Samsung 840 EVO mSATA 1TB SSD Review

I/O Performance

There is little point of having an SSD drive that has
blazing sustained reading and writing speeds, if the drive can’t handle reading
and writing of small random files. If you intend to use your new SSD drive to
store and run your operating system, then the drive must be able to cope with
the many small random files that Windows will write to the drive continually.
So I feel it is very important to test how many of these random files that a
drive can handle in one second. I believe that anything over 1,000 I/O’s per
second would be enough for most users running a consumer grade mainstream PC,
and should provide a smooth running system. But obviously, the more I/O’s that
a drive can handle, the faster the drive will feel and leave more headroom for
those huge multitasking sessions that users sometimes engage in.

IOMeter is probably the most versatile of all the synthetic
benchmarks. Its ability to be configured to generate a multitude of different
I/O traffic is unmatched. Another great feature of IOMeter, is the capability
to test any storage metric that you can think of, providing you know how to
configure the assignments. The reviewer also has complete control over things
like queue depth, block size, whether the traffic is random, sequential, or
even a mixture of both.

Partition alignment and sector boundaries

Windows 8.1, Windows 7, and Windows Vista will automatically
align a partition to 4k boundaries during partition creation, Windows XP won’t.
It is imperative that an SSD’s partition is aligned. Windows XP is also
restricted to sector boundaries, while Windows 7 and 8 will use 4k boundaries
if they can. The Samsung 840 EVO mSATA SSD is 4k boundary aware, and will use
these boundaries if possible. Of course it will also remap LBAs for compatibility
with the sector boundaries so that the drive can be used with Windows XP.

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IOMeter allows us to set the sector boundaries for
conducting the tests, and I have therefore set the sector boundaries at 4K,
which means the IOMeter tests are valid for Windows 7, Windows 8, and Windows
Vista users. XP users will not be able to obtain such results.

I will provide a screenshot of the tests on the review drive
for those of you who like to see the actual test result. All the comparison
drive results are represented in the form of graphs.

If any of you would like to see a screenshot from any
IOMeter test on a particular drive, please feel free to request one, and I’ll
post the screenshot in the forum thread.

All the IOMeter tests create a 10GB data set on the target
drive, and each test is run for a duration of 3 minutes.


IOMeter 4K random write test with repeating data.

The first test involves creating continual 4KB random files
on the target drive with IOMeter. I use a 4KB file size, as it is believed that
Windows will create and modify many of this size of file constantly in the
background during a typical Windows session. It is said that most 4K random
writes take place at a queue depth of only one, and I have been requested to
include this test in my reviews.

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Queue depth 1

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 4K random write (QD 1)

Samsung 840 EVO mSATA 1TB SSD Review

At 147.51 MB/s the Samsung 840 EVO mSATA SSD is excellent, and
finishes this test in fourth place.

Our next test involves creating continual 4KB random files
on the target drive with IOMeter. I use a 4KB file size, as it is believed that
Windows will create and modify many of this size of file constantly in the
background during a typical Windows session. I will use queue depths of 4 and
32 for these tests.

Queue depth 4

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD (QD 4)

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Samsung 840 EVO mSATA 1TB SSD Review

At a queue depth of 4, the Samsung 840 EVO mSATA SSD delivers
outstanding performance, and finishes this test in first place.

Queue depth 32

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD (QD 32)

Samsung 840 EVO mSATA 1TB SSD Review

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At 370.76 MB/s, the Samsung 840 EVO mSATA 1000GB SSD has
outstanding performance, and finishes this test in sixth place.


IOMeter 4K random write test with fully random data.

This test is exactly the same as the test above except that
the test data is fully random and is therefore much more difficult to compress.
This test was requested as SandForce based SSDs gain a lot of performance by
being able to compress data on the fly. While the above test shows the
SandForce based SSDs in a best case scenario, the following test will show the
SandForce based SSDs in a much more realistic scenario.

Queue depth 4 with fully random data

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 4K random write (QD 4 with fully random
data)

Samsung 840 EVO mSATA 1TB SSD Review

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The Samsung 840 EVO mSATA SSD pays no penalty when writing
data which is incompressible, and with 363.34 MB/s it finishes the test in
first place.


4K random write queue depth profile

For this test I used various queue depths from 1 – 32 to
give you an idea how this SSD performs at different queue depths. For a normal
desktop user, with lightweight multitasking, the queue depth will rarely rise
above 2. For heavy multitasking, the queue depth is unlikely to rise above a
value of 8.

The results are shown below.

Samsung 840 EVO mSATA 1TB SSD Review

As we can see, the Samsung 840 EVO mSATA SSD has very
impressive performance at low queue depths, and at a queue depth of four it is
the fastest SSD.

Below I present a table of the results in more detail.

Samsung 840 EVO mSATA 1TB SSD Review


IOMeter 4K random read test.

If there are many 4k files created, then that must also mean
that many 4k files need to be read. This test measures 4k reading performance.

It is said that most 4K random reads take place at a queue
depth of only one, and readers have requested that I include this test in my
reviews.

Queue depth 1

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 4K random read (QD 1)

Samsung 840 EVO mSATA 1TB SSD Review

In this test the Samsung 840 EVO mSATA SSD is outstanding
and finishes in first place.

Queue depth 4

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 4K random read (QD 4)

Samsung 840 EVO mSATA 1TB SSD Review

Once again the Samsung 840 EVO mSATA is outstanding, and
finishes this test in second place.

