Compare Samsung 990 EVO Plus 1TB and WD_BLACK SN850X 1TB: prices, speeds, $/TB. Which to buy in May 2026? Full spec breakdown.
Samsung 990 EVO Plus 1TB vs WD_BLACK SN850X 1TB pits two different generations against each other at 1 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 1TB runs on Samsung's Piccolo controller — DRAM-less with PCIe 4.0/5.0 dual-mode support. The WD_BLACK SN850X 1TB pairs the proprietary WD G2 silicon, optimized for the WD_BLACK line.
The WD_BLACK SN850X 1TB carries a dedicated DRAM chip for FTL (Flash Translation Layer) mapping; the Samsung 990 EVO Plus 1TB relies on HMB (Host Memory Buffer), borrowing 64 MB from system RAM. The practical gap shows up only under sustained random write loads.
For PlayStation 5 builds, the console's internal M.2 slot tops out around 5,500 MB/s sustained, so both Samsung 990 EVO Plus 1TB and WD_BLACK SN850X 1TB hit the same wall — pick whichever is cheaper at the moment you buy. 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 1TB 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.
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 1TB if you value the lower retail price ($119 vs $129), better $/TB economics ($119.00/TB), and 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.