P9D-I uses C222 PCH, which has a USB bug that needs to be solved by Intel. Therefore, Intel has released C2 stepping to state that this motherboard is free from the USB bug and motherboard manufacturers are allowed to advertise their motherboard with the newer revised chipset.
P9D-I supports a single PCI-e 3.0 x16 slot, has 2 DDR3 DIMM which allows up to 16GB of unbuffered/ECC RAM, dual Gigabit Ethernet ports, 2 x SATA 6Gbps ports, 2 x SATA 3Gbps ports and support for RAID 0/1/5/10. At the Back IO area, it has 2 x USB 3.0 ports.
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