|ASUS P8Z77-V Deluxe Benchmark Performance|
|Reviews - Featured Reviews: Motherboards|
|Written by David Ramsey|
|Monday, 23 April 2012|
Page 11 of 13
USB 3.0 Continued
In the previous section I showed how enabling ASUS' USB 3.0 Boost improved the performance of simple reads and writes. In this section I'll use Crystal Diskmark 3.0 to test the performance. Crystal Diskmark is better at measuring IOPS performance (I/O operations per second) under loads. First, let's look at the ASMedia controller. The chart on the left below is the standard USB 3.0 protocol, while the chart on the right is UASP via USB 3.0 Boost:
Again we see a substantial improvement with USB 3.0 Boost turned on. Remember, in the case of the ASMedia controller, it's switching to USB Attached SCSI Protocol (UASP). Now let's check out the Intel controller. Again, the leftmost chart is standard USB 3.0, while the rightmost chart is with USB 3.0 Boost:
Look at the bottom row of the rightmost chart here, the one labeled "4K QD32". Note that at 31.12 megabytes per second, it's less than half the 78.96 megabytes per second the Intel SSD 520 can do when connected to the ASMedia port. When the queue depth stacks up, the ASMedia controller is the clear winner; for straight linear performance, the Intel port wins.
This performance disparity is probably because USB Attached SCSI Protocol dispatches commands more efficiently than the "Turbo" protocol ASUS uses for the Intel controller. I'd guess that once Intel supports UASP on their USB 3.0 ports, we'll see the Intel controller catch up. In the meantime, if you're running a database server or something else that pounds out the IOPS, connect your USB 3.0 storage device to the ASMedia controller ports.