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Saw this on reddit's Mac mini forum.

From what I’ve seen.
128GB -> ~600MB/s
256GB -> ~1.3GB/s
512GB -> ~1.9GB/s
1TB -> ~2.6GB/s

Reads are all > 2GB/s.

source link: https://twitter.com/tapbot_paul/status/1060611584639361024
Wonder what write speed the 2TB does?
I'm ordering a maxed-out 2TB one soon (self-upgrading to 32GB RAM), so will add speeds for it then.

EDIT: Now buying after 25 March Apple event! ;-)

(link-back: 1 month ago (edited))
 
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EDIT (2019.04.06.Sat):

2TB SSD speeds, on a newly setup fresh out of the box machine bought a week ago (just after Apple kindly knocked off £180 from the 2TB tier; lucky timing!) ...

2TB => 2600 MB/s (aka 2.6GB/s) write / 2600 MB/s (aka 2.6GB/s) read.

So now you know the writes are similar to the 1TB, but the reads match the write speeds, so are potentially higher than the other SSD sizes (though as no one has confirmed the specific read speeds for the other sizes AFAICT, that's not completely confirmed).

Hence depending on your usage, it might be worth getting the 2TB (or at least the 1TB) over the smaller SSD sizes.

Hope this helps buying decisions, folks! ;)
 
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I have the i7/16GB/256GB 2018 Mini and have been considering how best to handle my media needs.
Silence, speed, and price were the priorities in decreasing order so I went for an external TB3 NVMe.

I threw a Sabrent 2TB Rocket NVMe PCIe M.2 2280 in a Thunderbolt3 to NVME M.2 2280 case and am getting ~2k write / ~2.1k reads with encrypted APFS. Total price was under $400.

Can't wait to move the Lightroom library over!
 
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