (that I finally bought) plugged nicely in my cards. So in conclusion: 1 slot = 20mm . So if you have slots at 60mm distance, use a 3-slot NvLink bridge. For 80mm, use 4-slot.