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post #1 of 4 (permalink) Old 02-02-2020, 07:54 PM - Thread Starter
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New Combo

love OCN, I have question about Ryzen 3700X.
are there any motherboards that deliver x16 x16? or am i limited to x8 x8
if so what is performance difference of x16 x16 VS x8 x8.
sorry if its a bit to much.
thx

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post #2 of 4 (permalink) Old 02-02-2020, 07:59 PM
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The Zen 2 architecture doesn't support that many lanes. You can have multiple slots that can deliver x16, but not concurrently.

Edit: I should say Ryzen 3000 series (like the 3700X) doesn't. Threadripper does.

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post #3 of 4 (permalink) Old 02-02-2020, 08:01 PM
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Ryzen 3000 chips only have 24 PCIe lanes to begin with. The usual allocation is 16 lanes for the GPU, 4 lanes for NVMe storage, and 4 lanes for the chipset link.



The x8 the chipset provides isn't a true x8.

Single GPUs have only just started becoming limited by PCIe 3.0 x8: https://www.techpowerup.com/review/n...scaling/7.html



Unless you're running 2 x 2080 Ti's in SLI, you're probably not going to get a performance hit. Pretty sure dual-GPU support nowadays is pretty sparse as well so there isn't a very strong use case for it.

Last edited by HybridCore; 02-02-2020 at 08:07 PM.
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post #4 of 4 (permalink) Old 02-12-2020, 01:00 AM
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Quote: Originally Posted by HybridCore View Post
...The x8 the chipset provides isn't a true x8....
That is only technically true if you use a PCIe v4 GPU. If you use PCIe v3 GPU (all current nVidia cards) you will have almost the entire PCIe 3.0 8x speed from the chipset as the connection between the chipset and the CPU is 4x PCIe 4.0 which is about as fast as PCIe 3.0 8x
But yeah, AM4 is limited to 2x8 or 1x16, although it will not matter for SLI/Crossfire even with 2080Ti cards...

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