Compare Samsung 990 PRO 2TB and WD_BLACK SN850X 4TB: prices, speeds, $/TB. Which to buy in May 2026? Full spec breakdown.
Both run on Gen 4 hardware but at different capacities: 2 TB for the Samsung 990 PRO 2TB versus 4 TB for the WD_BLACK SN850X 4TB. Whether the larger drive's $/TB advantage justifies the higher upfront cost depends on how much you actually need.
Hardware-wise, the Samsung 990 PRO 2TB runs on Samsung's 8nm Pascal controller, the silicon powering the 990 PRO line. The WD_BLACK SN850X 4TB pairs the proprietary WD G2 silicon, optimized for the WD_BLACK line.
There's a modest pricing advantage for the WD_BLACK SN850X 4TB: $89.75/TB compared with $109.50/TB. For typical gaming and productivity, this becomes the deciding factor when specs are close.
On warranty endurance the WD_BLACK SN850X 4TB carries 2,400 TBW against Samsung 990 PRO 2TB's 1,200 TBW. Both will outlast typical use, but the gap matters if you're doing professional content work.
For PS5 expansion, both are PCIe Gen 4 M.2 2280 drives that meet Sony's minimum spec (7,300 MB/s read). The console can't take advantage of speeds beyond that, so save money by choosing the WD_BLACK SN850X 4TB. 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 Samsung 990 PRO 2TB if you value the lower retail price ($219 vs $359). 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 4TB if you value better $/TB economics ($89.75/TB), and a higher TBW endurance rating (2,400 TBW). WD_BLACK's SN850X earned its reputation through consistent sustained performance under gaming workloads — fewer micro-stutters during open-world streaming than budget alternatives.