The Plextor M3 (256GB) Review
by Kristian Vättö on April 5, 2012 3:05 AM ESTAS-SSD Incompressible Sequential Performance
The AS-SSD sequential benchmark uses incompressible data for all of its transfers. The result is a pretty big reduction in sequential write speed on SandForce based controllers, while other drives continue to work at roughly the same speed as with compressible data.
Plextor M3 does well in incompressible sequential speeds as well. Its incompressible sequential read speed is average in our chart, but the difference between most SATA 6Gbps SSDs is only a few percent—nobody is significantly faster here. Incompressible sequential write speed is the best we've seen on a Marvell based SSD, but the Samsung SSD 830 and OCZ Octane retain their crowns.
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jwilliams4200 - Thursday, April 5, 2012 - link
And still you are avoiding the issue, which is your reviews have been stating that Sandforce SSDs have better steady-state performance than other SSDs like the Plextor M3, when you have no objective test results to back up such statements.I provided links to two other reviews that showed that the Plextor M3 has substantially better steady-state performance than several Sandforce SSDs. Those reviews (mostly) used the recommendations in the industry standard SNIA SSD test protocols.
All you have is arbitrary measurements, and NOT EVEN THE SAME TESTS RUN ON the Plextor M3 and Sandforce SSDs, and you make the claim that Sandforce is better. That is really not at all credible.
Such misleading states are doing an injustice to your loyal readers. Please do the right thing and correct your misleading claims about the relative steady-state performance of Sandforce SSDs, and also start work on developing an objective, consistently-applied steady-state test for future reviews.
Anand Lal Shimpi - Thursday, April 5, 2012 - link
Neither of the reviews you linked to provided steady state data for client workloads.Keep in mind that we run a ton of data internally that shapes our conclusions.
Here's a chart of high queue depth, steady state performance (sequential precondition, 4KB random write QD32):
http://images.anandtech.com/graphs/graph5719/45462...
The precondition is with incompressible data (iometer 1.1.0-rc1, fully random data pattern) as is the 4KB random write pass.
I'm not sure how others measure steady state random write but most controllers, with standard 7% spare area, fall off significantly after being exposed to random writes for an extended period of time.
Take care,
Anand
jwilliams4200 - Saturday, April 7, 2012 - link
The reviews I linked to follow the industry-standard SNIA guidelines for measuring steady-state performance, at least, an abbreviated version of the guidelines.In contrast to anandtech.com, which has completely arbitrary non-random workloads, in violation of the SNIA guidelines. Even worse, anandtech.com runs different tests on Sandforce SSDs than on non-Sandforce SSDs, and then claims that one SSD is better than another based on the results of different tests!
That is highly misleading and doing an injustic to your readers. anandtech.com really needs to do the right thing here.
rw1986 - Friday, April 6, 2012 - link
Jwilliams -- can you offer any supporting evidence to your claim that the Everest 2 is a "rebadged Marvell 88SS9187"? You mention this in several threads but you have not offered any evidence to support that notion...why should we believe you?jwilliams4200 - Thursday, April 5, 2012 - link
For those who are not familiar with the SNIA SSD testing protocols and specifications:http://www.snia.org/tech_activities/standards/curr...
http://www.snia.org/forums/sssi/pts
kyuu - Friday, April 6, 2012 - link
Yeah, we get it. Thanks.Myself, I think that Anand's finding on low write amplification on the Sandforce drives after long-term, real-world usage is more important, and more relevant, than some arbitrary and artificial benchmark standard. Just because some organization says such and such doesn't mean that any alternative is automatically bunk, or that reviewers aren't credible if they don't follow their procedures to the tee.
jwilliams4200 - Saturday, April 7, 2012 - link
Actually, it does mean that reviews are not credible if they don't follow the appropriate SNIA SSS guidelines. The SNIA SSS test specifications were developed by contributors from more than 20 companies in the industry and were carefully reviewed and compiled to form an objective standard for characterization of the performance of solid state storage devices.The reviews from anandtech are not credible at all, because they do not follow any objective standards at all, let alone the SNIA SSS protocols. Anand even admitted that they do not even run the exact same tests on all SSDs. This makes the results completely arbitrary and unreliable.
LokutusofBorg - Saturday, April 7, 2012 - link
You're a walking, talking example of logical fallacies. And you lost all credibility when you claimed the Vertex 4 is a Marvell controller without proof.Anand has been setting the bar for SSD analysis and testing for years now, and you suddenly come into a comments thread and start sounding the warning that his tests are flawed?
The TRIM/torture tests in every review obviously don't try to compare SSDs against each other. All other tests are objective and run the same on each SSD being compared in the graphs. Anand clearly stated this, and you deceptively or ignorantly misinterpreted what he said. Anybody with half a brain reading these comments can see that you need to spend less time typing and more time reading.
jwilliams4200 - Wednesday, April 11, 2012 - link
http://www.anandtech.com/show/5741/ocz-confirms-oc...Bobsy - Thursday, April 5, 2012 - link
Am I glad to see these comments about Plextor being well-known and highly reputable. I remember upgrading my 486 DX2-66 computer with a Plextor optical drive (4X read-only) that I had paid $400. Plextor hardware was leaps and bounds ahead of anything else at the time. The opening comments from the author made me smile and it was obvious that the author was a young person. It is true that we have not heard about Plextor much in quite some time, at least not in terms of their products being the best.