Compare Samsung 990 EVO Plus 2TB and WD_BLACK SN850X 2TB: prices, speeds, $/TB. Which to buy in September 2026? Full spec breakdown.
Samsung 990 EVO Plus 2TB vs WD_BLACK SN850X 2TB pits two different generations against each other at 2 TB. The question isn't which is faster on paper — that's settled — it's whether the bandwidth gap shows up in your specific workload.
Hardware-wise, the Samsung 990 EVO Plus 2TB runs on Samsung's Piccolo controller — DRAM-less with PCIe 4.0/5.0 dual-mode support. The WD_BLACK SN850X 2TB pairs the proprietary WD G2 silicon, optimized for the WD_BLACK line.
The WD_BLACK SN850X 2TB carries a dedicated DRAM chip for FTL (Flash Translation Layer) mapping; the Samsung 990 EVO Plus 2TB relies on HMB (Host Memory Buffer), borrowing 64 MB from system RAM. The practical gap shows up only under sustained random write loads.
If this purchase is for a PS5 storage expansion, the comparison flattens — Sony's PCIe Gen 4 controller normalizes both Samsung 990 EVO Plus 2TB and WD_BLACK SN850X 2TB to roughly equal in-game load times. The cheaper drive is the smart pick. The leap from Gen 4 to Gen 5 doubles peak throughput on paper but produces single-digit-percent improvements in game load times, OS boot, and most productivity benchmarks. The WD_BLACK SN850X 2TB is the better default unless you have a specific workload that needs the extra lanes. 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.
Market context: the Samsung 990 EVO Plus 2TB ranks #4 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 is a value leader right now — if $/TB is your priority, check the cheaper alternatives below before committing.
As of September 7, 2026, these tracked drives undercut both the Samsung 990 EVO Plus 2TB and WD_BLACK SN850X 2TB on $/TB:
Pick the Samsung 990 EVO Plus 2TB if you value the lower retail price ($370 vs $390), and better $/TB economics ($185.00/TB). The 990 EVO Plus uniquely supports both PCIe 4.0 x4 and PCIe 5.0 x2 modes — useful flexibility if you might upgrade motherboard generations.
Pick the WD_BLACK SN850X 2TB if you value a dedicated DRAM cache chip. WD_BLACK's SN850X earned its reputation through consistent sustained performance under gaming workloads — fewer micro-stutters during open-world streaming than budget alternatives.