Compare Samsung 990 PRO 1TB and WD_BLACK SN850X 1TB: prices, speeds, $/TB. Which to buy in May 2026? Full spec breakdown.
Both the Samsung 990 PRO 1TB and WD_BLACK SN850X 1TB sit in the Gen 4 category at 1 TB, so the matchup turns on controller efficiency, cache topology, and current pricing rather than raw class differences.
Hardware-wise, the Samsung 990 PRO 1TB runs on Samsung's 8nm Pascal controller, the silicon powering the 990 PRO line. The WD_BLACK SN850X 1TB pairs the proprietary WD G2 silicon, optimized for the WD_BLACK line.
There's a modest pricing advantage for the WD_BLACK SN850X 1TB: $119.00/TB compared with $135.00/TB. For typical gaming and productivity, this becomes the deciding factor when specs are close.
If this purchase is for a PS5 storage expansion, the comparison flattens — Sony's PCIe Gen 4 controller normalizes both Samsung 990 PRO 1TB and WD_BLACK SN850X 1TB to roughly equal in-game load times. The cheaper drive is the smart pick. Heavy write workloads — video editing, RAW photo libraries, backup operations — favor the Samsung 990 PRO 1TB's 6,900 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.
Samsung's PRO line has the longest track record for firmware reliability — over a decade of consumer SSDs with global RMA support.
Pick the WD_BLACK SN850X 1TB if you value the lower retail price ($119 vs $135), 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.