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Our testing uses a Samsung 840 Series SSD.
Native SATA 6Gb/s ports on the Asus X79-Deluxe motherboards provide restriction-free SSD performance. The only disappointment is that the X79 Express chipset only provides two SATA 6Gb/s connections, with the other four operating at 3Gb/s speeds.
Seemingly using a PCI-E 2.0 x2 connection, the SATA 6Gb/s ports operating from Marvell’s 88SE9230 controller also manage to provide enough bandwidth to ensure that SSD performance is not noticeably hampered. We only had one high-speed SSD available for testing, so what happens when three or all four ports are used remains unclear. We would assume that drive throughput would drop due to the saturation point of a PCI-E 2.0 x2 connection being approached or surpassed.
ASMedia’s SATA 6Gb/s ports provide the same circa-400MB/s throughput limitations that we are accustomed to seeing the ASM1061 chipset enforce on Z87 motherboards. When used on an X79 motherboard, though, they still offer better throughput than the chipset’s native SATA 3Gb/s ports, so are arguably more useful than the ones used on Z87 parts.