OWC
OWC Envoy Pro FX 4TB
USB4 · 2800/2800 MB/s · 4TB
90
/ 100
From $884
VS
Western Digital
WD_BLACK SN850X 2 TB
PCIe 4.0 · 7300 MB/s · Heatsink option
90
/ 100
From $219
Specdex verdict
Dead heat — it comes down to priorities.
In our weighted Specdex score, OWC Envoy Pro FX 4TB lands at 90 and WD_BLACK SN850X 2 TB at 90. With scores tied, the decision hinges on which sub-scores matter most to you.
Pick OWC Envoy Pro FX 4TB if…
- ✓Plug-and-play (portable)
- ✓Competitive per-GB cost
- ✓3-5 year warranties typical
Pick WD_BLACK SN850X 2 TB if…
- ✓Best PCIe 4.0 sustained speed under load
- ✓5-year warranty
- ✓Excellent gaming/load times
OWC Envoy Pro FX 4TB 90
vs 90 WD_BLACK SN850X 2 TB
Score breakdown
OWC Envoy Pro FX 4TB
90 read 88
write 84
endurance 84
value 88
speed 0
software 0
reliability 0
WD_BLACK SN850X 2 TB
90 read 0
write 0
endurance 92
value 88
speed 92
software 86
reliability 96
Specs side-by-side
| Spec | OWC Envoy Pro FX 4TB | WD_BLACK SN850X 2 TB |
|---|---|---|
| Interface | USB4 | PCIe 4.0 x4 NVMe 1.4 |
| Capacity | ▲ 4TB | 1 / 2 / 4 / 8 TB |
| Read/Write | 2800/2800 MB/s | — |
| Release year | 2021 | — |
| Sequential read | — | 7300 MB/s |
| Sequential write | — | 6600 MB/s |
| NAND | — | BiCS5 TLC |
| Endurance | — | 1200 TBW (2TB) |
| Warranty | — | 5 years |
OWC Envoy Pro FX 4TB
Pros
- +Plug-and-play (portable)
- +Competitive per-GB cost
- +3-5 year warranties typical
Cons
- −Portable variants are USB-only
- −SATA models capped ~550 MB/s
- −DRAM-less drives slower sustained
WD_BLACK SN850X 2 TB
Pros
- +Best PCIe 4.0 sustained speed under load
- +5-year warranty
- +Excellent gaming/load times
Cons
- −PCIe 4.0 not 5.0
- −Game Mode 2.0 is software gimmick
- −Premium pricing per TB
FAQ: OWC Envoy Pro FX 4TB vs WD_BLACK SN850X 2 TB
Which is better, OWC Envoy Pro FX 4TB or WD_BLACK SN850X 2 TB? +
Both score 90 on our weighted rubric — tied. Your best pick depends on the sub-scores above.
Is OWC Envoy Pro FX 4TB worth the price? +
At $884, OWC Envoy Pro FX 4TB delivers a Specdex score of 90 — strongest in read.
Is WD_BLACK SN850X 2 TB worth the price? +
At $219, WD_BLACK SN850X 2 TB delivers a Specdex score of 90 — strongest in reliability.
Does OWC Envoy Pro FX 4TB or WD_BLACK SN850X 2 TB last longer? +
Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.