Toshiba's RC100 has arrived as the company's first low-end retail NVMe SSD, and only their second retail NVMe SSD after the aging OCZ RD400. There's nothing else quite like the RC100 in the retail SSD market, but it is part of a broader trend of PCIe and NVMe interfaces being used for cheaper SSDs, and not just the high-end drives that all the first-generation NVMe products aspired to be. Prices on these entry-level NVMe SSDs are now encroaching on the SATA SSDs that still make up the bulk of the market.

BGA SSDs

The RC100 is descended from Toshiba's line of Ball Grid Array (BGA) SSDs for the OEM market. These drives stack the SSD controller and NAND flash memory dies in a single BGA package, making them suitable for small form factor systems that might otherwise use eMMC. Toshiba has also been mounting their BG series SSDs on M.2 2230 cards for OEMs that require upgradable storage devices. The Toshiba RC100 is based on the BG3 SSD, and the primary change in making a retail version is that the M.2 card has been lengthened to 42mm because relatively few existing systems support 30mm M.2 SSDs. This is still quite a bit shorter than the usual 80mm card length used by most consumer M.2 SSDs.

Toshiba's first NVMe BGA SSD was the BG1 introduced in 2015. It used 15nm planar MLC NAND and a 16x20mm package with a PCIe 2 x2 interface. The next generation BG2 was the first client drive to ship with Toshiba's 3D NAND flash memory, but it used their 48-layer design that was never competitive enough for a retail SSD. The BG3 was announced last year as part of Toshiba's transition to their 64-layer 3D NAND that is finally good enough to fully displace their planar NAND.

The small physical size of BGA SSDs limits both the width of their host interface (to two PCIe lanes instead of the four used by high-end NVMe SSDs) and the amount of memory they have. Toshiba's BG1 only offered 128GB and 256GB capacities, and the BG2 and BG3 only go up to 512GB. Toshiba's BG series and the RC100 also don't have a DRAM die in the stack, so these are DRAMless SSDs, and as we'll see can definitely behave like one. Meanwhile thermal throttling is usually not a concern for BGA SSDs because they don't offer the same performance as high-end NVMe SSDs, and consequently only use 2-3W under load instead of the 5-8W used by larger high-end M.2 SSDs.

To mitigate the performance limitations that result from not having a DRAM cache, Toshiba's BG2 introduced support for the NVMe Host Memory Buffer (HMB) feature, and that has been carried over to the BG3 and RC100. HMB is an optional feature that was added in version 1.2 of the NVMe specification, released in 2014. Though the feature was standardized years ago, adoption has been slow because there hasn't been much of a market for low-end NVMe SSDs in either the retail or OEM channels, and Microsoft's NVMe driver didn't implement HMB support until the Windows 10 Anniversary Update in 2016.

Toshiba RC100 Series Specifications Comparison
  120 GB 240 GB 480 GB
Form Factor single-sided M.2 2242 B+M key
Controller Toshiba unnamed
Interface NVMe 1.2.1 PCIe 3.1 x2
DRAM None (HMB supported)
NAND Toshiba 64L BiCS3 3D TLC
Sequential Read 1350 MB/s 1600 MB/s 1600 MB/s
Sequential Write 700 MB/s 1050 MB/s 1100 MB/s
4KB Random Read (QD32) 80k IOPS 130k IOPS 150k IOPS
4KB Random Write (QD32) 95k IOPS 110k IOPS 110k IOPS
Active Power 3.2 W
Idle Power (PCIe L1.2) 5 mW
Endurance 60 TBW
0.45 DWPD
120 TBW
0.45 DWPD
240 TBW
0.45 DWPD
Warranty 3 years
MSRP $59.99 (50¢/GB) $79.99 (33¢/GB) $154.99 (32¢/GB)

The Toshiba RC100 is available in capacities from 120GB to 480GB, essentially the same as the BG3 but with more spare area reserved to allow for slightly higher performance than the BG3. Sequential transfer speeds are rated to be several times faster than a SATA drive, while random access performance is only a bit higher than SATA drives—the flash itself is more of a bottleneck for random IO than the host interface, especially on a DRAMless SSD. The RC100 comes with a three year warranty and its write endurance rating is about 0.45 drive writes per day (DWPD) for that time span, so it's a bit behind the mainstream and high-end consumer drives that are usually rated for 0.3 DWPD over a five year span.

The active power rating of 3.2W is much lower than most of the NVMe SSDs we've tested, and is more in line with SATA SSDs. Idle power is rated at 5 mW, but this is only on platforms with properly working PCIe power management, which doesn't include most desktops. The lack of DRAM and the narrower PCIe link both help keep power consumption low, but the performance impact of those limitations may prevent the overall efficiency from breaking out of the general pattern of NVMe SSDs being less efficient than SATA SSDs.

