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HD Tune — Transfer rates
HD Tune lets us present transfer rates in a couple of different ways. Using the benchmark's "full test" setting gives us a good look at performance across the entire drive rather than extrapolating based on a handful of sample points. The full test gives us fodder for line graphs, which we've split up by drive maker. You can click the buttons below each line graph to see how the Vertex 450 compares to its rivals.


The Vertex 450 gets off to a slow start. Although its sequential read rate is only slightly lower than that of the Vector, all of the OCZ SSDs lag behind their competition.


Things look better for the Vertex 450 in the sequential write speed test. The drive still trails the Vector, but it sits in fifth place overall. Check out the line graphs for some of the slower SSDs, though. The drives based on SandForce and LAMD controllers experience huge transfer rate spikes at regular intervals.

HD Tune runs on unpartitioned drives, with no file system in place, which might explain the spikes on some of the SSDs. For another take on sequential speed, we'll turn to CrystalDiskMark, which runs on partitioned drives. We used the benchmark's sequential test with the default 1GB transfer size and randomized data.

In CrystalDiskMark, most of the SSDs hit higher speeds with reads than they do with writes. The reverse is true for the Vertex 450, whose write rate is 19MB/s higher than its read speed.

The Vertex 450 looks particularly strong in the write speed test, where it's wedged between the Vector and the Vertex 4 in third place. While its rank in the standings is much lower in the read speed test, the Vertex 450 still hits 500MB/s. That speed puts the drive just 9% short of the leaders.