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The Atom EX40’s performance is excellent. If you read my review of the 20Gbps Atom EX20, you know that I had issues with the included cable. The EX40 shipped with what looked like an identical cable, but had no issues. Go figure. Firmware? Handshaking? The Atom EX40, while not superb in CrystalDiskMark 8’s sequential tests, turned in very impressive 4K and real-world transfer times. Thanks to the latter, it ranked as the fastest pre-populated 40Gbps overall that I’ve tested. The EX40 was slower than only the TerraMaster D1 enclosure with a Corsair MP700 Pro installed, and the Ugreen CM850 encl

Once I switched cables, the 4TB Atom EX20 turned in a blistering performance. One that garnered it the number-two spot among all 20Gbps SSDs. The only drive to beat it was the Asus TUF Gaming A2, which is actually an unpopulated enclosure that I filled with an extremely fast Samsung 9100 Pro. That was not particularly fair of me, so consider the EX20 the top dog in pre-populated 20Gbps USB. That’s borne out by the drive’s CrystalDiskMark 8 numbers shown below. The Glyph Atom EX20 again competed nicely with its rivals (Corsair EX400U, Crucial X10) in the CrystalDiskMark 4K tests. The Atom EX20