Toshiba's current retail SSDs: RD400, RC100, TR200

The RC100 uses the single-sided 22x42mm M.2 card form factor with notches in both the B and M positions because it only uses two PCIe lanes instead of four. This means it's mechanically compatible with M.2 slots that may only provide SATA signals. On the card itself, we find a little bit of power regulation circuitry to provide 1.2V and 1.8V from the 3.3V supply, the BGA SSD itself in a 16x20mm package, and enough empty space for the card to reach the first mounting hole on most motherboards.

The Toshiba RC100 essentially has no direct competition in the retail SSD market: M.2 2242 PCIe SSDs have been almost impossible to find until now, and even M.2 SATA SSDs in this form factor are rare. But systems that require these  shorter M.2 cards instead of the more common 80mm length are also rare. The closest competitors to the RC100 are other recent low-end NVMe SSDs based on either the Phison E8 controller or Silicon Motion SM2263, or their respective DRAMless variants (E8T and SM2263XT) that also use the NVMe HMB feature. We've reviewed the MyDigitalSSD SBX with the Phison E8 controller and have several more reviews on the way for this product segment.

With this review, we are finally switching entirely to test results gathered on a system with Meltdown and Spectre patches, current as of May 2018. We have not yet re-tested every drive in our sample collection, so the comparison results in this review don't always show every relevant drive.

AnandTech 2018 Consumer SSD Testbed
CPU Intel Xeon E3 1240 v5
Motherboard ASRock Fatal1ty E3V5 Performance Gaming/OC
Chipset Intel C232
Memory 4x 8GB G.SKILL Ripjaws DDR4-2400 CL15
Graphics AMD Radeon HD 5450, 1920x1200@60Hz
Software Windows 10 x64, version 1709
Linux kernel version 4.14, fio version 3.6
Spectre/Meltdown microcode and OS patches current as of May 2018
Exploring The Host Memory Buffer Feature
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  • MadAd - Saturday, June 23, 2018 - link

    +1

    Anyone can review a flagship release, this is real tech reporting.
    Reply
  • Calin - Thursday, June 14, 2018 - link

    Yes, more people care about the low-mid end of the market than about the very high end - the M.2 2242 has multiple advantages (compact, doesn't need a 2.5 or 3.5 inch case location, doesn't need power cable, low power. Plenty of people will pay more for that, if the performance is equivalent (just as plenty of people pay more for pretty lights when the performance is equivalent, or pay more for a quiter component, or ...).
    So, while I'm not interested in M2 drives, thank you for the article :)
    Reply
  • gnufied - Thursday, June 14, 2018 - link

    Actually I have been looking for a decent 2242 SSD since forever. My thinkpad T450s has a 2242 slot and we have very little options.

    Having said all this, I dunno if this is comptaible with thinkpad's 2242 slot.
    Reply
  • timecop1818 - Thursday, June 14, 2018 - link

    most likely not, as that slot is probably for USB-based LTE modem or similar device. M.2 spec does provide for USB connectivity on A, B and E keyed cards/sockets. Reply
  • gnufied - Thursday, June 14, 2018 - link

    The 2242 slot defenitely can be used for M.2 SSDs. I am currently using https://www.amazon.com/gp/product/B012ASBZEO/ref=o... SSD with my thinkpad and it works.

    Reading through R100 review does not fill me with joy though. This NVMe disk does not even look better than M500.. :(
    Reply
  • Targon - Thursday, June 14, 2018 - link

    M.2 has different flavors, and depending on the slot and device you plug into it, may use a SATA connection rather than NVMe with the dedicated PCI Express lanes. The 2242 is a measure of width and length, NOT the interface. An obvious way to tell is that if you have two notches on the connector, you are not looking at a NVMe connection, while the single notch will support the PCI Express lanes. At least, that is typically what is going on. With only two PCI Express lanes, without investigating, I suppose the two notches might still give you some NVMe, but I wouldn't be sure about that. Reply
  • Kwarkon - Friday, June 15, 2018 - link

    There are NVME drives with two notches (M+B), but this keying is limited to only 2 PCIe lines. Reply
  • Jorgp2 - Thursday, June 14, 2018 - link

    I already ordered one, I'll try to send you a PM if it works Reply
  • gnufied - Thursday, June 14, 2018 - link

    Nice. thank you. also do a crystal mark or something while you are at it. :-) Reply
  • close - Thursday, June 14, 2018 - link

    Because it's less than half the price so it has a better chance of ending up in a "regular machine" than the 970 Pro. Reviews for halo products are great but what do you think most people will have a $350 SSD or a $150 one? Reply

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