In order to measure the performance consistency of the SSDs we once again ran a 4k random write workload with a queue depth of 32, while taking a snapshot of the drives' performance every second. We then calculated the standard deviation of the results for the interval between 1800 and 2000 seconds. A lower standard deviation means less variation, and thus a more constant level of performance. For ease of comparison, the second chart once again shows the steady state level in the same test. Keep in mind that having highly constant relative performance but very poor absolute performance is ultimately rather useless.
In terms of performance consistency we see that the Intel 600p performs particularly: in fact, the Samsung 750 Evo and Crucial MX300 SATA SSDs perform better. It is clear that the 600p is not meant for professional applications.