The older of the two Apple SSDs provides sub-SATA performance, while the more recent but smaller drive is a bit faster than SATA drives are capable of.
#Ssd owc aura pro pro
The OWC Aura Pro X2 seems to be the slowest of the four, though not by a big enough margin to worry about.
The modern NVMe drives all perform similarly on the burst sequential write test. Each burst writes 128MB as 128kB operations issued at QD1, for a total of 1GB of data written to a 16GB test file. Our test of sequential write burst performance is structured identically to the sequential read burst performance test save for the direction of the data transfer. Several of the drives (including the OWC) show a bit of a decline in performance at the highest queue depths where the OS has many active threads processing IO requests.
#Ssd owc aura pro full
Most of these SSDs offer full sequential read performance at QD2, but the more recent Apple SSD needs higher queue depths, especially on the 13" laptop.
Differences between the two laptops are for the most part much smaller than they were for the burst sequential read test. The older Apple SSD is still markedly slow, but the gap is down to roughly a factor of two rather than three. On the longer sequential read test with some higher queue depths, the Aura Pro X2 is again more or less tied for first place, and the WD Black SN750 is slightly slower than the other modern drives. Each queue depth is tested for up to one minute or 32GB transferred, from a 64GB test file. Our test of sustained sequential reads uses queue depths from 1 to 32, with the performance scores computed as the average of QD1, QD2 and QD4. The OWC Aura Pro X2 and other modern drives all provide a bit less than 1GB/s on the burst sequential read test, as does the more recent of the two Apple OEM SSDs, while the older Apple drive delivers worse performance than we now expect from a low-end SATA SSD.
Between each burst the drive is given enough idle time to keep the overall duty cycle at 20%. The test averages performance across eight bursts for a total of 1GB of data transferred from a 16GB test file. Our first test of sequential read performance uses short bursts of 128MB, issued as 128kB operations with no queuing.
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