October 25, 201015 yr Yeah, I think those specs are confusing as well. Translated in to plain english, they are saying: The motherboard has one PCIe x16 slot that can operate at x16, x8, or x4 speeds. The motherboard also has a PCIe x4 slot that can only operate at x4 speeds. However, this slot physically looks like an x16 slot (but won't operate at those speeds). So you can run two PCIe x4 cards, one in each slot. Not trying to be picky, but think it is important to know that "speed" is not the difference between the x1, x4, x8 and x16 slots. They all run at exactly the same speed. The difference is the WIDTH. A x1 is ONE lane, an x4 is FOUR lanes, an x8 is 8 lanes, and an x16 is 16 lanes. More lanes means more data traveling in parallel, but not at a faster speed. Quite true, but to the end user what really matters is speed (or how fast it feels). In this case, the higher numbers are 'faster' (meaning parity check times will be lower) no matter how the hardware actually works.
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