OCZ has been at the forefront of each generation of SandForce SSD release since the debut of the SF-1500 based Vertex Limited Edition. More recently the Vertex 3 was the first client SSD to use SandForce's SF-2281 controller. Many of you have written me asking if the Vertex 3 is worth the additional cost over the Vertex 2. Given that you can pick up a 120GB Vertex 2 for $210 ($180 after rebate), and a 120GB Vertex 3 will set you back $300 flat it's tough to recommend the latter despite the performance improvements. If you don't have a 6Gbps platform (e.g. Intel 6-series, AMD 8-series) the Vertex 2 vs. Vertex 3 decision is a little easier to make, otherwise the newer, faster Vertex 3 is quite tempting.

There's another issue holding users back from the Vertex 3: capacity. The Vertex 3 is available in 120, 240 and 480GB versions, there is no 60GB model. If you're on a budget or like to plan frequent but rational upgrades, the Vertex 3 can be a tough sell.

Enter the Agility 3, OCZ's mainstream SF-2281 drive.

Architecturally the Agility 3 is identical to the Vertex 3. You get the same controller running similar firmware, and as a result post similar peak performance stats (note the use of the word peak):

OCZ SF-2200 Lineup
Specs (6Gbps) Agility 3 Agility 3 120GB Vertex 3 120GB Agility 3 240GB Vertex 3 240GB Vertex 3 480GB
Raw NAND Capacity 64GB 128GB 128GB 256GB 256GB 512GB
Spare Area ~6.3% ~12.7% ~12.7% ~12.7% ~12.7% ~12.7%
User Capacity 55.8GB 111.8GB 111.8GB 223.5GB 223.5GB 447.0GB
RAISE No Yes Yes Yes Yes Yes
Number of NAND Devices 8 16 16 16 16 16
Number of die per Device 1 1 1 2 2 4
NAND Type ONFI 1.0 ONFI 1.0 ONFI 2.0 ONFI 1.0 ONFI 2.0 ONFI 2.0
Max Read Up to 525 MB/s Up to 525 MB/s Up to 550MB/s Up to 525 MB/s Up to 550MB/s Up to 530MB/s
Max Write Up to 475 MB/s Up to 500 MB/s Up to 500MB/s Up to 500 MB/s Up to 520MB/s Up to 450MB/s
4KB Random Read 10K IOPS 20K IOPS 20K IOPS 35K IOPS 40K IOPS 50K IOPS
4KB Random Write 50K IOPS 50K IOPS 60K IOPS 45K IOPS 60K IOPS 40K IOPS
MSRP $134.99 $229.99 $249.99 $419.99 $499.99 $1799.99
Street Price ? ? $299.99 ? $559.99 $1799.99

OCZ has started publishing both peak and incompressible write performance data, but only on its product sheets. While peak performance isn't affected, incompressible performance is. Using AS-SSD as a benchmark, OCZ claims the Agility 3 is only able to muster about 200MB/s for peak sequential reads/writes on the 240GB drive - that's less than half the score the Vertex 3 gets in AS-SSD's read test. Our benchmarks, as you'll soon see, confirm the deficit.

If it's not the controller causing this, and it's not the firmware - then it's the NAND. The Agility 3 (and Solid 3) both use asynchronous NAND. What does that mean? Let's find out.

Asynchronous NAND: An ONFi History Lesson

It takes 50µs to read 8KB from a 25nm Intel NAND die. That works out to a staggering 156MB/s, from a single NAND die. Even the old 50nm stuff Intel used in the first X25-M could pull 4KB in 50µs or ~78MB/s. The original X25-M had 10 channels of NAND, giving it the ability to push nearly 800MB/s of data. Of course we never saw such speeds, as it's only one thing to read a few KB of data from a NAND array and dump it into a register. It's another thing entirely to transfer that data over an interface to the host controller.


ONFi 1.0 limited NAND performance considerably

Back in 2006 the Open NAND Flash Interface (ONFi) workgroup was formed with the task of defining a standardized interface for NAND Flash. Today, Intel and Micron are the chief supporters of ONFi while Toshiba and Samsung abide by a separate, comparable standard.