Queue depth 32                             

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 4K random read (QD 32)

Samsung 840 EVO mSATA 1TB SSD Review

At a queue depth of 32, the Samsung 840 EVO mSATA SSD once
again has outstanding performance, finishing this test in third spot.

4K random read queue depth profile.

This test shows how the review drive scales with increasing
queue depths.

Samsung 840 EVO mSATA 1TB SSD Review

Below I present a table of the results in greater detail.

Samsung 840 EVO mSATA 1TB SSD Review

If we look at the Samsung 840 EVO mSATA SSD 4K random read
performance in detail, at low queue depths the performance is outstanding, but
it doesn’t stop there, and the 840 EVO mSATA SSD scales well all the way up to
a queue depth of 32.


IOMeter 512KB sequential write test with repeating data.

Sequential writing performance is also very important; in
this test sequential writing performance is measured.

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 512K Sequential write with repeating data

Samsung 840 EVO mSATA 1TB SSD Review

The Samsung 840 EVO mSATA SSD shows an excellent turn of
speed, finishing this test in second place, and is only marginally slower than
the fastest SSD in this test.

512K sequential write – Queue depth profile

While most sequential writes will rarely rise above a queue
depth of two, it has been noted from SATA analyzer traces that with more
demanding tasks, queue depths can rise very close to a queue depth of four.
This is why I now include queue depth profiles for sequential read and write.

Please note that in the following graph, I do not have the
lowest possible score set at zero. This is purely to allow the graphs to be
easier to read, but starting with a lowest possible score other than zero,
gives the impression that there are large differences between competing SSDs with
regard to performance, so please keep this in mind.  

Samsung 840 EVO mSATA 1TB SSD Review
512K sequential write – Queue depth profile

Below I present a table of the results in more detail.

Samsung 840 EVO mSATA 1TB SSD Review

The Samsung 840 EVO mSATA SSD series reaches peak performance
at a queue depth of three, where it manages a very impressive 534.05 MB/s.

IOMeter 512KB sequential write test with fully random data.

This test is almost exactly the same as the test above
except that the test data is fully random in nature. This test was requested as
SandForce based SSDs gain a lot of performance by being able to compress data
on the fly. While the above test shows the SandForce based SSDs in a best case
scenario, the following test will show the SandForce based SSDs in a more realistic
light. In the real world, the data is neither 100% incompressible nor 100%
compressible, it is somewhere in between. So please keep this in mind.

 

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 512K sequential write with fully random data

Samsung 840 EVO mSATA 1TB SSD Review

With data that is not so easy to compress, the SandForce SF-2281
based SSDs take a big performance hit, whilst the Samsung 840 EVO mSATA SSD
returns an extremely impressive 533.17 MB/s, and finishes this test in third
place.


IOMeter 512KB sequential read test QD1.

This test measures 512k sequential reading performance at
very low queue depths.

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 512K sequential reading test (QD 1)

Samsung 840 EVO mSATA 1TB SSD Review

The Samsung 840 EVO mSATA 1000GB SSD has outstanding
sequential reading performance at very low queue depths, finishing in second
place, and is only marginally slower than the fastest SSD in this test.

IOMeter 512KB sequential read test (dual threaded).

This test measures 512k sequential reading performance QD2.

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – 512K sequential reading test (QD 2)

Samsung 840 EVO mSATA 1TB SSD Review

At a more realistic queue depth the Samsung 840 EVO mSATA
1000GB is still showing excellent sequential reading performance, and finishes
this test in fifth place.

512K sequential read – Queue depth profile

While most sequential reads will rarely rise above a queue
depth of two, it has been noted from SATA analyzer traces that with more
demanding tasks, queue depths can rise very close to a queue depth of four.
This is why I now include queue depth profiles for sequential read and write.

Please note that in the following graph, I do not have the
lowest possible score set at zero. This is purely to allow the graphs to be
easier to read, but starting with a lowest possible score other than zero,
gives the impression that there are large differences between competing SSDs with
regard to performance, so please keep this in mind. 

Samsung 840 EVO mSATA 1TB SSD Review
512K sequential read – Queue depth profile

Below I present a table of the results in greater detail.

Samsung 840 EVO mSATA 1TB SSD Review

The Samsung 840 EVO mSATA SSD reaches maximum sequential
reading performance at a queue depth of four, where it achieves an outstanding 554.24
MB/s.


IOMeter Workstation simulation (outstanding I/Os = 64).

When running applications you will find that there is a
mixture of small random files and larger sequential files, being created and
read. Not only that, it isn’t just one file at a time. In this test I measure a
simulated workstation pattern, with a queue depth of 64 (threaded).

Samsung 840 EVO mSATA 1TB SSD Review
Samsung 840 EVO mSATA 1000GB SSD – Workstation simulation

Samsung 840 EVO mSATA 1TB SSD Review

The Samsung 840 EVO mSATA 1000GB SSD has excellent
performance with a workstation based workload. It isn’t as fast the SSDs with
the Indilinx Barefoot 3 SSD controller, but is much improved over the Samsung
MDX controller found in the older 840 Pro.


Summary

All in all, the Samsung 840 EVO mSATA 1000GB SSD has
performed extremely well in our IOMeter tests.

 

Now let’s head to the next page where we will look at how
the Samsung 840 EVO mSATA SSD series SSD performs using a new benchmarking
application….

 

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