theun Posted June 16, 2021 Share Posted June 16, 2021 Hey all, Can you please give me a hand. I currently have a Gigabyte Z390 UD with a Intel 9900K. I would like help sorting out/finding how I can run a SAS controller, Video card and a 10gbe NIC. Struggling to understand PCI versions and speeds etc. It looks like this mother board only have 1 x PCI 16x 3.0 @ 16x 2 x PCI x16 slots running at x4 Thanks Theun Quote Link to comment
Michael_P Posted June 16, 2021 Share Posted June 16, 2021 Video in top slot HBA in the second NIC in the third Quote Link to comment
theun Posted June 16, 2021 Author Share Posted June 16, 2021 Thanks @Michael_P, Would that not mean as an example the NIC would be in a 16x pcie version 3.0 slot that can only run at x4 and the NIC needs/wants a PCIe version 3.0 8x slot? Quote Link to comment
tjb_altf4 Posted June 16, 2021 Share Posted June 16, 2021 1x PCIe 3.0 lane runs at 1GB/s 4x PCIe 3.0 lanes has 4GB/s bandwidth, or 32Gb/s Even if you are using a PCIe 2.0 card (500MB/s per lane), you still have plenty of headroom at 16Gb/s Quote Link to comment
theun Posted June 16, 2021 Author Share Posted June 16, 2021 Ta @tjb_altf4, Is this the same case for example using a Card that is PCIe 2.0 8x in a PCIe 3.0 4x slot? as it will only be connecting with half of the lanes? Quote Link to comment
tjb_altf4 Posted June 17, 2021 Share Posted June 17, 2021 18 minutes ago, theun said: Ta @tjb_altf4, Is this the same case for example using a Card that is PCIe 2.0 8x in a PCIe 3.0 4x slot? as it will only be connecting with half of the lanes? Yes. Half the lanes, and it will connect at PCIe 2.0 speeds (to match the card). For a typical HBA using HDDs ( up to 8 ), you probably wouldn't notice much of a difference, but you can see some real world testing below to get an idea. Quote Link to comment
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