The difference between PCIe x1, x4, x8, x16 and x32

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PCIe cards can always operate in PCIe slots with the same or more lanes than the card For example, an x8 card can operate in a slot with x8, x16, or x32 lanes

Engel: FYI Slot 2 as you shown is running at PCI-E 4X I think I thought that Crossfire was doing 8X 8X Strange I Slot Every motherboard has a number of PCIe slots used to add GPUs, SSDs, and RAID card etc As mentioned above, a single PCIe slot

slot hack program Most of the motherboard I see which have 4x PCIe 16x slots use in fact two slots as full 16x slots, and two as 8x slots, thus Should work fine, it's the same as putting a 16x card in to a slot that's only wired for 8x or 4x, you don't get the full bandwidth but it will