Last week OCZ pulled the trigger and introduced the world’s first SF-2000 based SSD: the Vertex 3 Pro. Not only was it the world’s first drive to use SandForce’s 2nd generation SSD controller, the Vertex 3 Pro was also the first SATA drive we’ve tested to be able to break 500MB/s on both reads and writes. Granted that’s with highly compressible data but the figures are impressive nonetheless. What wasn’t impressive however was the price. The Vertex 3 Pro is an enterprise class drive, complete with features that aren’t exactly in high demand on a desktop. As a result the V3P commands a premium - the drive starts at $525 for a 100GB capacity.

Just as we saw last round however, if there’s a Vertex 3 Pro, there’s bound to be a more reasonably priced non-Pro version without some of the enterprisey features. Indeed there is. Contained within this nondescript housing is the first beta of OCZ’s Vertex 3 based on a SandForce SF-2200 series controller. The price point? Less than half of that of the V3P:

Pricing Comparison
  128GB 256GB 512GB
OCZ Vertex 3 Pro $525 (100GB) $775 (200GB) $1350 (400GB)
OCZ Vertex 3 $249.99 $499.99 N/A

At an estimated $250 for a 120GB drive the Vertex 3 is more expensive than today’s Vertex 2, but not by too much nor do I expect that price premium to last for long. The Vertex 2 is on its way out and will ultimately be replaced by the V3. And SSD prices will continue to fall.

What sets a Vertex 3 apart from a Vertex 3 Pro? Not all that much, but SandForce has grown a lot in the past year and instead of just a couple of SKUs this time around there are no less than seven members of the SF-2000 family.

You should first know that SandForce only produces a single die, the differences between all of the members of the SF-2000 family are strictly packaging, firmware and testing.

The main categories here are SF-2100, SF-2200, SF-2500 and SF-2600. The 2500/2600 parts are focused on the enterprise. They’re put through more aggressive testing, their firmware supports enterprise specific features and they support the use of a supercap to minimize dataloss in the event of a power failure. The difference between the SF-2582 and the SF-2682 boils down to one feature: support for non-512B sectors. Whether or not you need support for this really depends on the type of system it’s going into. Some SANs demand non-512B sectors in which case the SF-2682 is the right choice.

You may remember that our Vertex 3 Pro sample used a SF-2682 controller. That’s because initially all SandForce made were SF-2682s. Final versions of the V3P will likely use the cheaper SF-2582.

The SF-2200/2100 series are more interesting because of their lower target price points. You lose support for the supercap but that’s not as big of a deal on the desktop since you’re not working with mission critical data. The big difference between the 2200 and 2100 is support for 6Gbps SATA, the former supports it while the latter doesn’t. This is a pretty big difference because as we’ve seen, when paired with a 3Gbps controller the SF-2000 isn’t too much better than what we had with the SF-1000.

The other big difference is the number of byte lanes supported by the controller. The SF-2181 and above all support 8 NAND flash channels, however only the SF-2282 supports 16 byte lanes. Each NAND device is 8 bytes wide, supporting 16 byte lanes means that each channel can be populated by two NAND devices. This lets a single SF-2282 controller talk to twice as many NAND devices as a SF-2281.

There’s no performance difference between the 8 and 16-byte lane versions of the chip, it’s just a matter of pure capacity. Thankfully with 25nm NAND you can get 8GB of MLC NAND on a single die so both the 2281 and 2282 should be able to hit 512GB capacities (the 2281 simply needs higher density NAND packages).

The Vertex 3 sample we have here today uses the SF-2281. Our sample came configured with sixteen 16GB Micron 25nm ONFI 2.0 NAND devices. Remember that while both Intel and Micron own the 25nm fabs, the two companies are providing different specs/yields on 25nm NAND. The 25nm Micron stuff is rated at around 3,000 p/e cycles from what I’ve heard, while the Intel 25nm is rated at 5,000. The main difference here is that the Micron is available in great quantities today while the Intel 25nm isn’t.

RAISE: Optional

One other difference between the SF-2500/2600 and the SF-2100/2200 is the optional nature of RAISE. You'll remember that in order to allow for lower quality NAND SandForce stripes a small amount of redundant data across the array of NAND in a SF-1000/2000 drive. SandForce never stores your actual data, rather a smaller hash/representation of your data. When your data is compressed/deduped for storage, SandForce's controller also generates parity data equal to the size of a single NAND die in the array. This process is known as RAISE (Redundant Array of Independent Silicon Elements) and it allows you to lose as much as a full NAND die worth of data and still never see a bit of data loss from the user's standpoint. At 25nm however a single die can be as large as 8GB, which on a lower capacity drive can be a significant percentage of the total drive capacity.

With the SF-2100/2200, SandForce allows the manufacturer to disable RAISE entirely. At that point you're left with the new 55-bit BCH ECC engine to do any error correcting. According to SandForce the new BCH ECC engine is sufficient for dealing with errors you'd see on 25nm NAND and RAISE isn't necessary for desktop workloads. Drive makers are currently contemplating what to do with RAISE but as of now the Vertex 3 is set to ship with it enabled. The drive we have here today has 256GB of NAND, it'll be advertised as a 240GB drive and appear as a 223.5GB drive in Windows.

Here We Go Again: 4KB Random Write IOP Caps

With the SF-1200 SandForce capped the peak 4KB random write speed of certain drives while negotiating exclusive special firmware deals with other companies to enable higher performance. It was all very confusing as SandForce shipped initial firmware revisions with higher performance and later attempted to take that performance away through later firmware updates.

