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.
OCZ laid heavy claims on their low queue depth IOPS and 4k write performance and CDM helps us see that. The single command 4K read on Vertex 4 is about the same as Vertex 3, around 35MB/s. With a depth of 4 the V4 takes off and doubles the 4K 4 command read in the 240/256GB class and nearly doubles the same read in the 480/512GB class.
CDM also uses incompressible data so we are going to use the sequential read numbers in this test this time. Incompressible data is an area that SandForce drives struggle with due to their architecture. Vertex 4 easily outperforms Vertex 3 in these tests. What we have not been able to determine is at what queue depth CDM runs the sequential tests at. This is important based on what we've already discussed and what we'll talk extensively about in our final thoughts.
The OCZ Vertex 3 480GB shot up red flags as soon as we started building out chart. The 4K and 4K QD:4 write tests just about gave us a heart attack. We've retested this drive on three different machines and go back numbers in all tests that are within 5% of what we are publishing. We also know another reviewer scored nearly identical numbers with their 480GB Vertex 3. Our Vertex 3 480GB uses a standard SF-2281 controller with the same density 25nm flash as our Vertex 4 512GB sample, both with 16 chips. We've heard that several manufactures produced 480GB drives with the SF-2282 controller (8-channels with 16 byte lanes) and 32, 25nm flash chips. We have another Team SandForce 512GB (0 Provision) drive on the way for review so we'll know more about this in a couple of days. For now though, the anomaly of the low 4K performance is going to help us in another test later on. It's funny how things like this work out.
Both of our Vertex 4 SSD's show improvements over their previous generation counterparts in 4K single command writes. When we get to a queue depth of 4 Vertex 4 goes all SSDs Gone Wild, Spring Break 2012 style. Maybe Marti Gras is more appropriate because Vertex 4 just lets it all hang out there. Get out the necklace beads.
Since we can't say with certainty what is going on with the V3 480GB let's focus on the 240/256GB models and compare. CDM uses incompressible data so V3 is at a disadvantage. All of the 4K writes go to V4, but when the commands are stacked, the lead increases to a very large amount.