We got the first glimpse of Transcend's SSD370 at Computex last year and now the drive has been in retail for quite some time. The interesting bit about the drive is its custom Transcend firmware, which is accompanied by a relabeled Silicon Motion SM2246EN controller (Transcend calls it TS6500). The SM2246EN has increasingly been gaining popularity among SSD vendors, but the SSD370 is the first time I've come across a custom firmware solution. Silicon Motion's business model is similar to SandForce's in the sense that it can deliver the whole package (controller hardware & firmware), but also allows custom firmwares (although I don't know if customers get full source code access, which at least SandForce doesn't allow).

Relabeling the controller is nothing unheard of because at least OCZ and Toshiba have done it in the past. Usually the reason why manufacturers do this is to ensure that their drive isn't mixed with the other drives that use the same controller because even with the same controller the drives can be totally different (excellent case in point is Marvell based SSDs). You would be surprised how often I still see people classifying drives based solely on the controller silicon, so I certainly understand the manufacturers' motivation as it's not exactly fair to judge a drive based on the controller alone. At the end of the day, it's the firmware that designates the drive's performance and reliability - the controller is just a SoC that does the number crunching. I can't say I'm a big fan of controller relabeling because it creates confusion and may be seen as a dubious marketing act, but as long as the manufacturer is open about the real source of the silicon, it's not something that deserves a big call out in my opinion. 

Transcend SSD370 Specifications
Capacity 128GB 256GB 512GB 1TB
Controller Transcend TS6500 (rebranded Silicon Motion SM2246EN)
NAND Micron 128Gbit 20nm MLC
Sequential Read 550MB/s 560MB/s 560MB/s 560MB/s
Sequential Write 170MB/s 320MB/s 460MB/s 460MB/s
4KB Random Read 70K IOPS 70K IOPS 75K IOPS 75K IOPS
4KB Random Write 40K IOPS 70K IOPS 75K IOPS 75K IOPS
Idle Power Consumption 305mW 320mW 325mW 335mW
Read/Write Power Consumption 1.21W / 1.92W 1.28W / 3.11W 1.43W / 3.22W 1.76W / 3.46W
Endurance 150TB 280TB 550TB 1180TB
Warranty Three years
Online Pricing $60 $105 $200 $394

The SSD370 is available in capacities from 32GB to all the way to up to 1TB. I decided to leave out the 32GB and 64GB units from the specification table as I suspect these are mostly OEM-focused models because (to be honest) there isn't a significant retail market for drives smaller than 128GB anymore. In addition to the SSD itself, the retail package includes a 3.5" desktop adapter and for drive migration Transcend provides a cloning function through its own SSD Scope Utility.

By default, the SSD370 doesn't support AES and TCG Opal encryption, but Transcend has a customized firmware that enables encryption. I suspect the custom firmware is aimed towards PC OEMs because the major market for self-encrypting drives (SEDs) is still in business PCs. eDrive, however, is not supported at the moment, although Transcend's plan is to add support in the near future.

The SSD370 doesn't support slumber power modes (HIPM+DIPM) because Transcend decided to disable the feature due to some prior compatibility issues with hosts that didn't properly support the feature. DevSleep, however, is supported according to the data sheet, but there are no power figures to support that, so I'm thinking it's a feature that can potentially be enabled through a custom firmware if a customer requires it.

In the NAND department Transcend uses Micron's 128Gbit 20nm MLC NAND, which is fairly common in more value-oriented drives. Micron has also started shipping its 16nm NAND to customers and I think Mushkin's Reactor was the first SSD to adopt it, but we will likely see many SSD OEMs transitioning to Micron's 16nm during H1'15 as the shipping volumes increase.

Interestingly the SSD370 employs partial power loss protection as there are ceramic capacitors on the PCB to provide power in case of a sudden power loss. Ceramic capacitors are fairly low capacity and can't provide the necessary power to flush everything from the DRAM cache to NAND, so user data in the DRAM is still in jeopardy, but the capacitors ensure that data at rest (i.e. in lower pages) and the NAND mapping table are safe. That's similar to what Micron did with the M600 and I suggest you read the review if you are looking for a more in-depth explanation regarding client-level power loss protection.

Another intriguing feature is what Transcend calls StaticDataRefresh Technology. As the 840 EVO performance degradation bug taught us, the charge in cells degrades over time, which results in errors when the cell is read. ECC can fix a certain number of error bits, but if the limit is exceeded corrupted data will be sent to the host. The StaticDataRefresh technology monitors the error rates and when a preset threshold value is reached, the data will be rewritten to restore the correct cell charge level. I suspect all SSDs do this because it's vital to ensure the health of old data, but it's the first time I've seen it mentioned in a data sheet.

