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Results: 128 KB Sequential Performance

OCZ Vertex 450 256 GB SSD Review: Can We Call It Vector Jr.?

Once again, we turn to Iometer to measure the most basic performance parameters.

Fantastic sequential read and write performance is a trademark of modern SSDs. To measure it, we use incompressible data over a 16 GB LBA space and then test at queue depths from one to 16. We're reporting these numbers in binary (where 1 KB equals 1024) instead of decimal (where 1 KB is 1000 bytes). When necessary, we're also limiting the scale of the chart to help readability.

128 KB Sequential Read

Just about every newer SSD ends up past the 500 MB/s mark with 8 or 16 outstanding commands. The most notable differences come into play at lower queue depths, particularly when the queue depth is one or two. Only Corsair's Neutron GTX is outside the 400 MB/s+ norm, starting at just over half of that.

OCZ's Vertex 450 doesn't crush the competition, but it does pick up another 100 MB/s from a queue depth of one to four. The company's Vector maintains a 20 MB/s lead over its Vertex 450 until the results become indistinguishable, once commands are stacked high.

128 KB Sequential Write

The Vector and Vertex both handle 128 KB writes with aplomb. They exceed 500 MB/s beyond a queue depth of two. Of the drives we're including, only the SK Hynix Memory Solutions (LAMD)- based Seagate and Corsair SSDs are much of a threat to OCZ's offerings.

It's true that the Vertex 450 isn't quite as fast. Through a queue depth of 16, though, the Vertex only trails by single digits. In other words, the two drives go neck and neck.

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