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Upgrade the memory of your 2018 Mac mini up to 64GB
OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available


Great for travel or for desktop!

Mercury Accelsior PCIe SSD — Speed vs Capacity and Data Type (240GB)

OWC Mercury Accelsior PCIe SSD card

This page details the performance across the entire drive capacity (0..1000 files) using the DiskTester fill-volume test; see the notes and test details on the performance summary page.

The results shown below are for the 240GB OWC Mercury Accelsior, which has 2 X 120GB SSD modules installed on the PCIe card. Performance might be even higher with the 480GB model.

Results

See the graph below.

The performance is outstanding.

With a single Accelsior, reads are at 650 MB/sec for both compressible and incompressible data.

Write speed is similar to read speed for compressible data, but for incompressible data, the speed does drop (the absolute worst case of filling the entire drive with incompressible data, continually).

The graph captures an interesting initial-use hiccup in the write speed of incompressible data at about the 600 offset (orange line). Note that a “seasoned” drive offers consistent performance across the drive (gray line).

Since I have observed this behavior with the 120GB Mercury Extreme Pro 6G drives, I believe it to be a general characteristic of the Sandforce controller. The same behavior is also seen with the 480GB Accelsior.

The little glitch at the very end of the test occurs with all types of drives, SSDs or hard drives, and should be ignored.

Click for a larger graph.

OWC Mercury Accelsior PCIe SSD card — write/read performance for single card

RAID-0 stripe

With a striped pair (cards tested after the single-card tests and were thus “seasoned”), consistent speed is seen for both compressible and incompressible data across the entire drive.

OWC Mercury Accelsior PCIe SSD card — write/read performance RAID-0 stripe
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SanDisk 256GB Extreme PRO UHS-I SDXC Memory Card
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