At Computex ADATA had a variety of new SSDs on display. While most were based on upcoming technologies such as TLC NAND and the PCIe/NVMe interface, the company also displayed an XPG SX930, which is an update to ADATA's high-end XPG lineup. The series was in need of a refresh because the SX900 dates back to 2012, so with the SX930 ADATA is hoping to breath new life into its enthusiast SSDs.

ADATA markets the SX930 as a gaming SSD with a five-year warranty and in order to attract more gamers the company had to reconsider its branding and design. The hummingbird logo was considered not to be very "street-proof" among gamers who are often looking for something a little flashier, hence the old logo is now gone and replaced by a new flame design. Personally I think flames are quite a cliché in gamer marketing, but I guess a portion of the gaming crowd may appreciate a design that's more than just a metal chassis. Whether the look of an SSD inside a case matters is a whole new question, but I'll let everyone use their own justification on that. 

On the hardware side the SX930 uses JMicron's brand new JMF670H controller. JMicron has never really been known for high performance SSD controllers and while the JMF670H isn't aimed to take a jab at Samsung and Marvell based drives, JMicron believes it is competitive against Silicon Motion's SM2246EN and Phison's S10 controllers. 

At the silicon level the JMF670H is very similar to its predecessor. JMicron employs a single 32-bit ARM968 core, which is the smallest and lowest power member of ARM's ARM9 family and is mostly aimed for embedded applications such as SSD, USB and networking controllers. JMicron prefers not to disclose the frequency, but told us that the frequency is the same in both JMF667H and JMF670H.

Only the ECC circuitry sees an enhancement to support BCH ECC of 72 bits per 1KB (i.e. can correct up to 72 bits in 1KB of data), whereas the JMF667H was only capable of correcting up to 40 bits. Improving ECC is necessary for supporting the latest 15nm and 16nm NAND nodes because as NAND scales down the error rate increases as cells become more vulnerable to cell-to-cell interference and electron leakage. JMicron doesn't have any RAID5-like parity scheme in the JMF670H, so the BCH ECC engine is solely responsible for error correction.

While Silicon Motion and Phison both support TLC in their latest controllers, JMicron won't be supporting TLC until next year when the JMF680H ships. That's certainly a disadvantage compared to the competition, but I'm no longer that bullish on TLC after Samsung's issues and the marginal price cuts that OEMs are promising. I'm now looking forward to 3D TLC because it will enable planar MLC-like performance and endurance, along with hopefully larger price cuts because the market in general will shift more towards TLC, meaning higher production and scale benefits. At this time, we wait for JMicron's solution in this space.

ADATA XPG SX930 Specifications
Capacity 120GB 240GB 480GB
Controller JMicron JMF670H
NAND Micron 16nm 128Gbit MLC
Sequential Read 550MB/s 550MB/s 540MB/s
Sequential Write 460MB/s 460MB/s 420MB/s
4KB Random Read 70K IOPS 75K IOPS 75K IOPS
4KB Random Write 45K IOPS 70K IOPS 72K IOPS
Slumber Power 140mW 140mW 140mW
Read Power 1.38W 1.39W 1.48W
Write Power 1.90W 3.05W 4.38W
Encryption N/A
Warranty Five years
MSRP $80 $110 $200

The retail package includes all the typical ADATA accessories: 3.5" adapter, 9.5mm spacer and eight mounting screws (four for the drive and another four for the desktop adapter). All buyers can download a Disk Migration Utility from ADATA's website, which was co-developed with Acronis that supplies migration software to nearly all SSD vendors. 

The SX930's maximum capacity is 480GB because of the JMF670H's limitations. With the DRAM controller in the JMF670H only supporting 512MB of DDR3, the NAND capacity maxes out at 512GB because modern NAND mapping table designs typically require about 1MB of DRAM per every 1GB of NAND. The next generation JMF680H will overhaul the DRAM controller and support up to 2GB of DRAM, enabling capacities as high as 2TB. While 1TB-class SSDs are certainly still a small niche, it comes across a little confusing that ADATA's high-end SX930 does not have a 1TB model, but the more value-oriented Premier SP610 and Premier Pro SP920 (with 3-year warranties) carry 1TB SKUs. For an end-user this is mostly negligible, but I'm not convinced this is the best product positioning strategy.

ADATA refers to the NAND in the SX930 as "Enterprise MLC+". It's certainly not eMLC, but merely higher binned normal MLC to support the five-year warranty ADATA is offering (compared to the standard 3-year). As ADATA does NAND binning and packaging in-house, it has the ability to sort dies and save the highest quality ones for SX930 and enterprise SSDs, while the lower quality dies end up in other client SSDs, USB sticks and SD cards depending on the quality level. ADATA doesn't give separate endurance rating for the SX930, but I was told the NAND endurance is at least 3,000 P/E cycles, which should give a rough idea of the expected lifetime.

