Compare TeamGroup Z540 2TB and Lexar NM790 2TB: prices, speeds, $/TB. Which to buy in May 2026? Full spec breakdown.
TeamGroup Z540 2TB vs Lexar NM790 2TB pits two different generations against each other at 2 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 2TB runs on the Phison E26 — the first widely-deployed Gen 5 controller, capable but thermally demanding. The Lexar NM790 2TB pairs MaxioTech's MAP1602 silicon, the default choice for budget Gen 4 drives in 2024-2026.
Price separates these two meaningfully. The Lexar NM790 2TB costs $74.50/TB versus $164.50/TB for the TeamGroup Z540 2TB — a 55% premium that needs justification in real benchmarks, not just spec-sheet bragging.
Read speeds favor the TeamGroup Z540 2TB: 12,400 MB/s versus 7,400 MB/s for the Lexar NM790 2TB, a 40% advantage. Sequential-heavy workloads notice; transactional workloads don't.
The TeamGroup Z540 2TB writes about 45% faster (11,800 MB/s vs 6,500 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.
The TeamGroup Z540 2TB carries a dedicated DRAM chip for FTL (Flash Translation Layer) mapping; the Lexar NM790 2TB relies on HMB (Host Memory Buffer), borrowing 64 MB from system RAM. The practical gap shows up only under sustained random write loads.
Heading to a PlayStation 5? Both drives drop into the console's M.2 bay and report identical real-world benchmarks since the PS5 caps storage at PCIe 4.0 speeds. The Lexar NM790 2TB wins this matchup on $/TB. 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 Lexar NM790 2TB 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 2TB'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 2TB if you value meaningfully faster reads (12,400 MB/s), higher sustained writes (11,800 MB/s), and a dedicated DRAM cache chip. The TeamGroup Z540 2TB 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 Lexar NM790 2TB if you value the lower retail price ($149 vs $329), and better $/TB economics ($74.50/TB). Budget-tier drives like the Lexar NM790 2TB have closed the gap with premium NVMes — the MAP1602 controller is genuinely competitive for everyday workloads at half the price.