Version and / or Patch Used: 3.0 Technical Preview
Developer Homepage: http://crystalmark.info
Product Homepage: http://crystalmark.info/software/CrystalDiskMark/index-e.html
CrystalDiskMark is a disk benchmark software that allows us to benchmark 4K and 4K queue depths with accuracy.
* Sequential reads/writes
* Random 4KB/512KB reads/writes
* Text copy
* Change dialog design
* internationalization (i18n)
Note: Crystal Disk Mark 3.0 Technical Preview was used for these tests since it offers the ability to measure native command queuing at 4 and 32.
We've seen a lot of really good SSDs and for the most part SandForce controllers have lead the pack. In the 120GB capacity size though some of the newer products based on Marvell technology have started to outperform SandForce at their own game. In this test we see the 4K performance and the VisionTek Racer has a hard time keeping up with the 4K performance from newer Marvell based drives.
If you are shopping for a 240/256GB model, the VisionTek Racer fairs much better in the 4K tests when compared to the Marvell drives.
The 4K write test with incompressible data is a little tricky for those not familiar with SSDs. I expect to have a lot of mainstream type users read this article so I'll do my best to take off my enthusiast hat.
SandForce controllers are very complicated, they manipulate data to keep performance high and reduce the amount of data being written to the flash. This increases flash life so your SSD will last for many, many years. One method SandForce employs is data compression. If you have a file that can be compressed, the controller reduces the size of the file in real-time and writes less data to the flash than what goes in. Think of it as deflating a beach ball so you can store it in the closet. When you need the beach ball again it passes through this magical machine that inflates the ball at the exact same time you cross the closet door plane.
Incompressible data or data that is already compressed is like a bowling ball. It takes up much more space in the closet and if you crush it you no longer have a bowling ball. SandForce controllers can't crush bowling balls and reconstruct them... not even with super glue.
So, with that explained, let's look at the chart. There are several bars for each product, but most consumers and mainstream users can disregard the top bar because it is at a high queue depth, an enterprise load that you will never use surfing the web or even light to medium multi-tasking. The green bar in the middle of each group is your important 4K write performance, but this is less important because it uses 4K incompressible data. You operating system and programs write a lot of 4K data, but much of it is incompressible.
The two orange bars are where your incompressible data, pictures, music and such are often found. These files are large and are written sequentially. The larger the file, the longer it takes to be written and with SandForce based drives at this capacity size, newer Marvell controllers tend to transfer much faster.
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