Capacity 120GB 240GB 480GB
SLC Cache Size 4GB 8GB 16GB
 

While the hardware side of the new JMF670H doesn't differ much from the old JMF667H controller, the firmware has been upgraded. The JMF670H firmware carries a feature called Write Booster, which is JMicron's SLC cache implementation. Even though the JMF670H doesn't support TLC NAND, JMicron believes that an SLC cache can still improve performance for MLC, especially when combined with 15nm or 16nm NAND with higher program/erase latencies. Write Booster caches all IOs regardless of their size, and JMicron does some write optimizations when moving data from the SLC cache to MLC cache to reduce write amplification for higher endurance.

Write Booster works with both normal NAND and pseudo-SLC NAND. As many of you may know, it's possible to program just one bit per cell to MLC NAND by only using the lower page (i.e. larger voltage distribution), but NAND vendors also have special pseudo-SLC dies. Unfortunately, all vendors are relatively quiet about what exactly happens inside a pseudo-SLC die, but JMicron told us that there is an improvement in read performance when using proper pseudo-SLC instead of simply writing to lower pages. In the case of SX930, ADATA is using real pseudo-SLC NAND from Micron, which does carry a price premium over normal NAND, but given the higher-end focus of the SX930 that makes sense.

AnandTech 2015 SSD Test System
CPU Intel Core i7-4770K running at 3.5GHz (Turbo & EIST enabled, C-states disabled)
Motherboard ASUS Z97 Deluxe (BIOS 2205)
Chipset Intel Z97
Chipset Drivers Intel 10.0.24+ Intel RST 13.2.4.1000
Memory Corsair Vengeance DDR3-1866 2x8GB (9-10-9-27 2T)
Graphics Intel HD Graphics 4600
Graphics Drivers 15.33.8.64.3345
Desktop Resolution 1920 x 1080
OS Windows 8.1 x64
Performance Consistency
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  • Oxford Guy - Friday, July 17, 2015 - link

    We'll just pretend that the 840 EVO had not been heavily hyped by commentators like you all over the net for quite a long time as well as by review sites. We will also just pretend that it did not have very heavy sales figures. Instead because Samsung put out with a new drive that you want to push we will just pretend that anyone who bought the previous generation drives were idiots. Reply
  • Oxford Guy - Friday, July 17, 2015 - link

    Plus, it was Samsung who decided to stick with the EVO name. Reply
  • sonny73n - Saturday, July 18, 2015 - link

    @Oxford Guy,

    I couldn't agree more with you. Thank you for explaining things clearer than I ever could have.
    Reply
  • sonny73n - Friday, July 17, 2015 - link

    @Stochastic

    840 EVO sequential read at ~100MB/s. My 5900RPM Seagate 2TB HDD is at ~135MB/s. Lol
    Reply
  • leexgx - Friday, July 17, 2015 - link

    what about random data speeds (as that's more the problem with HDDS) Reply
  • sonny73n - Saturday, July 18, 2015 - link

    What about a product that doesn't meet advertised specs? "Fool me once, shame on you..." I'll make sure the second line of that saying won't apply to me. Reply
  • leexgx - Saturday, July 18, 2015 - link

    if you're using a 840 EVO you can update the firmware to restore the drive to more so normal performance (unless your on linux or OSX then best not) even so without the firmware update compared to a HDD the 840 evo SSD is overall faster Reply
  • sonny73n - Saturday, July 18, 2015 - link

    By the way, I'm still rocking my i5-2500K system OCed @4.5GHz. I always had an SSD for boot drive (C:) and 2 HDD drives for storage since the beginning. Why should there be problems with the HDDs as they're just storage drives? Damn why did I feel the urge to explain to a 5th grader? Reply
  • bill.rookard - Thursday, July 16, 2015 - link

    I was never crazy about the TLC premise either. I prefer the 830's for boot drives since they're very reliable and have a more proven track record. I think the 850's with the 3D NAND should be pretty durable as well. In my servers I have the Crucial MX100's (a pair of 256Gs - one for data, one for sync, but -not- raided) and they're solid drives and have not had a single spot of trouble with those. Reply
  • fokka - Thursday, July 16, 2015 - link

    after the 840 evo fiasko i'm reluctant to put my trust in samsung, especially when there are perfectly capable, performant and affordable SSDs like the bx100 available. 3d nand is nice and all, but for me crucial just seems like the safer bet right now. Reply

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