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.
The consistency of the performance is not very special; with a standard deviation of nearly 13,000 iops Goodram does not manage to keep pace with the top.