I’m looking at quad port 2.5Gbe Intel PCIe cards. These cards seem to be mostly x4 physically (usually PCIe gen 3) whilst I have a PCIe Gen4 X1 slot, which is more the theoretical bandwidth that the card can support. The card needs at the most PCIE Gen 3 X2 == PCIE Gen 4 X1 in terms of bandwidth.

How do I fit the card into a PCIe x1 slot? Won’t it lose performance if all the pins are not connected to the physical PCIe connector? Is there a PCIe x1 riser that the community likes that is somewhat affordable?

Thanks

  • rice@lemmy.orgEnglish
    3·
    2 days ago

    Yea you may lose performance or may not, depends how the chip works on the actual pcie card. (Even if the slot has more than enough bandwidth at x1)

    You can easily do a performance test after plugging it in though. Typically even an x8 interface will work with just x1 pcie connectors just slower. Even if that x1 interface is several generations later and has more bandwidth than that x8 needs lol

    some ramblings of why just having the physical slots doesn’t always mean ___ can be found on this completely unrelated repo: https://github.com/magic-blue-smoke/Dual-Edge-TPU-Adapter (might be in an issue thread too unfortunately but he has more info here on how bandwidth works at that level than any other sites)