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Intel X25-M V2 (Postville)
by Marc Prieur
Published on August 27, 2009

The usure of the X25-M in practice
Here is the usure of the X25-M with the new firmware. For a full recap of this phenomenon as well as the results obtained on the Vertex with the same protocol, read this article (pages 2 and 3).

Case 1: Sequential performance – Sequential access only

First of all, here are the sequential read and write speeds (in KB/s) when we carry out only this type of access (one read, one write, one read, one write, one read and a final write, each time on the whole of the SSD):

There isn’t a great variation, with read speeds around 214-209 MB/s and writes at 80 MB/s to 78 MB/s.

Case 2: Sequential performance – Random then sequential access

This time we started with a new drive (after HDD Erase) that is then “used” by writing by block of 4 KB randomly for 30 minutes. We carried out the same test as in case 1.

This time there was a significant fall in speeds with reads dropping to 193 MB/s. The fall is nevertheless slight and not as much as the fall recorded for the first generation X25-M. Moreover, after having carried out sequential writes the SSD returns to original levels of performance as of the second run.

For writes, we recorded 77 MB/s on the first run and then 78 MB/s for the next two, results that are therefore quite stable. With its original firmware the X25-M V1 dropped to 20 MB/s on this type of test!
Case 3: Random performance
Now here is an observation of the change in performance (in I/Os per second) during random writes of 4 KB files. We launch the test on a new SSD, 6 x 5 minutes, then a second time on an SSD whose cells have been previously filled sequentially.

On a new SSD, the X25-M V2 starts with a very high level of performance, more than 8000 I/Os per second as against 6500 for a V1. However it falls rapidly to 2000 I/Os before climbing back up slowly. On the V1, with the same test we finished the 6th run at 1262 I/Os; a clear improvement then.

On a used SSD, performances are of course lower with 5664 I/Os on the first run with the V2 as against 3022 for the V1. The least good result was on the 3rd run with 517 I/Os; the V1 scored 386 I/Os so once again the improvement is there for all to see.
The test
For this test, we compared the Intel X25-M V2 160 GB with different models:

- Intel X25-M V1 80 GB
- OCZ Core V2
- OCZ Apex
- OCZ Vertex 30 & 120 GB
- Samsung PM410
- Samsung PS410
- Samsung PB22-J 64 GB
- Samsung PB22-J 256 GB
- Mtron MOBI 3500

The OCZ Core V2 represents what is “best” with the JMicron JMF602/MLC combination, with the Apex a RAID version (two SSDs in one). The Vertex is based on the most recent Indilinx controller. The Samsung SLC and MLC SSDs are in a way the references for the previous generation, and the Mtron MOBI 3500 is an interesting alternative. The Samsung PB22-Js are the new generation of Samsung SSD, here in two capacities as their specs are different. For information we also include the performances of a VelociRaptor, a 3"1/2 Samsung SpinPoint F1 640 GB drive and a 2"1/2 Samsung SpinPoint M5 160 GB.

Different measurements were taken in the course of this comparison. First of all we were interested in the “synthetic” performances of these drives: average access time, sequential speeds and I/O in random and sequential access. Next, were more practical tests, first of all involving an applicative performance index based on PC Mark Vantage and then an evaluation of writing, reading with various groups of files These groups were composed of:

- A collection of large files: 6 files (on average 2.2 GB) totalling 13.2 GB
- Medium sized: 7.96 GB of 10,480 files (each averaging 796 KB)
- Small sized: 2.86 GB of 68,184 files (each averaging 44 KB)

The source or target of reading or writing on the drive was a RAID of three VelociRaptor 150 GB drives that replace the raid of two 150 GB Raptors used in previous tests. This type of measurement is worthwhile because, while the sequential speed gives us an idea of the performance when copying large files, things can be different with smaller ones.

The test machine was based on an X38 chipset mounted on an ASUSTeK P5E motherboard while Serial ATA ports were configured in the bios in AHCI (Advanced Host Controller Interface) so that NCQ could be used, all operating with Vista SP1.

We also added new practical tests so as to provide more useful data for those who want to work out if going for an SSD over their standard hard drive is worthwhile. For this we timed various operations on an other machine based on a P5QC, QX9770, GTX 280 and 2x2 GB of DDR2-1066.

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