Why do most mobo mfgs restrict PCI-e x16 slots to graphics cards only?

It seems that most motherboard manufacturers restrict the PCI-e x16 slots to graphics cards only on most consumer-level motherboards. Why is this? This is a violation of the PCI-e standard, since PCI-e was designed to be a general-purpose bus (unlike AGP which was designed strictly for graphics cards). For example, if someone wanted to use a PCI-e x4 or x8 RAID card, they are forced to buy a more expensive workstation motherboard, since most consumer-level motherboards restrict the x16 slots to graphics cards only. This is even the case with boards that have multiple x16 slots.
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  1. The average person doesnt have any hardware that needs that much bandwidth, except for a graphics card.
  2. GI_JONES said:
    The average person doesnt have any hardware that needs that much bandwidth, except for a graphics card.

    But does it cost any more to manufacturers to be fully compliant with the PCI-e standard?
  3. Confusion, are you saying that if I stuck a PCIe x1 card in the PCIe x16 slot that it wouldn't work somehow ??? Didn't know this.
  4. tsnor said:
    Confusion, are you saying that if I stuck a PCIe x1 card in the PCIe x16 slot that it wouldn't work somehow ??? Didn't know this.


    Yes, many consumer-level motherboards restrict the x16 slots to video cards only.
  5. Can you point me to one, I'd like to read the manual. Was just planning to put a Sata controller in the only PCIe slot in an older amd pc, so am very interested in learning if it might fail before i buy.
  6. tsnor said:
    Can you point me to one, I'd like to read the manual. Was just planning to put a Sata controller in the only PCIe slot in an older amd pc, so am very interested in learning if it might fail before i buy.


    Your best bet would be to ask the manufacturer. Various models of motherboard (even of the same brand) may or may not support anything other than a graphics card in the x16 slot.
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