Interface
Samsung 990 EVO Plus 2TBPCIe 4.0 ×4 / 5.0 ×2 / NVMe 2.0
Samsung 990 PRO 2TBPCIe 4.0 ×4 / NVMe 2.0
990 EVO Plus or 990 PRO, both 2 TB?
Editorial specification comparison · checked 23 October 2026
Similar names hide a cache difference. Samsung specifies HMB for the EVO Plus and 2 GB of DRAM for the 2 TB 990 PRO. Host memory is different from dedicated DRAM on the SSD.
Sequential figures are manufacturer peaks. They do not reveal sustained speed once a write buffer fills. Consider your workload and independent sustained-write tests.
Both have 1,200 TBW at this capacity and a limited warranty up to five years. Time and written volume both matter. Check the exact MPN and cooling clearance; these linked variants have no factory heatsink.
Compare all specification differences ⇄What changes?
The differences at a glance
Manufacturer facts for these exact variants. The order does not declare a performance winner.
DRAM cache
Samsung 990 EVO Plus 2TBUnknown
Samsung 990 PRO 2TB2 GB
Cache arrangement
Samsung 990 EVO Plus 2TBHMB (Host Memory Buffer)
Samsung 990 PRO 2TB2 GB DRAM
990 EVO Plus 2TB: 1 unknown fields · 990 PRO 2TB: 3 unknown fields. Unknown does not mean absent.
Compare capacity and cache, not just peak speed
Manufacturer speeds are maxima under stated test conditions. They do not show sustained writing after the cache fills. TBW is a write-endurance warranty limit, not a predicted failure date; time limits also apply. Check M.2 length, interface and heatsink clearance in the host manual. Price per TB uses nominal decimal capacity and a confirmed delivered total.