If you pay attention to the table above you’ll notice that there are two specs for 4KB random write IOPS: burst and sustained. The burst value is for around 15 seconds of operation, the sustained is what happens when the firmware initiated performance cap kicks into action. By default the SF-2100/2200 drives have a cap of 20,000 IOPS for 4KB random writes. After a period of about 15 seconds, the max performance on these drives will drop to 20K. The SF-2500/2600 controllers are uncapped, max performance can remain at up to 60K IOPS.

The beta Vertex 3 review sample I have here today manages around 45K IOPS in our 4KB random write test. That test runs for 3 minutes straight so obviously the cap should’ve kicked in. However it didn’t.

I asked SandForce why this was. SandForce told me that the initial pre-release firmwares on the SF-2200 drives don’t have the cap enabled, but the final release will put the cap in place. I also asked SandForce if it was possible for one of its partners to ship with a special firmware build that didn’t have the cap in place. SandForce replied that anything was possible.

I asked OCZ if this meant the drive I was testing wasn’t representative of final, shipping performance. OCZ stated very clearly that performance will not change between the drive I have today and the drive that goes on sale in the next 2 months. To me this sounds like SF and OCZ have struck another exclusive firmware deal to ensure slightly higher performance on the Vertex 3 compared to a standard SF-2200 based drive.

SandForce wouldn’t comment on any existing agreements and OCZ said it couldn’t get SandForce to confirm that the V3’s performance wouldn’t change between now and its eventual release. Based on what we saw last time I expect SandForce to offer the 60K IOPS firmware to all partners that meet certain order size commitments. Order enough controllers and you get a special firmware, otherwise you’re stuck with the stock SF-2200 firmware.

Of course this makes things very confusing for those of you looking to shop around when buying a SF-2200 drive. I do wish SandForce would just stick to a single spec and not play these sorts of games but that’s just how business works unfortunately.

The good news is that for most desktop workloads you don’t really benefit from being able to execute more than 20K IOPS, at least in today’s usage models.

Faster than a Vertex 3 Pro & The Test
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  • Cow86 - Thursday, February 24, 2011 - link

    This is likely going into my next build ^^ Which is a few months off still, so hopefully the prices will be somewhat favourable by then.... Reply
  • vol7ron - Friday, February 25, 2011 - link

    let me guess... waiting for z68? :) Reply
  • Rasterman - Thursday, February 24, 2011 - link

    Which of the benchmarks relate to loading windows and loading programs and games or levels in games? It would be nice to see how these compare, my guess is its not worth it to upgrade from a Crucial Real SSD C300 256GB to a Vertex 3 256GB as the perceived difference is going to be negligible?

    Some real world tests would be nice:
    fresh load of windows 7
    start windows 7 from hibernation
    starting major games
    loading levels in major games
    starting major programs (photoshop, visual studio, windows media player, itunes, outlook)
    Reply
  • ImSpartacus - Thursday, February 24, 2011 - link

    Well, if you do upgrade from that C300, I would happily take it off your hands.

    I figure that old hardware is only worth, ohhhh, $100? Yeah, that's about right.

    So, what do you say?
    Reply
  • Figaro56 - Friday, February 25, 2011 - link

    The Crucial C300 256GB drive for $100? Dream on!

    You can buy one brand new today for $420 shipped at amazon.com. You under estimate the C300, it's still a valid product and $100 is just a ridiculous comment.
    Reply
  • vol7ron - Friday, February 25, 2011 - link

    brand new != used

    with a used drive, you've already cut into warranty and you've reduced its lifespan (as negligible a point as it may be).
    Reply
  • Figaro56 - Friday, February 25, 2011 - link

    Then you had better buy a new one then. No one is going to sell their originally priced $600 Crucial RealSSD C300 256GB SSD for $100, especially after this review.

    There is a margin of real world performance improvement with the Vertex 3 true, but certainly not so superior over the C300 as to make someone crazy enough to sell an 8 month old $600 SSD for $100 as it's "obviously" not obsolete it's just 2nd best. That's just retarded.

    These SSD drives have an incredible life span so cutting into the life span over 8 months of use is nebulous. The warranty is only there for warm fuzzies, if it works it works.
    Reply
  • jimhsu - Friday, February 25, 2011 - link

    I suppose IM's response is a joke considering the OP's question of whether an ultra-fast drive is faster than the super-fast drive that he already has.

    (For the record, I bought the C300 256GB for $400 in newegg's awesome 20% off sale).
    Reply
  • vol7ron - Friday, February 25, 2011 - link

    I took it as a joke too, but still you're not going to get top dollar if you're selling a used device. A person would rather go get a refurb.

    Also, didn't the C300 have many problems that crept up? Not saying it hasn't been solved and the problems weren't rare, but I though a few weeks after Anand got their version, it died - and a few others died as well (betas and productions). For whatever reason, I decided to stay away from Crucial for that reason; not permanently, but in the short run.

    I'm more curious to see with what Intel has to offer. Even if they don't introduce a compression algorithm, I like their wear-leveling better - it should require less additional spare NAND and be cheaper in general. And, of course, I like to see how Vertex 3 fares with TRIM as it approaches the capacity limit.
    Reply
  • Figaro56 - Tuesday, March 01, 2011 - link

    The infamous firmware issue of the Crucial drive was solved, I've never had a problem. This C300 is a very fast SSD and I'm more than happy with it. When an SSD comes along that is actually twice as fast in every bench mark as my C300 256GB SSD then I might feel as though it's obsolete, but we're not there yet. Reply

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