Read Bandwidth / Write Performance
For this benchmark, HDTach was used. It shows the potential read speed which you are likely to experience with these hard drives. The long test was run to give a slightly more accurate picture. We donít put much stock in Burst speed readings and thus we no longer included it. The most important number is the Average Speed number. This number will tell you what to expect from a given drive in normal, day to day operations. The higher the average the faster your entire system will seem.
For this benchmark HD Tune Pro was used. To run the write benchmark on a drive, you must first remove all partitions from that drive and then and only then will it allow you to run this test. Unlike some other benchmarking utilities the HD Tune Pro writes across the full area of the drive, thus it easily shows any weakness a drive may have.
Since we know the RD400 is PFM+ enabled we were very interested in seeing what its sequential full drive read and write performance was going to be since this feature is constantly writing the backup data / ECC to the NAND. This can have a considerable (and negative) impact upon performance.
Under normal circumstances this would result in a near stalling of performance, similar to what occurs with certain older OCZ SATA-based drives. This however is not a 'typical' OCZ SSD and the momentary loss of even 600MB/s is actually unnoticeable due to the fact its lowest point is still well in excess of what any SATA or even first gen M.2 drive is capable of. Basically, under worst case scenarios the RD400 will still offer nearly 2GB/s read and 1GB/s write performance. That is insanely fast for home users.
Now with that said the latency does also skyrocket during these brief flat line periods and this actually may be noticed by home users. OCZ really needs to tweak the firmware slightly and provide more processor cycles for I/O requests during 'emergency' PFM+ writes.
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