As is typically the case, the first standard out of the workgroup featured very limited performance. ONFi 1.0 topped out at 50MB/s, which was clearly the limiting factor in NAND transfer speed (see my example above). The original ONFi spec called for an asynchronous interface, as in one not driven by a clock signal. Most logic these days is synchronous, meaning it operates off of a host clock frequency. Depending on the architecture, all logic within a synchronously clocked system will execute/switch whenever the clock signal goes high, low or both. Asynchronous logic on the other hand looks for a separate signal, similar to a clock, but not widely distributed - more like a simple enable pin. In the asynchronous NAND world this is the role of the RE, WE and CLE (read/write/command-latch enable) signals.

ONFi 2.0 brought the move to source synchronous clocking, as well as double data rate (DDR) operation. Not only were ONFi 2.0 NAND devices tied to a clock frequency, transfers happened on both rising and falling edges of the clock - a similar transition was made in SDRAM over a decade ago. While ONFi 1.0 NAND was good for up to 50MB/s, ONFi 2.0 increased the interface speed to 133MB/s. Present day synchronous ONFi 2.1/2.2 NAND is no longer interface limited as the spec supports 166MB/s and 200MB/s operating modes. Work on ONFi 3.0 is being done now to take the interface up to 400MB/s.

The Agility 3

OCZ sent us a 240GB Agility 3 for review. Inside it looks like this:

You see the SF-2281 controller in its usual spot and to the right of it are eight 25nm Micron NAND devices. Flip the board over and you get another eight.

As always, we look at the part number to tell us what's going on. Micron's part numbers are a little different than Intel's but the key things to pay attention to here are the 128G (128Gbit packages, 16GB per package) and characters 11 and 14. Character 11 here is an F, which corresponds to 2 die per package (2 x 8GB 25nm die in each NAND device) while number 14 is an A, indicating that this is asynchronous NAND. To date I've only encountered 25nm synchronous (represented by the letter B) NAND, but as with any other silicon device there's always a cost savings if you can sacrifice performance.

Equipped with asynchronous NAND, the Agility 3's max performance is limited to 50MB/s per channel compared to 200MB/s per channel in the Vertex 3. The Vertex 3 doesn't come close to saturating its per-channel bandwidth so there's a chance that this change won't make much of a difference. To further tilt things in the Agility 3's favor, remember SandForce's controller throws away around 40% of all of your data thanks to its real time compression/deduplication algorithms - further reducing the NAND bandwidth requirements. When a Vertex 3 pushes 500MB/s that's not actual speed to NAND, it's just how fast the SF controller is completing its tasks. In a typical desktop user workload without too much in the way of incompressible data access, the Agility 3 should perform a lot like a Vertex 3.

Cost Savings and a 60GB Drive

I mentioned the only benefit to asynchronous NAND being a cost savings, if we go by OCZ's MSRPs the savings don't look too great at 120GB: here the Agility 3 is $229.99 vs. $249.99 according to OCZ. Street pricing tells a different (more expensive) story for the Vertex 3. The 120GB drive is more like $299.99, which would mean the Agility 3 (if its MSRP is accurate) would be a full $70 cheaper. Move to 240GB and the gap likely widens.

With the Agility 3, OCZ is also introducing a 60GB model. SandForce's NAND redundancy technology called RAISE, requires an entire NAND die be sacrificed and added to the spare area pool in the event of a NAND failure. At 25nm a single die is 8GB, which would mean a 64GB drive would lose 1/8 of its capacity just due to RAISE. Get rid of another 6.3% of the drive for the standard spare area and you're looking at a pretty high cost per usable gigabyte.

One feature of the SF-2200 firmware however is the ability to disable RAISE. I've never advocated it simply because I like the idea of being able to recover from a failed NAND die in the array, but at the 60GB capacity OCZ felt it was better left turned off (otherwise the drive would have to be sold as a 56GB drive instead).

Entire NAND die failures are pretty rare but it's still possible that one could happen. The 60GB Agility 3, as a result, makes a potential reliability tradeoff for capacity. Personally I'd like to see OCZ offer the option to enable RAISE, although I'm not sure if any user accessible utilities exist that would allow you to do that easily.

