Kingston rate the DC1000M's 4K random read performance as up to 540,000 IOPS. When tested with our four threaded tests, the best result we saw was 521,583 IOPS at a queue depth of 32. After peaking at QD32 the performance slowly drops away, to finish the test runs at 464,135 IOPS at a queue depth of 512. We did a quick test at QD32 but with 8 threads and saw a peak maximum figure of 611.539 IOPS.