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Random and Sequential Read/Write

We use CrystalDiskMark 3.0.1 benchmark to test the random- and sequential read and write speed. This benchmark is convenient to work with as it can measure the speed of an SSD with both incompressible random and fully compressible recurring data. This feature is important for testing SSDs based on SF-2281/2282 controller, which tries to compress the data before writing it into memory. So, there are two numbers in the diagrams below that reflect the maximum and minimum SSD speed. The real-life performance of an SSD is going to be in-between those two numbers depending on how effective the controller data compression is.

Note that the performance tests in this section refer to SSDs in their “Fresh Out-of-Box” state (FOB). No degradation could have taken place yet.

The Kingston SSDs perform just as expected for products based on the second-generation SandForce platform. We've already tested a number of such solutions and there's nothing extraordinary about Kingston's. Running on synchronous flash, the HyperX and HyperX 3K deliver high performance. They slow down on incompressible data but not too much.

Take note that these two SSDs are identical in this test, just as promised by their specs. It proves that Intel's 25nm flash memory with different specified service life is the same in terms of performance, so the difference between the HyperX and the HyperX 3K is indeed limited to how long they are expected to last.

The Kingston SSDNow V+200 is, in its turn, a typical entry-level product. Its cheaper asynchronous flash can’t deliver high read and write speeds, so it is rather slow with incompressible data. This effect is but slightly masked by the internal algorithms of the SF-2281 controller which performs lossless compression of data prior to writing it into memory.

Comparing Kingston’s SSDs with those based on other hardware platforms, we have to admit that the SandForce is not the fastest controller anymore. Even with the new 5 series firmware the SandForce-based SSDs, from Kingston as well as other brands, are inferior to the faster solutions with Marvell 9174 and Everest 2 controllers. The write speed boost promised by SandForce with the new firmware is actually very small. There's even a negative side effect: the controller has become slower when processing 4KB data blocks in a short request queue.

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