Performance in Intel IOMeter
Sequential Read and Write Patterns
As usual we are going to start with sequential read and write tests. In this test IOMeter is sending a stream of read and write requests with a request queue depth of 4. The size of the requested data block is increased each minute, so that we can see the dependence of the SSD linear read/write speed on the size of the data block. This test is indicative of the maximum speed the tested SSD can achieve.
All obtained results have been split between the two diagrams for a more illustrative picture:
As we have already mentioned above, 250 GB Intel 510 copes really well with streaming loads. Its linear read speed exceeds 500 MB/s on large data blocks! Smaller Intel SSD is a little behind its elder brother because of fewer flash-memory chips onboard.
Crucial m4 SSD with the same controller as Intel 510 yields to the latter in linear reads. Moreover, it even yields to its predecessor, Crucial C300, on smaller data blocks.
SATA-300 tests didn’t reveal anything super-exciting: all SSDs were held back by the insufficient maximum bandwidth of the interface.
Among OCZ SSDs, the leadership goes to vertex 3 on SATA-600, just as we have expected :)
And quite naturally, it was the drive with the largest storage capacity (and the biggest number of chips). Although it yields to its younger brothers on small data blocks. All three Vertex 3 drives surpassed the ultimate 500 MB/s threshold on large data blocks, but didn’t hit the declared 500 MB/s mark.
Intel 510 with 250 GB capacity shines during sequential write tests. Its younger brother falls farther behind this time than with reads. Crucial m4 works best of all on small data blocks, but yields to Intel 510 250 GB on larger blocks.
It is interesting that Vertex 3 SSDs failed to compete successfully against Intel 510 during writes. The best one of them has barely hit 300 MB/s. It is also interesting to check out the performance of models with different storage capacity. The 480 GB model takes longer to speed up and then simply jumps to its maximum speed. The 240 GB model, on the contrary, starts faster, and then little by little reaches the maximum speed.
The 120 GB model at first behaves just like the 240 GB one, but by 4 KB data chunk size it has already reached its maximum speed. It must be the few memory chips that affect this result again.
Also, I would like to draw your attention to the overwhelming superiority of Vertex 3 SSDs over the previous-generation Vertex 2 (modification E).