PCIe 4.0 SSD master control product and the improve performance

Sajjad Hussain
Oct 26 · 3 min read

You may have noticed that the PCIe 4.0 SSD currently on the market actually has only one main controller-Phison PS5016-E16. This master can only provide the highest sustained read and write speeds of 5.0GB/s and 4.4GB/s. Considering the PCIe 4.0 x4 bandwidth can reach 8GB/s, it is obviously not fully utilized. At the same time, the technology of the E16 main control is still 28nm, and the power consumption and heat generation are very considerable, resulting in each SSD having to be equipped with exaggerated heat sinks. So everyone is looking forward to the emergence of better PCIe 4.0 SSD master control. The good news is that PCIe 4.0 SSD master control products have exploded recently, and many products have been released.

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Phison exposed the latest test results of the second-generation PCIe 4.0 SSD master control solution PS5018-E18. The continuous reading speed has reached 7.38GB/s and the continuous writing has reached 7.02GB/s, which has greatly improved the performance. Although the manufacturing process has not been disclosed, it is definitely not predicted to be 28nm. I believe the problems of high power consumption and heat generation can be alleviated. GALAXY has previously announced that it will launch a new generation of PCIe 4.0 SSD HOF EXTREME, with the first launch using Phison E18 master.

It is also announced three PCIe 4.0 SSD master control solutions in one go, including the high-performance SM2264, the mainstream SM2267, and the entry-level SM2267XT. All products support PCIe 4.0 x4 system bandwidth, NVMe 1.4 standard protocol, are manufactured in 12nm process (Phison E16 is still 28nm, so the power consumption is out of control), quad-core ARM R8 CPU architecture, support seventh-generation NANDXtend ECC error correction technology, performance Optimized 4KB LDPC engine, RAID, can be matched with 3D TLC, QLC flash memory.

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Among them, SM2264 supports eight channels and 8CE, and the maximum rate per channel is 1600MT/s. SM2267 supports four channels and 8CE, and the continuous reading and writing speed can reach 7.4GB/s and 6.8GB/s. SM2267XT is further reduced to four channels, 4CE, and does not support DRAM cache, continuous read and write up to 3.9GB/s, 3.5GB/s, random read and write up to 500,000 IOPS. SM2267XT continuous performance and random write are the same as above. If random read is supported, HMB can also achieve 500,000 IOPS, if not, only 200,000 IOPS.

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We noticed that even the entry-level SM2267XT has better continuous read and write performance than PCIe 3.0 products. We believe that the prices of related products will be more affordable. It can be expected that PCIe 4.0 SSDs in the future will quickly become more commonplace in price.

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