WD Black SN850X

The 25 top-voted comments (of 162 total; HackerNews) come from a technically expert crowd and are mostly general SSD/storage debate — only a handful directly reference the SN850/SN850X. Direct points: (1) AnandTech charts cited showing >7 GB/s sequential 128k reads at queue depth 16, described as more than 2x an Intel Optane P4800X at under a tenth of the price; an HPC admin adds this class of PCIe 4.0 drive is 'every bit as fast as the enterprise grade NVMe drives.' (2) Dynamic SLC cache behavior: with ample erased space the drive sustains ~5000 MB/s writes, dropping to ~2000 MB/s as the SLC fills; the SN850 'requires less erased space' than the Samsung 980 Pro (which 'hits a cliff at about 75% written'), and one commenter advises keeping ~30% of the drive free. (3) Recurring skepticism: 'The use case is benchmarks basically, and maybe faster cold boots' — typical users unlikely to notice NVMe vs SATA outside full-disk searches; heatsinks 'only delay thermal throttling' since drives still hit 100C without airflow; Windows benchmark tools misreport NVMe write performance depending on buffer-flush settings. (4) General warning that SSD hardware encryption 'should not be trusted' (citing 2018 research), though not tested on this model. Net: experts respect the raw performance and price/performance while questioning whether everyday users will feel it.

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