Side-by-side: TeamGroup Z540 2TB ($329) vs WD_BLACK SN850X 2TB ($199). $/TB winner, specs, real-world picks for May 2026.
This is a generational matchup at 2 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 TeamGroup Z540 2TB runs on an original Phison E26 chip that defined the Gen 5 reference design. The WD_BLACK SN850X 2TB pairs WD's G2 controller — manufactured by SanDisk and tuned for low-latency gaming workloads.
Money matters here — $99.50/TB on the WD_BLACK SN850X 2TB versus $164.50/TB on the TeamGroup Z540 2TB. That's enough of a spread that for budget-conscious builders, the WD_BLACK SN850X 2TB becomes the default unless reviews of your specific workload prefer the TeamGroup Z540 2TB.
In the read department, the TeamGroup Z540 2TB leads by roughly 5 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 TeamGroup Z540 2TB sustains 11,800 MB/s writes versus 6,600 MB/s for the WD_BLACK SN850X 2TB — 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 2TB. Comparing across generations always invites the same question: does the bandwidth gap convert into user-visible improvements? Honest answer for the TeamGroup Z540 2TB vs WD_BLACK SN850X 2TB pairing: only for sustained sequential reads of multi-GB files. For content creators routinely rendering 4K or 8K video, the TeamGroup Z540 2TB's 11,800 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 TeamGroup Z540 2TB nor WD_BLACK SN850X 2TB fits without modification.
Go with the TeamGroup Z540 2TB for meaningfully faster reads (12,400 MB/s), and higher sustained writes (11,800 MB/s). Budget-tier drives like the TeamGroup Z540 2TB have closed the gap with premium NVMes — the MAP1602 controller is genuinely competitive for everyday workloads at half the price.
Go with the WD_BLACK SN850X 2TB for the lower retail price ($199 vs $329), and better $/TB economics ($99.50/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.