Side-by-side: WD_BLACK SN8100 2TB ($380) vs WD_BLACK SN850X 2TB ($348). $/TB winner, specs, real-world picks for July 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 WD_BLACK SN8100 2TB runs on SMI's SM2508 silicon, which became the default Gen 5 controller for power-conscious flagships. The WD_BLACK SN850X 2TB pairs WD's second-generation G2 in-house controller, tuned for sustained gaming I/O.
Prices favor the WD_BLACK SN850X 2TB by $16.00/TB ($174.00/TB versus $190.00/TB). Not a huge gap, but enough to be the tiebreaker if performance is similar.
On sequential reads the WD_BLACK SN8100 2TB pulls ahead by 7,600 MB/s (14,900 MB/s versus 7,300 MB/s). That matters for moving large files but rarely shows up in game loads.
Write speeds skew toward the WD_BLACK SN8100 2TB: 11,000 MB/s sustained against 6,600 MB/s. Content creators feel this; gamers do not.
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 WD_BLACK SN850X 2TB wins this matchup on $/TB. Comparing across generations always invites the same question: does the bandwidth gap convert into user-visible improvements? Honest answer for the WD_BLACK SN8100 2TB vs WD_BLACK SN850X 2TB pairing: only for sustained sequential reads of multi-GB files. Video editors will gravitate toward the WD_BLACK SN8100 2TB for its write headroom (11,000 MB/s sustained). Project saves and proxies move faster, which compounds across a workday. Heads-up — these are full-length 2280 drives. Steam Deck and most current handhelds require shorter 2230 modules, so check capacity-specific 2230 variants if that's your target platform.
Market context: the WD_BLACK SN8100 2TB ranks #5 of 11 Gen 5 2 TB drives we track by $/TB, while the WD_BLACK SN850X 2TB ranks #8 of 11 Gen 4 2 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 WD_BLACK SN8100 2TB and WD_BLACK SN850X 2TB on $/TB:
Go with the WD_BLACK SN8100 2TB for meaningfully faster reads (14,900 MB/s), and higher sustained writes (11,000 MB/s).
Go with the WD_BLACK SN850X 2TB for the lower retail price ($348 vs $380), and better $/TB economics ($174.00/TB). The SN850X has been the best-selling Gen 4 NVMe in PCPartPicker builds for two consecutive years — Game Mode 2.0 prioritizes I/O when supported titles need it.