Samsung 840 – 250GB SSD Review

Synthetic Benchmarks

HD Tune Pro

In this benchmark I am checking sequential reading speed.

Samsung 840 - 250GB SSD Review

With an average sequential reading speed of 527.5 MB/s the Samsung
840 is showing an excellent turn of speed.


Let’s see how this compares to other recently tested SSDs in
the table below.

Samsung 840 - 250GB SSD Review

The Samsung 840 has done extremely well in the HD Tune Pro 5
sequential reading test, and is the second fastest drive.

ATTO disk benchmark

ATTO has become a standard tool for measuring the data
throughput of HDD and SSD. It measures the performance of reading and writing,
using different file sizes and block sizes.

Samsung 840 - 250GB SSD Review


The reading speed results on the Samsung 840 are extremely
impressive, topping out at over 560 MB/s, but writing speed is quite slow by
today’s standards, topping out at just over 264MB/s.

Let’s find out how this compares with other recently tested

ATTO Reading performance

Samsung 840 - 250GB SSD Review
ATTO – Reading performance at various block sizes

The Samsung 840 is not only one of the fastest SSDs when
reading, but also has excellent reading performance at different block sizes.

ATTO Writing performance

Samsung 840 - 250GB SSD Review
ATTO – Writing performance at various block sizes


The Samsung 840 certainly isn’t the fastest SSD when writing
data, but is still performing reasonably well in this test.

CrystalDiskMark 3.0

Crystal Disk Mark is quite a handy benchmarking application,
as it focuses on the file sizes that can cause a problem on a system drive.

Samsung 840 - 250GB SSD Review

As we can see from the above screenshot, sequential reading
speed is excellent, and random read and write speeds are very impressive,
especially at higher queue depths. Sequential writing speeds are however not so


AS SSD Benchmark

AS SSD benchmark is a benchmarking tool specifically
designed to test SSDs. The application tests sequential reading and writing
performance, 4K random reading and writing performance.

AS SSD benchmark also tests 4K threaded performance. This is
very exciting, as this test is the first available test that I am aware of,
that simulates how a PC operating system actually works. A modern PC and OS,
such as Windows 7/8 does not just run a single thread at a time, it runs many
threads. The AS SSD benchmark "4K 64Thrd" tests run 64 threads
simultaneously throughout the test. If this result is good, then you can be
pretty sure the drive will perform extremely well as a system drive.

After the tests complete, AS SSD benchmark derives a total
score for the drive being tested. This is based on all aspects of the test
results, and gives an indication of how the drive is performing overall.

Now let’s look at the result from the Samsung 840 SSD in the
form of a screenshot. All our other comparison drives’ results are presented in
the form of a graph.


Samsung 840 - 250GB SSD Review

Samsung 840 - 250GB SSD Review

As we can see from the AS SSD test run, the Samsung 840 has
excellent reading speeds. Writing small files with random data also delivers excellent
performance, but sequential writing speeds by today’s standards are quite low,
resulting in the Samsung 840 finishing in the middle of the pack in this test.


The Samsung 840 250GB SSD has performed well in the basic
synthetic benchmarks. Random reading and writing performance is very impressive,
and not to be outdone, sequential reading speed is excellent. However, as we
have learnt over the years, synthetic benchmarks don’t really tell us much
about how an SSD will perform in the real world. So let’s wait and see how the Samsung
840 performs in that regard a little later in this article.


Let’s head to the next page for our IOMeter test