Test Systems

For AnandTech Storage Benches, performance consistency, random and sequential performance, performance vs. transfer size, and load power consumption we use the following system:

CPU Intel Core i5-2500K running at 3.3GHz (Turbo & EIST enabled)
Motherboard ASRock Z68 Pro3
Chipset Intel Z68
Chipset Drivers Intel + Intel RST 10.2
Memory G.Skill RipjawsX DDR3-1600 4 x 8GB (9-9-9-24)
Video Card Palit GeForce GTX 770 JetStream 2GB GDDR5 (1150MHz core clock; 3505MHz GDDR5 effective)
Video Drivers NVIDIA GeForce 332.21 WHQL
Desktop Resolution 1920 x 1080
OS Windows 7 x64

Thanks to G.Skill for the RipjawsX 32GB DDR3 DRAM kit

For slumber power testing we used a different system:

CPU Intel Core i7-4770K running at 3.3GHz (Turbo & EIST enabled, C-states disabled)
Motherboard ASUS Z87 Deluxe (BIOS 1707)
Chipset Intel Z87
Chipset Drivers Intel + Intel RST 12.9
Memory Corsair Vengeance DDR3-1866 2x8GB (9-10-9-27 2T)
Graphics Intel HD Graphics 4600
Graphics Drivers
Desktop Resolution 1920 x 1080
OS Windows 7 x64
Performance Consistency & TRIM Validation
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  • hojnikb - Tuesday, January 27, 2015 - link

    geizhals.at also finds 32GB version for 32€. Although i dont think many people will buy this.
  • Maltz - Tuesday, January 27, 2015 - link

    "The StaticDataRefresh technology monitors the error rates and when a preset threshold value is reached, the data will be rewritten to restore the correct cell charge level. I suspect all SSDs do this because it's vital to ensure the health of old data, but it's the first time I've seen it mentioned in a data sheet."

    I've also believed this for some time. This is a little off-topic, but doesn't this mean that TRIM is more important to drive longevity than is widely believed? Sure, garbage collection and over provisioning can usually maintain a drives' performance levels, but if the drive is re-copying around unused blocks, then this seems like a problem. (I'm looking at you, Apple!)
  • Kristian Vättö - Tuesday, January 27, 2015 - link

    Technically yes, because the drive would be rewriting invalid (i.e. deleted) data as well. However, even without TRIM the drive will know what pages are invalid once the OS writes to the same LBAs again. The invalid pages will then be deleted sometime during garbage collection, which will return the drive to "TRIMed" state (i.e. no invalid data).

    It's basically the same with TRIM too because the drive doesn't necessarily erase the data immediately (i.e. data will initially be written to OP space). TRIM merely gives the drive a heads up and the data can be deleted when appropriate, whereas non-TRIM system will give the heads up when there' already new data coming in.
  • Gc - Tuesday, January 27, 2015 - link

    | p7: Drive Power Consumption - Random Write
    | ...
    | Transcend SSD370 128GB - 1.90
    | ...
    | Transcend SSD370 512GB - 2.73
    | ...
    | Transcend SSD370 256GB - 3.12

    Anyone have an explanation for how the middle 256GB size used the most power in this test?
    (or was there a typo?)
  • IlikeSSD - Wednesday, January 28, 2015 - link

    with new OCZ prices I'd rather go for Arc... http://www.kitguru.net/components/ssd-drives/leo-w...
  • velanapontinha - Wednesday, January 28, 2015 - link

    I've been waiting for this review for months. These drives were being showcased inside a low end server at Computex. I bought for 512GB drives and put them inside a HP server, connected in RAID 5 to a P410i controller.
    After a few months I started experiencing one drive failing every week. It all went downhill, as the failures started ocurring almost every day.
    I removed those drives and they are now working fine inside laptops.
    Transcend support told me they could not provide any support, as these drives were not tested in server environments.

    Although these are working fine and fast in laptops, I was a bit disappointed that they show it running in servers at Computex and then fail to support that same scenario in the real world.
  • velanapontinha - Wednesday, January 28, 2015 - link

    Please read "I bought *four 512GB drives".
    Also, I'd like to add that when placed in laptops, the drives reported 100% health as per Transcend's app.
  • editorsorgtfo - Thursday, January 29, 2015 - link

    "the SSD370 is also listed at even lower prices on Amazon Prime right now"

    What about regular Amazon? I don't have a Prime account.
  • cbjwthwm - Saturday, January 31, 2015 - link

    What firmware was used on the Plextor M6S during testing, or are those old historical results provided for comparison testing? Newer Plextor firmwares (released over the last 6 months) are supposed to have addressed their service time issues, and it would be interesting to see Crucial / Micron's M550 and M600 with their recent (early Jan 2015) firmwares that hopefully address the same issues.
  • Gizbeat - Monday, March 9, 2015 - link

    Thanks for the extensive review. I recently purchased the Kingmax 256GB SME35 which has the same controller and memory. So far the drive has been excellent.

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