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Random and Sequential Read/Write

We use Anvil's Storage Utilities 1.0.51 to measure random and sequential ref and write speeds. The synthetic benchmark integrated into this software suite provides a great overview of the products by experimentally checking out a wide variety of speed characteristics of the tested SSD.

The results you see here refer to the FOB (fresh out-of-box) non-degraded SSD performance. Moreover, we use incompressible data, which is formally the least favorable scenario for the LSI SF-2281 controller that employs on-the-fly data compression. Our tests show, however, that in today’s world when the data may only be partially compressed and the utilized flash memory has high-speed synchronous interface, the compression algorithms do not have a big effect on the real-life performance of SSDs with SandForce controllers. Therefore, we gave up the idea of testing SandForce-based SSDs with compressible data: These results would be exclusively artificial in nature and wouldn’t have any practical value for us today.

It’s interesting to watch the SanDisk Ultra Plus perform in the synthetic benchmarks. Despite its 4-channel design, it is as fast as the other modern SSDs. The reduced number of controller channels doesn’t affect the read speed of the new drive as its performance is limited either by the SATA 3 interface (in the case of sequential reading) or by the controller (in the case of random reading). As a result, the SanDisk Ultra Plus is comparable to the Plextor M5 Pro, which uses an 8-channel Marvell controller, when reading sequentially or randomly with a short request queue. The downsides of the 4-channel access only show up at a long request queue or when reading large random-address data blocks but such loads are not typical of regular PCs.

When it comes to writing, the SanDisk Ultra Plus makes use of its nCache technology, which is expected to make up for the fewer number of controller channels. And it does. At least, the SanDisk Ultra Plus doesn’t betray its different internal design under typical real-life loads with a short request queue. It is only at a long request queue that it slows down, but such loads can hardly occur in ordinary PCs.

So we can find no problems about the SanDisk Ultra Plus if it is used for everyday rather than server applications.

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