Toshiba OCZ VX500 512GB SSD Review

Posted 13 September 2016 15:00 CEST by Wendy Robertson

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 10, 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 Toshiba OCZ VX500 512GB 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.

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.

Queue depth 1

Toshiba OCZ VX500 512GB SSD – 4K random write (QD 1)

At 126.85 MB/s the Toshiba OCZ VX500 512GB SSD's result is very good, and it finishes this test in twelfth 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

Toshiba OCZ VX500 512GB SSD (QD 4)

At a queue depth of 4, the Toshiba OCZ VX500 512GB SSD is good, and finishes this test in twelfth place.

Queue depth 32

Toshiba OCZ VX500 512GB SSD (QD 32)

At 251.45 MB/s, the Toshiba OCZ VX500 512GB SSD is struggling a little, and finishes this test in thirteenth 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

Toshiba OCZ VX500 512GB SSD – 4K random write (QD 4 with fully random data)

The Toshiba OCZ VX500 512GB SSD pays no penalty when writing data which is incompressible, and at 248.48 MB/s it finishes the test in thirteenth 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.

As we can see, the Toshiba OCZ VX500 512GB SSD has excellent performance at low queue depths but, after it reaches a queue depth of 4, performance doesn't really increase with higher queue depths.

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


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

Toshiba OCZ VX500 512GB SSD - 4K random read (QD 1)

In this test the Toshiba OCZ VX500 512GB SSD struggles, and finishes at the bottom of the table.

Queue depth 4

Toshiba OCZ VX500 512GB SSD - 4K random read (QD 4)

At a queue depth of four, the Toshiba OCZ VX500 512GB performs much better, and is the tenth fastest SSD in this test.

Queue depth 32                            

Toshiba OCZ VX500 512GB SSD - 4K random read (QD 32)

At a queue depth of 32, the Toshiba OCZ VX500 512GB SSD gives excellent performance, and is the sixth fastest SSD in this test.

4K random read queue depth profile.

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

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

When we look at the Toshiba OCZ VX500 512GB SSD 4K random read performance in detail, at low queue depths the performance isn’t the best, but the Toshiba OCZ VX500 512GB scales exceptionally 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.

Toshiba OCZ VX500 512GB SSD - 512K Sequential write with repeating data

The Toshiba OCZ VX500 512GB SSD delivers an excellent turn of speed, finishing this test in tenth place.

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.  

512K sequential write - Queue depth profile

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

The Toshiba OCZ VX500 512GB SSD series reaches peak performance at a queue depth of four, where it manages 521.44 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.

Toshiba OCZ VX500 512GB SSD – 512K sequential write with fully random data

With data that is not so easy to compress, the SandForce SF-2281 based SSDs take a big performance hit, whilst the Toshiba OCZ VX500 512GB SSD returns an impressive 521.48 MB/s, and finishes this test in ninth place.


IOMeter 512KB sequential read test QD1.

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

Toshiba OCZ VX500 512GB SSD – 512K sequential reading test (QD 1)

The Toshiba OCZ VX500 512GB SSD has excellent sequential reading performance at very low queue depths, finishing in sixth place.

IOMeter 512KB sequential read test (dual threaded).

This test measures 512k sequential reading performance QD2.

Toshiba OCZ VX500 512GB SSD – 512K sequential reading test (QD 2)

At a more realistic queue depth the Toshiba OCZ VX500 512GB is still showing excellent sequential reading performance for an SATA SSD, and finishes this test in seventh 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. 

512K sequential read - Queue depth profile

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

The Toshiba OCZ VX500 512GB SSD reaches maximum sequential reading performance at a queue depth of two, where it achieves an excellent 552.82 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).

Toshiba OCZ VX500 512GB SSD – Workstation simulation

The 'workstation' simulation sorts the men out from the boys, with its mixed reads and writes. This test shows how an SSD could behave with a heavy workload, in a graphics, or video workstation environment. The Toshiba OCZ VX500 512GB SSD has outstanding mixed read/write performance, and finishes this test in third spot.


Summary

All in all, the Toshiba OCZ VX500 512GB SSD has performed well in our IOMeter tests. It has excellent reading performance, and writing performance is also of a very high standard. The Toshiba OCZ VX500 512GB also has outstanding mixed reading and writing performance, which is a key factor for a mainstream consumer SSD.

 

Now let’s head to the next page where we will look at how the Toshiba OCZ VX500 512GB SSD performs using a new benchmarking application....

 

Myce.com settings

Several settings at Myce.com can be changed, they are stored in cookies, which means they will be reset if you clear Myce.com cookies

Background

Change the background to a plain color or trianglified image (similar to the default image)

No tracking features

At Myce most social media feature are done server side and impose no privacy risk to the visitor when not used. Several features use Javascript with you can turn off here

Layout

Switch to the List layout for an index with chronologycally listed news items or Grid layout for a block based layout. To see the change you need to reload the page

×