Device Port Testing
ATTO Disk Benchmark
To validate that the device's integrated ports were functioning correctly, we connected an OCZ Vertex 3 90GB SATA III SSD to the system and ran the ATTO Disk Benchmark against the drive. ATTO was configured to test against transfer sizes from 0.5 to 8192 KB with Total Length set to 512 MB. The SSD selected for testing has a maximum read throughput of 550 MB/s and a write throughput of 500 MB/s on a SATA III port and a maximum read throughput of 280 MB/s and a write throughput of 260 MB/s on a SATA II port.
External device testing was done against the eSATA and USB 3.0 device ports with the motherboard drivers configured for both normal and UASP operation mode for the USB 3.0 port testing. All tests were run 3 times with the highest repeatable read and write scores recorded in MB/s values.
According to various other testing sites, the real-world performance maximum of USB 3.0 peaks at 250-325MB/s on a SATA III-based adapter.
As you can see from the device performance, UASP mode makes a huge performance difference when enabled. On the ASMedia controlled USB 3.0 ports, enabling UASP mode resulted in a performance gain of over 100 MB/s during both read and write transfers. The gains on the Intel Z77 controlled ports were even better with read performance increased by an average of 150 MB/s and write performance by almost 120 MB/s. The performance of the device on the Intel controlled USB 3.0 ports begins to approach the SATA III maximum device speeds, an impressive feat for sure.
In normal mode, the device performed better than expected on the USB 3.0 ports with performance matching SATA II speeds on the ASMedia USB 3.0 ports and exceeding them on the Intel ports. The device performed as expected over eSATA with its speeds limited to SATA II device speeds by the motherboard's eSATA port implementation.