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I have a SAMSUNG 840 EVO SSD (120GB) installed on my laptop. According to the SAMSUNG website, it has 520 MB/s max read and 500 MB/s max write (sequential).

I am trying to benchmark it using CrystalDiskMark3.03b as following:

enter image description here

As you can see, the sequential Read/Write speeds doesn't make sense at all. I think even with the fastest SSD drives, it would be almost impossible to achieve 3GB/s read and write as the SATA 6Gb/s interface will limit the speed.

I have checked the specification of benchmarking software and 1MB is indeed 1000,000 bytes.

Am I missing something?

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  • Try another benchmark. I'd trust only a benchmark I've written myself. And even that might lie since you don't know what hardware voodoo happens. I guess you see just cache usage in your benchmark.
    – qwerty_so
    Mar 4, 2015 at 14:26
  • have you tried to disable the Rapid mode? Are the values now near to what you see in other benchmarks in the Internet? Mar 14, 2015 at 8:58

1 Answer 1

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You see those high values, because you use the Rapid Mode. Run Samsung's SSD Magician and disable it:

enter image description here

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