Not all 2nd PCIe "x16" Slots On P55 Motherboards Created Equal?
An analysis of the tech specs of the 30 LGA1156 motherboards from ASRock, ASUSTeK, Gigabyte, MSI and Intel with a second x16 PCI-Express port shows up an aspect of the spec that may go unnoticed at first but which is nevertheless important. On 12 of these motherboards the second x16 PCI-Express is not connected from the LGA1156ís processor to the PCI-Express controller with 8 lanes (the 1st PCI-E port is 8 lanes) but with 4 to the P55 Express.
Whatís more the lanes linked to the LGA1156 processor function at 5 GT/s and those linked to the P55 at 2.5 GT/s: this means one x16 PCI-Express port at x4 with the P55 functions at 1 GB/s in each direction as against 4 GB/s when at x8 with the processor!
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