Side-by-side: Sabrent Rocket 5 4TB ($739) vs WD_BLACK SN850X 4TB ($535). $/TB winner, specs, real-world picks for July 2026.
This is a generational matchup at 4 TB: the older-gen drive offers proven reliability and better $/TB, while the newer-gen sibling brings raw bandwidth that most users never tap.
Hardware-wise, the Sabrent Rocket 5 4TB runs on an original Phison E26 chip that defined the Gen 5 reference design. The WD_BLACK SN850X 4TB pairs WD's G2 controller — manufactured by SanDisk and tuned for low-latency gaming workloads.
Money matters here — $133.75/TB on the WD_BLACK SN850X 4TB versus $184.75/TB on the Sabrent Rocket 5 4TB. That's enough of a spread that for budget-conscious builders, the WD_BLACK SN850X 4TB becomes the default unless reviews of your specific workload prefer the Sabrent Rocket 5 4TB.
In the read department, the Sabrent Rocket 5 4TB leads by roughly 6 GB/s. The difference is more academic than practical for typical use, but it does matter for video editors moving multi-GB project files.
Write performance separates them too. The Sabrent Rocket 5 4TB sustains 11,600 MB/s writes versus 6,600 MB/s for the WD_BLACK SN850X 4TB — a real advantage for video editors and anyone doing heavy file operations.
For PS5 expansion, both are PCIe Gen 4 M.2 2280 drives that meet Sony's minimum spec (7,300 MB/s read). The console can't take advantage of speeds beyond that, so save money by choosing the WD_BLACK SN850X 4TB. Comparing across generations always invites the same question: does the bandwidth gap convert into user-visible improvements? Honest answer for the Sabrent Rocket 5 4TB vs WD_BLACK SN850X 4TB pairing: only for sustained sequential reads of multi-GB files. For content creators routinely rendering 4K or 8K video, the Sabrent Rocket 5 4TB's 11,600 MB/s sustained write is the deciding factor — multi-GB project files land noticeably faster than on the alternative. Note for handheld gamers: M.2 2280 is the desktop/laptop standard. Steam Deck and the ROG Ally line need 2230 drives — neither Sabrent Rocket 5 4TB nor WD_BLACK SN850X 4TB fits without modification.
Market context: the Sabrent Rocket 5 4TB ranks #4 of 6 Gen 5 4 TB drives we track by $/TB, while the WD_BLACK SN850X 4TB ranks #4 of 6 Gen 4 4 TB drives. Neither cracks the top of the value table, so it's worth glancing at the alternatives below before picking either.
As of July 27, 2026, these tracked drives undercut both the Sabrent Rocket 5 4TB and WD_BLACK SN850X 4TB on $/TB:
Go with the Sabrent Rocket 5 4TB for meaningfully faster reads (14,000 MB/s), and higher sustained writes (11,600 MB/s). Sabrent's Rocket line carries a community reputation for transparent firmware support — manual update tools available directly from the manufacturer.
Go with the WD_BLACK SN850X 4TB for the lower retail price ($535 vs $739), and better $/TB economics ($133.75/TB). Among Gen 4 flagships, the SN850X strikes a sweet spot — premium silicon at sub-Samsung pricing, with WD's established RMA process to back it up.