Futuremark PCMark 7
PCMark 7 incorporates an individual disk subsystem benchmark which is based on real-life applications. It reproduces typical disk usage scenarios and measures how fast they are performed. Moreover, the disk access commands are not reproduced one by one, but with pauses necessary to process the data, just like in real life.
The benchmark reports an overall disk subsystem performance rating as well as the data-transfer rate in particular scenarios. Take note that the speed in these scenarios is rather low due to the pauses between input and output operations. In other words, PCMark 7 shows you the speed of the disk subsystem from the application’s point of view. Rather than the pure performance of an SSD, this benchmark will show us how good it is in practical tasks.
We ran PCMark 7 on used SSDs, i.e. in the state they are going to have most of the time in real-life computers. Their performance is thus affected not only by their controller or flash memory type but also by the internal algorithms that fight performance degradation.
The overall PCMark 7 score can serve as an intuitive benchmark for users who want to know the relative standings of SSDs in terms of performance but do not care about learning the technical details. Judging by the results, the RAID0 is overall faster than the single SSD of the same capacity. Considering that a computer’s disk subsystem is mostly used for reading in typical scenarios, these results seem to be true to life.
You may want to take a look at the individual subtests. The gaps between the contestants are quite impressive in some of them.
There are scenarios that are very difficult for RAID0s based on SSDs with second-generation SandForce controllers. It is when the disk subsystem has to process a lot of small data blocks: Gaming and Windows Defender.