OCZ Vertex 4 256GB SSD Review

Crystal Disk Mark

Crystal Disk Mark measures sequential read/write speed, random 512KB, 4KB,  and 4KB Queue Depth 64 reads/writes speeds.  It also allows the data sets to be changed, which are random, 0 Fill, and 1 Fill.  We began testing our SSDs using the 0 Fill which tends to give the best overall throughput, but since we've seen a greater variety of controllers as of late, we've begun testing with the default Random data sets to show differences in controllers, and we'll report that here as well.







We also tested the default Crystal Disk Mark setting, which uses random data, shown below.


Crystal Disk Mark reveals a little bit more about how the Everest 2 controller is "geared."  We see Sequential performance essentially matching the Sandforce drives, although again we see the read speeds fall off in the 4K and 512K tests.  However, the read speeds blitz to the top in the 4K 32 Queue Depth charts, which shows us that the Everest 2 handles simultaneous workloads more efficiently.  The write speeds are also very good, and using the Random data default setting, we see that the Everest 2's write speeds handle random data sets almost exactly the same as the 0xFill, which is something that buckles the Sandforce controller, as demonstrated by the HyperX 3K 240GB SSD.


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