June 16, 20215 yr 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
June 16, 20215 yr Author 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?
June 16, 20215 yr 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
June 16, 20215 yr Author 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?
June 17, 20215 yr 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.
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