The Test

CPU

Intel Core i7 965 running at 3.2GHz (Turbo & EIST Disabled)

Intel Core i7 2600K running at 3.4GHz (Turbo & EIST Disabled) - for AT SB 2011, AS SSD & ATTO

Motherboard:

Intel DX58SO (Intel X58)

Intel H67 Motherboard

Chipset:

Intel X58 + Marvell SATA 6Gbps PCIe

Intel H67
Chipset Drivers:

Intel 9.1.1.1015 + Intel IMSM 8.9

Intel 9.1.1.1015 + Intel RST 10.2

Memory: Qimonda DDR3-1333 4 x 1GB (7-7-7-20)
Video Card: eVGA GeForce GTX 285
Video Drivers: NVIDIA ForceWare 190.38 64-bit
Desktop Resolution: 1920 x 1200
OS: Windows 7 x64

 

Random & Sequential Performance
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  • Nicolas Pillot - Friday, May 27, 2011 - link

    Seeing Vertex 2 120G and Agility 3 120G at the same price, which one should i buy ?
    BTW : no sata 3 motherboard at the moment, so choice shouldn't be based on it.
    Reply
  • DanaG - Wednesday, June 01, 2011 - link

    I sure hope the Agility/Vertex 3 drives are more reliable than the Vertex 2 is. I had one fail two weeks ago, and then the replacement I got last Wednesday failed on Saturday. I believe it happened when we had a momentary interruption in power. The laptop and secondary-bay HDD are fine, and the drive kept working until I shut it down; once I did so, the drive became totally unresponsive.

    The drives also can't handle ATA Password properly:
    http://www.ocztechnologyforum.com/forum/showthread...

    From the forums and Newegg's reviews, it looks like plenty of other people have similar issues. For comparison, I've had zero issues with my old Indilinx drive. I like the performance of the Vertex 2, but I don't feel confident in the reliability of any Sandforce drives now.

    Anand, can you please talk to the OCZ people about these sorts of things?
    Reply
  • cactusjuggler - Wednesday, June 01, 2011 - link

    Firstly, I really appreciate AT's in depth reviews. That said, I absolutely agree with DanaG, and I don't see reviews addressing the reliability of these drives--particularly SandForce ones.

    I'm pricing out two new computers at the moment, and have been surveying the SSD landscape. If I made a buying decision purely on this review and others that focus on performance I'd already have ordered a Vertex 2 or the like, but after reading enough about failed drives, there's no way I'm buying anything with a SandForce controller for a good long time.

    Based on the sheer number of anecdotes I'm seeing I find it odd that reviews aren't even mentioning the issue of reliability. 6 out of 10 of the most recent comments on Newegg for the OCZ Agility 2 are complaining about outright failure (in some cases replaced drives also failed), or major problems using the drive.

    That sort of track record is embarrassing in a retail product, and really makes me wary about the reliability of the technology overall. Compounded with the apparent fact that data on a bricked drive is irretrievable in many (the majority?) of cases, and you really have to think twice about using one.

    Given all this it's kind of amazing, and downright laughable, that some of these drives are supposedly targeted at enterprise level customers.
    Reply
  • rajeanand - Wednesday, June 01, 2011 - link

    For all those looking for a Corsair Force 3 review, the first on is now online: http://www.kitguru.net/components/ssd-drives/zardo...

    Seems performance is very similar to the Agility3 reviewed in this article, although the Force 3 reviewed in the article is a 120GB
    Reply
  • curiousincal - Friday, December 02, 2011 - link

    Can tell me the preconditioning for the random read test and the preconditioning for the random write test used here?

    Thanks,
    Reply
  • johan008 - Thursday, January 26, 2012 - link

    Mine died after 4 months. OCZ used "unauthorized reseller or warranty not transferable" to stop all the claims. I was problem ticket no: 240 526 and it keep rising fast. See OCZ discussion forum before you buy as these SSD from OCZ are still very unstable. Reply
  • jdtwoseven - Wednesday, August 01, 2012 - link

    I've had three OCZ SSD products, including one of these Agility 3 240 gb SSDs, and I've ended up having to RMA each one of them. That is a terrible record of reliability for the drives. The amount of time that it took to get a replacement was also painfully slow. Not good. Buy a Crucial M4, which is what I did while I was waiting. The Crucial M4 is fast, and I've had no problems at all. Reply

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