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Silicon Motion Has Four New 3D NVME SSD Controllers

Chris Ramseyer in Blogs on August 17, 2017

About Chris Ramseyer

Silicon Motion, Inc. displayed four new NVMe SSD controllers at Flash Memory Summit 2017. The company plans to have partner products with the new controllers on retails shelves in Q1 2018. 

On the surface this is just another announcement of intent, but there is so much more to the story. Let's just get this out of the way first: The SMI SM2262EN will be in the fastest consumer SSD available when it's released next year. We spent time with a reference design paired with IMFT's new 256Gbit TLC flash, and it's the fastest product we've ever tested. The SM2262EN controller delivers enterprise-level sequential throughput performance.

There are two package designs. The lower-cost and smaller SM2263 has four channels and the ability to use a DRAM buffer on the PCB. In the SM2263XT form, a DRAMless design takes advantage of system memory to cache the table map using host memory buffer (HMB). 

The larger SM2262EN controller also comes in two options.  The SM2262 will feed the upper mainstream market with a high-performance option. Were it available today, the SM2260 would be a competitor to Samsung's 960 series.  That won't be good enough to compete for the performance crown in 2018, though. To combat Samsung's upcoming 970 and 980 series, SMI plans to work with partners to release the SM2262EN. The EN uses the same physical silicon but has different programming and firmware. The changes utilize new SMI IP that better optimizes the cache algorithms.

Just how fast is the SM2260EN, you ask? SMI's press release shows up to 3,500 MB/s sequential read and 3,000 MB/s sequential write. That's enough to match the fastest PCIe 3.0 x4 enterprise SSDs shipping today. It also delivers nearly 1,000 more MB/s of sequential write throughput than the Samsung 960 Pro.

Host InterfacePCIe 3.0 x4PCIe 3.0 x4PCIe 3.0 x4PCIe 3.0 x4
PCIe ProtocolNVMe 1.3NVMe 1.3NVMe 1.3NVMe 1.3
NAND Flash Channels4488
Host Memory BuferNoYesNoNo
Sequential Read2,400 MB/s2,400 MB/s3,200 MB/s3,500 MB/s
Sequential Write1,700 MB/s1,700 MB's1,900 MB/s3,000 MB/s
Random Read300,000 IOPS280,000 IOPS (HMB)
140,000 IOPS (No-HMB)
370,000 IOPS370,000 IOPS
Random Write250,000 IOPS250,000 IOPS300,000 IOPS300,000 IOPS

We know that the SM2262EN will be a driving force for SSD manufacturers. The SM2262 (non-EN) shouldn't be glossed over. This controller already produces 960 Pro-like performance as a working prototype.

SMI didn't disclose the number of processor cores in each model, but we suspect the physically smaller SM2263 series features less processing power. This series most likely uses a dual-core processor, whereas the SM2262 uses a quad-core processor.

The SM2263 series splits into two distinct parts. The entry-level part is the SM2263XT DRAMless controller with up to 2,400 MB/s sequential read performance. The controller takes advantage of Host Memory Buffer (HBM) technology that's already built into your up-to-date Windows 10 installation. HMB uses up to 38MB of your system's memory (DRAM) to cache the data map table. There is a latency penalty with this technology, but it's much less than you would expect. SMI chose to show only the random read numbers with and without HMB.

The SM2263 will cover the mainstream SSD market with up to 2,400 MB/s sequential read performance. The controller, when paired with the right 3D NAND flash, will deliver 20,000 more random read performance than the SM2262XT using HMB technology and 160,000 more without HMB.
At Flash Memory Summit 2017, we learned that Intel removed the 610p from the SSD roadmap and will replace it with a new 700-Series part that will in turn replace the aging SSD 750. It looks like Intel and SMI's other partners will have several options to choose from, and the new entry-level standard will increase nearly 2x in real-world performance. 2018 looks to be a strong year for consumer SSD performance.


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