Real-World File Copy Performance
We ran two sets of file copy tests to compare the various controllers and hard drives. Our initial data set -- a 2GB directory of mixed files -- was completely unaffected by any of the various settings. Once we swapped out our small files for a 26GB directory of encoded AVIs, we saw a moderate performance difference between normal BOT transfer and UASP/Turbo mode, at least in certain cases.
We ran each file copy multiple times, but rebooted the system between each iteration to prevent Windows' various optimization tricks from skewing the results. We also Secure Erased the drive between controllers to keep the SSD fresh. The "Intra" tests in this suite refer to copying files from one location to another on the drive.
Here's how the data breaks down. First up -- our Corsair Force 3 SSD and the Asmedia 1042 controller.
Since this test wasn't particularly illuminative, we dropped it for the HDD comparison. Here's the VelociRaptor and Caviar green breakout, again on the Asmedia 1042.
Did you notice that the WD VR drive is actually faster than the Force 3 in both the initial data copy and the intra-drive copy? So did we. It may be related to the asynchronous nature of the SSD's Flash; asynchronous dives transmit and receive data according to a timed pulse rather than on the rising and falling edges of their clock.
Here's the Intel controller's before-and-after when using the Corsair SSD.