PCIe X8 network card in PCIe X16 slot

What should it be: PCIe specification stipulates that all slots start with 1x/v1.0, and negotiate that they can be used How many channels and what clock speed. No matter which supports more channels/clocks, some slots are designed to use larger cards and smaller cards are suitable for larger slots. Regardless of the highest specification that both parties can communicate (Number of channels and clock/version) are all negotiated and used speeds. Endpoints can support 1x, 2x, 4x, 8x, 16x and 32x, but there are no slots dedicated to 2x and 32x. The speed is determined by the main version number ( 2.5,5.0,8,16 GT / s) specified.

What exactly is it: Usually what should happen is what actually happened. But there are many boards (especially enthusiast boards) that do not Compliant with specifications. Some motherboards will not use 16x graphics cards in the first PCIe slot. Others will not autonegotiate correctly (usually return to fewer lanes-this seems particularly common when 2x cards negotiate to double Speed). In server-grade hardware, these problems are very rare, but it does happen. If the system/motherboard is from the same manufacturer as the card, you should be able to contact their support and find out if it is a supported configuration ( If they don’t know or can’t answer that it’s a huge red sign, you should consider not buying/returning from them). Also, try searching for your specific motherboard to see if anyone has reported the problem.

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My motherboard has only one x16 PCIe slot and no x8 slot. I am buying a NIC with a very specific configuration, but it only works with x8 slots. I can be in the x16 slot Insert x8 card? I googled this question and it seems very possible. However, I need expert answers. Also, is there any performance impact?

What should be: PCIe specification stipulates that all slots start with 1x/v1.0, and negotiate how many channels they can use and what clock speed. No matter which supports more More channels/clocks, some slots are designed to use larger cards and smaller cards are suitable for larger slots. Regardless of the highest specification (number of channels and clock/version) that both parties can communicate, it is a negotiation And the speed used. The endpoint can support 1x, 2x, 4x, 8x, 16x and 32x, but there are no slots dedicated to 2x and 32x. The speed is specified by the major version number (2.5, 5.0, 8, 16 GT/s) .

What is it: Usually what should happen is what actually happened. But there are many boards (especially audiophile boards) that do not meet the specifications. Some motherboards are in the first PCIe slot 16x graphics cards will not be used in the server. Others will not autonegotiate correctly (usually return to fewer lanes-this seems particularly common when 2x cards negotiate to 1x the speed). In server-level hardware, these issues are very Rare, but it does happen. If the system/motherboard is from the same manufacturer as the card, you should be able to contact their support and find out if it is a supported configuration (if they don’t know or can’t answer it’s a huge Red flag, you should consider not buying/returning from them). Also, try searching for your specific motherboard to see if anyone has reported the problem.