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PCI-E Lanes 16/16/8

Abrekiz
By Abrekiz
in CPUs, Motherboards, and Memory
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I'm shopping for a motherboard in the LGA2066 family, thinking of getting the I9-10900X. However, that processor supports 48-lane PCI-E... but I can't seem to find any motherboards that offer 3 x PCI-E running @ x16... For example, I'm looking at the X299 XPOWER GAMING AC, it shows that the most it does is 16/0/16/8.

The only reason I care, is because if I decide tomorrow to put 3 video cards in there with SLI (not looking to discuss the pro and cons of SLI atm), then all 3 cards would run at x8, because it can only do the lowest of the 3...right? What am I missing?? Can someone please enlighten me?

Thanks to everyone who takes the time to read this!

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Welcome to the forums!!!

 

I was looking in the manual for the MSI XPOWER GAMING AC and it appears to list up to 44-lane PCI-E but I was also thinking maybe the manuals are a bit outdated due to the fact that at the time the boards came out, they had 44-lane PCI-E CPUs available. What video cards were you thinking about using in SLI?? 

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Not 100% sure yet, I was thinking of the 2070 super, from the NVIDIA site, it says that's the lowest RTX that can do NVLINK SLI.

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4 minutes ago, Abrekiz said:

Not 100% sure yet, I was thinking of the 2070 super, from the NVIDIA site, it says that's the lowest RTX that can do NVLINK SLI.

Ok, I was checking the compatibility tab on the support page for the motherboard and it lists a 2070 with a maximum of 1 for Multi-Graphics Technology. The list is pretty helpful in determining what is compatible and what is not, as well as RAM. 

 

https://www.msi.com/Motherboard/support/X299-XPOWER-GAMING-AC#support-vga

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It looks like the RTX 2070 Super is only limited to 2-way SLI anyways...

Don't recall the RTX 2000 series supporting more than 2 GPUs.

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fyi OP Nvidia announced they will no longer support multi gpu for gaming, meaning game developers have to code for it. LTT did a video on it recently, very few games offer any support. 

 

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33 minutes ago, Abrekiz said:

Not 100% sure yet, I was thinking of the 2070 super, from the NVIDIA site, it says that's the lowest RTX that can do NVLINK SLI.

20 series GPU can only do 2 way I think

 

Have to go below that for 3 way

 

By then... U might as well use a better GPU, but that's not what you came here to listen

-sigh- feeling like I'm being too negative lately

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Pascal is the last for 3 way or 4 way, those are good with 8x only.

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WS x299 SAGE seems to support 48 lanes.  GPUs aren't heavy pci lane users if they have a lot of VRAM so the 8x 16x difference may be insignificant.

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Thanks everyone! Lots of info here! The reasoning for the SLI config/question was to setup multiple 4k monitors... but I wonder if that's even needed, maybe just the run the cards separate and split the monitors between them? Idk, maybe be a question for the V-Card section.

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10 minutes ago, Abrekiz said:

Thanks everyone! Lots of info here! The reasoning for the SLI config/question was to setup multiple 4k monitors... but I wonder if that's even needed, maybe just the run the cards separate and split the monitors between them? Idk, maybe be a question for the V-Card section.

How many 4k monitors? most gpus can do 3-4 4k monitors already.

 

ANd you don't need sli or high speed pcie for multi gpu. a gpu with a x4 link will work fine here for driving monitors.

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I'm shooting for 4, but might step up to 6 some day. I used to do 6 x 22 @ 1080 and it was great. So I plan on starting with 4 and see where I go from there. So just the gpu's w/o sli will do the job? 

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What’s the point of the sli? Doing surround gaming with them? As that’s the only purpose for sli and multi monitor. 
If it just to display or mirror and combo can be used and even the 8x is more than enough then any of those cards will handle. 

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1 hour ago, Mick Naughty said:

What’s the point of the sli? Doing surround gaming with them? As that’s the only purpose for sli and multi monitor. 
If it just to display or mirror and combo can be used and even the 8x is more than enough then any of those cards will handle. 

So if I don't SLI I can't do surround gaming? I though the main purpose of SLI was to funnel multi-GPU to a single monitor... If you have any articles that can better detail/inform on the matter I would greatly appreciate it.

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10 hours ago, Abrekiz said:

So if I don't SLI I can't do surround gaming? I though the main purpose of SLI was to funnel multi-GPU to a single monitor... If you have any articles that can better detail/inform on the matter I would greatly appreciate it.

Sli does both. Single or multi monitor. Which Is why im asking what youre doing. If the purpose is gaming on all of them, may just want to pick cards that would actually give you a playable framerate.

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