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USB 3.0 Performance: Two Solutions From Asus And Gigabyte

Access Time And I/O Performance

The only solution saddled with a first-generation PCIe x1 interface, Gigabyte’s eSATA controller incurs a slightly higher write latency.

A chipset-direct connection gives the P55’s native SATA interface a big boost in IOPS. This is the only place where the lowly USB 2.0 interface is somewhat competitive with higher-bandwidth third-party solutions.