Discussion Corsair EX400U USB4 external SSD disk speed test results

[Joe_Easy]

For anyone interested, I took delivery of the new Corsair EX400U external SSD today, which claims data speeds of up to 4,000MB/sec sequential read and up to 3,600MB/sec sequential write. I don't need oodles of space, so opted for the 1TB model. Using it on a MBP M4 Pro 14, I formatted it APFS and tested it on Blackmagic Disk Speed Test. Results were good, but not what I had hoped for:

 

[Joe_Easy]

Slightly better read results using AJA System Test Lite...

 

[ByronHinson]

That’s what I’ve got so far

 

[USAFRet]

That’s what I’ve got so far

And that seems to be right in line with the advertised numbers.

 

[ByronHinson]

That’s what I’ve got so far

And that seems to be right in line with the advertised numbers.

Yep. Been working great so far. Really impressed

 

[Joe_Easy]

That’s what I’ve got so far

Oh, nice. What machine is that on? And what software is that?

 

[ByronHinson]

Oh, nice. What machine is that on? And what software is that?

MacBook Pro 16" M4 Pro
Software is AmorphousDiskMark on the app store

 

[Joe_Easy]

MacBook Pro 16" M4 Pro
Software is AmorphousDiskMark on the app store

Interesting. Matching your settings, I'm getting similar results on that software, except for write speeds on test 3, where I'm getting about half what you are. Any thoughts on why that might be?