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RekiChan

Has anyone tested SLI/CrossFire/NVLink with PCIe 4.0?

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Posted · Original PosterOP

As far as I know when you try to do SLI, the chipset reduces the PCIe 3.0 x16 bandwidth into PCIe 3.0 x8 to pair it to another slot with PCIe 3.0 x8 effectively means using 2 graphic cards with one PCIe 3.0 x16 bandwidth thus causing stuttering. Now that Ryzen 2 support PCIe 4.0 which doubled the bandwidth of PCIe 3.0, then does the stuttering with SLI still exist? Does PCIe 4.0 x8 has the same bandwidth as PCIe 3.0 x16?

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3 minutes ago, RekiChan said:

As far as I know when you try to do SLI, the chipset reduces the PCIe 3.0 x16 bandwidth into PCIe 3.0 x8 to pair it to another slot with PCIe 3.0 x8 effectively means using 2 graphic cards with one PCIe 3.0 x16 bandwidth thus causing stuttering. Now that Ryzen 2 support PCIe 4.0 which doubled the bandwidth of PCIe 3.0, then does the stuttering with SLI still exist? Does PCIe 4.0 x8 has the same bandwidth as PCIe 3.0 x16?

So using 2 cards at PCIe 3.0 x16 causes stuttering?  How so?

 

 


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The 5700/XT does not support Crossfire, so nobody has bothered testing PCI-E Gen 4 SLI since the two cards on the market on the standard doesn't support it!

 

The 5700XT is mid range Navi, supposedly, so I say we wait for the higher end sku's to launch and see if they support it.


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That's what sucks about the timing. Even though PCIe 4.0 could possibly fix the microstuttering issue, multi GPU configurations are no longer supported on modern graphics cards, or in modern games.


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Posted · Original PosterOP
11 minutes ago, jstudrawa said:

So using 2 cards at PCIe 3.0 x16 causes stuttering?  How so?

I'm not sure that's why I'm asking, I read up somewhere before saying that RTX2080Ti almost maxing the bandwidth of PCIe 3.0 x16.

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I read a few articles about the Pcie 4.0 bandwidth(not sure exactly where I read it) but current cards don't even use up Pcie 3.0 bandwidth,not even a RTX2080Ti.

The only place It benefits anything is Pcie 4.0 SSD's. and the only Pcie 4.0 GPU out is the 5700's.

again not too sure on all of it but just something I've read.

 

 


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Posted · Original PosterOP

Accoding to TechPowerUp benchmark result of PCIe 3.0 x4 up to PCI 3.0 x16 with RTX2080 TI, It seems that the bandwidth usages depend on the games. Some games gained up to 15% fps increase while others don't have any fps difference from switching x8 to x16. I'm not sure about other workload though like video rendering or real-time simulation.

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