ConclusionThe controller should be the number one factor in your choice of SSD and our pre-selection based on our previous tests means that the 8 SSDs reviewed here all offer a very good level of performance. Of course, reducing the number of Flash chips or their density means that sequential write performance is generally a good deal lower than that for larger capacity SSDs, but this is largely incidental when considering lower capacity drives.
When it comes to reads, all these SSDs give very good performance, whether for seqential or random (particularly good) accesses. For random accesses they are even on a par with larger capacity SSDs, which means they can offer comparable applied performance.
What is our advice in terms of capacities? There is only one 32 GB SSD in the survey, the Onyx, and it will be the cheapest. If you can’t stretch to anything else, this SSD has no major faults, apart from its capacity of course. Looking at 40 GB, you have the choice between the Intel X25-V and the SandForce SF-1200 (Corsair F40, Agility 2, Vertex 2 and G.Skill Phoenix which are all based on this controller). The SandForce SSDs give better all-round performance, while sequential write speeds for the X25-V are particularly low. Once again, this isn’t particularly important, but 42 MB/s is lower than we have seen for some time! On the other hand note that the figures given on product info for the SandForces are for highly-compressible data: when it comes to compressed files, they are far from 220-240 MB/s, scoring closer to 70 MB/s.
For the 60 to 64 GB capacity models, you have the choice between the Indilinx, used on the Onyx 64, the SandForce, on the Corsair F60, and the Marvell, on the Crucial C300. The M225 isn’t sold at this capacity. The Onyx 64 is very agressively priced, on a par with the 40 GB models. The Crucial C300 is the most expensive, but gives highest performance. Although the F60 sometimes gives higher write speeds, the C300 gives better read performance and of course this is the most common usage.