Version and / or Patch Used: 3.0 Technical Preview
Developer Homepage: http://crystalmark.info
Product Homepage: http://crystalmark.info/software/CrystalDiskMark/index-e.html
Download here: http://crystaldew.info/category/software/crystaldiskmark
CrystalDiskMark is a disk benchmark software that allows us to benchmark 4K and 4K queue depths with accuracy.
* Sequential reads/writes
* Random 4KB/512KB reads/writes
* Text copy
* Change dialog design
* internationalization (i18n)
Note: Crystal Disk Mark 3.0 Technical Preview was used for these tests since it offers the ability to measure native command queuing at 4 and 32.
4K QD1 read performance is 33MB/s on the 840 500GB. The drive scales well to QD4 at 114MB/s. At QD32 the 840 delivers 381MB/s, a rating only rivaled by the OCZ Vertex 4 and Vector (not charted).
The 4K write performance at QD1 was 127MB/s. That scaled to nearly 255MB/s at QD4, but somewhere between QD4 and QD32 the Samsung 840 lost some performance.