An improvement on WD’s own SN500 in every way, the SN550 is also only 10 cents per gigabyte in the 1TB capacity.

WD’s new Blue SN550 is a nice improvement on the older SN500, though it still isn’t going to worry the competition with its performance. However, other vendors sure won’t be happy that it’s 10 cents per gigabyte at the 1TB capacity.
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https://www.pcworld.com/article/3505876/wd-blue-sn550-nvme-ssd-review.html