The next software we used was the ATTO Disk Benchmark. The tool measures storage systems performance with various transfer sizes and test lengths for reads and writes. The benchmark performs file transfers ranging from 0.5 KB to 8192 KB. ATTO can be adjusted to do overlapped I/O, in a variety of queue depths. We tested the SSD using the benchmark's default settings, using 256KB file length performance and QD4. ATTO probably gives the most accurate results for compressible read and write data.

In the write test, the OCZ Vector 256GB SSD reached over 530MB/s with block sizes larger than 512 KB. Reading was even faster at around 550 - 560 MB/s , again with 522KB or larger files. That's a great performance for the drive and very close to what we expected to see after reading OCZ's official specs.

The drive's strengths are easily identified in the following graphs, which show its performance with small 4K files and large 2MB files, in both read and write operations.

Reading of 4K files was awesome at 289.9 MB/s, with the Vector drive to easily reach the top of the SSDs we have tested so far. Writing of such small 4K (compressible) files was also very fast (315.7MB/s) - a performance close to what we had measured with a Vertex 4 and Agility 4 SSDs:

Going further to larger file transfers, the Vector 256GB SSD is among the fastest you can find for both reading and writing, effectively competing with Kingston's SSD (read, write) and the Vertex 4 (write):