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OWC Envoy Pro EX SSD: Speed vs Transfer Size
Related: Other World Computing, OWC Envoy Pro, OWC Envoy Pro EX, SSD, storage, Thunderbolt, Thunderbolt 3, USB, USB-C
This page evaluates speed for various I/O transfer sizes of the OWC Envoy Pro EX Thunderbolt 3 vs the USB-C model, both 4TB capacity.
Test results: speed vs capacity
disktester run-sequential-suite -i 5 --test-size 4GB
Speed always varies with transfer size, whether on hard drives or SSDs. There is always overhead e.g., writing 1MB as thirty-two 32K transfers is far less efficient than writing 1MB as a single transfer). With RAID-0 and RAID-5, the striping aspect means that the transfer is split into blocks across drives, the “stripe size” being the determinant of how the transfer is split up.
As with the fill-volume results, the OWC Envoy Pro EX Thunderbolt 3 model easily outperforms the USB-C model for reads, doubling or tripling its performance for very small transfers (32/64/128/256K). Since small transfers (1MB and less) are by far the most common I/O sizes, this is highly significant for general purpose use.
For large transfers, the Thunderbolt 3 model is about 2.5X faster for reads, and about 44% faster for writes.
Assuming a Thunderbolt 3 port is available, it is a no-brainer in favor of the Thunderbolt 3 model unless minimizing size/weight is a primary consideration. The USB-C model is still worthy of praise—it achieves about a gigabyte per second in about 2/3 the size and weight, blazingly fast by most measures.
Vertical scale is MB/sec. Horizontal scale shows I/O transfer size.