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Video card bandwidth in PCIE3 slot of X570 Taichi? |
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Ray62 
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Joined: 01 Jul 2018 Location: Germany, Berlin Status: Offline Points: 706 |
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 Posted: 17 Aug 2019 at 2:11pm |
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Pay attention! This is just an information for the capabilities of the card.
You should check the PCIE slots under Motherboard->SMBIOS DMI->System Slots where you can see the slot data bus width. The PCIE3 will show you the 8x mode, i guess. |
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Asrock Fatal1ty X370 Professional Gaming Offline
Under test: MSI X570_MEG_ACE | AMD Ryzen 9 3900X | Scythe Mugen5 | 2x16GB F4-3200C14D-32GTZ@3466 | ASUS GeForce GTX 1080 Ti FE |
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shmerl
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Posted: 19 Aug 2019 at 2:45am |
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Or on Linux, try lstopo.
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foxx1337
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Joined: 19 Jul 2019 Location: Munich Status: Offline Points: 74 |
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Posted: 19 Aug 2019 at 4:08am |
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Hey Ray62, I didn't know about that. I don't think it does, instead:
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Ryzen 3900X, Taichi X570
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gizmic
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Posted: 19 Aug 2019 at 10:26am |
pcie3 X16 = pcie4 X8 (8GB/s) |
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Ray62
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Posted: 19 Aug 2019 at 3:48pm |
It looks as it should in the PCIE3 slot: GPU is a PCIe 3.0 one Max. link width is 16 Current link width is 8 If you would place the card in PCIE1, it should be: GPU is a PCIe 3.0 one Max. link width is 16 Current link width is 16 |
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Asrock Fatal1ty X370 Professional Gaming Offline
Under test: MSI X570_MEG_ACE | AMD Ryzen 9 3900X | Scythe Mugen5 | 2x16GB F4-3200C14D-32GTZ@3466 | ASUS GeForce GTX 1080 Ti FE |
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foxx1337
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Posted: 20 Aug 2019 at 7:02am |
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You're wrong, Ray62; according to https://en.wikipedia.org/wiki/PCI_Express#History_and_revisions, PCIe 3 works at 8 billion transactions per second.
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Ryzen 3900X, Taichi X570
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gizmic
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Posted: 20 Aug 2019 at 10:18am |
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thats the transfer rate / link rate it doesn't change in the whole pcie3 range x1-x16
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shmerl
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Posted: 06 Sep 2019 at 9:26am |
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OK, I run a test (The Witcher 3 in Wine+dxvk on Linux, 1920x1200, max settings, hairworks off). I don't see any difference in framerate, besides regular fluctuations:
slot 1:  slot 2:  So I'd assume the difference is slots not impacting it. |
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gizmic
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Posted: 06 Sep 2019 at 3:42pm |
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even if its a titan or a dual pcie3.0 8X is more than enough
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Xaltar
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Posted: 06 Sep 2019 at 4:03pm |
Agreed, currently I don't believe even the 2080ti or RTX Titan can fully saturate the bandwidth of PCIe 3.0 x8. As far as I am aware, they can barely saturate PCIe 3.0 x4. Contrary to popular belief, GPUs do not fuel PCIe development, it is mostly designed for storage and network throughput. GPUs are quite a bit behind what a PCIe SSD or high bandwidth LAN adapter can demand. |
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foxx1337 wrote: