ATTO Disk Benchmark
ATTO is another synthetic disk benchmark that measures transfer speeds across a specific volume length. It measures raw transfer rates for both reads and writes and graphs them out in an easily interpreted chart. We chose .5kb through 8192kb transfer sizes and a queue depth of 10 over a total max volume size of 256MB. ATTO's workloads are sequential in nature and measure raw bandwidth, rather than IO response time, access latency etc. This test was performed on blank, formatted drives with default NTFS partitions in Windows 7 x64.
In our ATTO testing, we see an interesting reversal. ATTO presents its workloads with a rather shallow queue depth of 10, which is the highest setting you can choose and what we always test at for SSDs. Here the P320h shows substantially more headroom in Write performance but levels off at 1.5GB/sec for Reads. For Writes, we realized 1.9GB/s on average which did show the drive dropping in below the OCZ Z-Drive R4, but still within striking distance.