Western Digital Introduces WD Black SN750 SE SSD: Entry-Level PCIe Gen4

Among several announcements today, Western Digital is introducing a new more affordable PCIe Gen4 SSD under their gaming-oriented WD Black brand (styled WD_BLACK). The new WD Black SN750 SE is not just a refresh of their existing SN750 but instead appears to be an entirely new and different drive. The SN750 SE brings PCIe Gen4 support but in other respects seems to be a downgrade compared to the SN750, and appears to have more in common with the WD Blue SN550. Based on the pictures and the few performance specifications that have been disclosed so far, the SN750 SE looks like a 4-channel DRAMless NVMe SSD, with respectable sequential read throughput but reduced sequential write throughput compared to the original SN750. Random IO performance was not included on the data sheet—not a good sign.

WD Black SN750 SE SSD Specifications

250 GB
500 GB
1 TB

Form Factor
M.2 2280 PCIe 4.0 x4

WD in-house


NAND Flash

Sequential Read
3200 MB/s
3600 MB/s
3600 MB/s

Sequential Write
1000 MB/s
2000 MB/s
2830 MB/s

Random Read

Random Write

5 years

Write Endurance
200 TB
0.4 DWPD
300 TB
0.3 DWPD
600 TB
0.3 DWPD


The WD Black SN750 SE is intended to be the more affordable Gen4 alternative to their flagship SN850. The smaller controller, apparent lack of DRAM, and newer NAND flash all combine to make the SN750 SE a significantly lower-power drive than its nominal predecessor, though the more interesting comparison would be against the WD Blue SN550. Write endurance ratings for the SN750 SE match the original SN750, but the 2TB model has gone missing. Pricing starts at $54.99 for the 250GB model, the midpoint between the WD Blue line and the existing WD Black products. The WD Black SN750 SE is now available for pre-order direct from Western Digital, and will be available through retailers and system integrators this summer.

This isn’t the first time that Western Digital has made a mess of the naming of their WD Black SSDs. The first generation in 2017 was simply the WD Black PCIe SSD. The next year, they released another WD Black SSD that was a huge upgrade: switching from a Marvell controller to their new in-house controller, and from 15nm planar TLC to 64L 3D TLC NAND flash memory—but the branding was confusingly similar, and the best way to tell which generation you were buying was to check if the advertised capacity was 256GB/512GB (old) or 250GB/500GB/1TB (new).  In 2018 Western Digital made the most minor of refreshes by releasing the WD Black SN750; the most significant change over its predecessor was the addition of an unambiguous (until now) model number. The hardware was identical and the firmware got only a minor update, and a version with a heatsink was added. That SN750 has been overdue for an update to use 96L instead of 64L TLC, a change which Western Digital made for their OEM drives by replacing the SN720 with the SN730. But the SN750 SE isn’t the simple NAND refresh we expected based on its name, nor is it a true successor and upgrade to the SN750.

The SN750 SE should make for a great mainstream NVMe drive. Western Digital has an excellent track record for getting good performance from DRAMless NVMe SSDs, and this will probably be enough to leapfrog the recent Samsung 980. But using a name that’s so similar to such a different product is a serious disappointment.