Compare TeamGroup Z540 1TB and WD_BLACK SN850X 1TB: prices, speeds, $/TB. Which to buy in May 2026? Full spec breakdown.
TeamGroup Z540 1TB vs WD_BLACK SN850X 1TB pits two different generations against each other at 1 TB. The question isn't which is faster on paper — that's settled — it's whether the bandwidth gap shows up in your specific workload.
Hardware-wise, the TeamGroup Z540 1TB runs on the Phison E26 — the first widely-deployed Gen 5 controller, capable but thermally demanding. The WD_BLACK SN850X 1TB pairs the proprietary WD G2 silicon, optimized for the WD_BLACK line.
Price separates these two meaningfully. The WD_BLACK SN850X 1TB costs $119.00/TB versus $189.00/TB for the TeamGroup Z540 1TB — a 37% premium that needs justification in real benchmarks, not just spec-sheet bragging.
Read speeds favor the TeamGroup Z540 1TB: 12,400 MB/s versus 7,300 MB/s for the WD_BLACK SN850X 1TB, a 41% advantage. Sequential-heavy workloads notice; transactional workloads don't.
The TeamGroup Z540 1TB writes about 47% faster (11,800 MB/s vs 6,300 MB/s). Whether that matters depends entirely on what you write to the drive — gameplay capture and large project saves benefit, browsing and gaming do not.
For PlayStation 5 builds, the console's internal M.2 slot tops out around 5,500 MB/s sustained, so both TeamGroup Z540 1TB and WD_BLACK SN850X 1TB hit the same wall — pick whichever is cheaper at the moment you buy. The leap from Gen 4 to Gen 5 doubles peak throughput on paper but produces single-digit-percent improvements in game load times, OS boot, and most productivity benchmarks. The WD_BLACK SN850X 1TB is the better default unless you have a specific workload that needs the extra lanes. Heavy write workloads — video editing, RAW photo libraries, backup operations — favor the TeamGroup Z540 1TB's 11,800 MB/s sustained write speed. Both drives use the 2280 form factor, which is too long for Steam Deck or ROG Ally — you'd need a 2230 variant if either manufacturer offers one, or a dedicated handheld-format drive instead.
Pick the TeamGroup Z540 1TB if you value meaningfully faster reads (12,400 MB/s), and higher sustained writes (11,800 MB/s). The TeamGroup Z540 1TB wins on $/TB because it pairs DRAM-less MAP1602 silicon with low-margin distribution. Performance is fine for OS and gaming, weaker only on sustained random writes.
Pick the WD_BLACK SN850X 1TB if you value the lower retail price ($119 vs $189), and better $/TB economics ($119.00/TB). WD_BLACK's SN850X earned its reputation through consistent sustained performance under gaming workloads — fewer micro-stutters during open-world streaming than budget alternatives.