WD_BLACK SN8100 2TB ($380) vs WD_BLACK SN7100 2TB ($290). $/TB analysis, performance, and use-case recommendations.
When generations cross paths in a comparison like this one, the older-spec drive almost always wins on value while the newer one wins on benchmarks. Whether that benchmark advantage matters depends entirely on what you do with the drive.
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 SN7100 2TB pairs the SanDisk A101 — a more recent design from the WD/SanDisk lineup.
The cheaper drive — WD_BLACK SN7100 2TB at $145.00/TB — saves you $45.00 per TB versus the WD_BLACK SN8100 2TB. Worth it if you're capacity-constrained; either works if you just want one fast drive.
On sequential reads the WD_BLACK SN8100 2TB pulls ahead by 7,650 MB/s (14,900 MB/s versus 7,250 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 6,900 MB/s. Content creators feel this; gamers do not.
Cache architecture differs: WD_BLACK SN8100 2TB has DRAM hardware, WD_BLACK SN7100 2TB uses HMB. For OS, gaming, browsing — indistinguishable. For databases, large file ops, or 4K video editing — DRAM has a small but consistent edge.
For PS5 expansion, both are PCIe Gen 4 M.2 2280 drives that meet Sony's minimum spec (7,250 MB/s read). The console can't take advantage of speeds beyond that, so save money by choosing the WD_BLACK SN7100 2TB. The Gen 5 WD_BLACK SN8100 2TB pulls ahead on sequential bandwidth, but Gen 5 advantages rarely surface during everyday tasks — most software hasn't been rewritten to exploit 14,000+ MB/s pipelines. 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 SN7100 2TB ranks #3 of 11 Gen 4 2 TB drives. One of them is genuinely among the cheapest options in its class, so this matchup includes a real value pick.
As of July 27, 2026, these tracked drives undercut both the WD_BLACK SN8100 2TB and WD_BLACK SN7100 2TB on $/TB:
The WD_BLACK SN8100 2TB is the right call if meaningfully faster reads (14,900 MB/s), higher sustained writes (11,000 MB/s), and a dedicated DRAM cache chip matter to you.
The WD_BLACK SN7100 2TB is the right call if the lower retail price ($290 vs $380), and better $/TB economics ($145.00/TB) matter to you.