Samsung 990 EVO 1000GB

The Samsung 990 EVO represents a significant architectural shift for the company’s mainstream lineup, utilizing the proprietary Piccolo controller (S4LY022) fabricated on a 5nm process. The drive uses a DRAM-less architecture with Host Memory Buffer (HMB) support and Samsung V-NAND TLC media, and implements a hybrid interface as a PCIe 4.0 x4 drive that can also operate natively as a PCIe 5.0 x2 link state to reduce lane usage on compatible platforms. Thermal efficiency is strong due to the 5nm controller and lack of onboard DRAM, but sustained write performance can drop once the pseudo-SLC cache is exhausted.

Key Specifications

• Interface: Hybrid PCIe 4.0 x4 / PCIe 5.0 x2 (NVMe 2.0)
• Sequential Speeds: 5000 MB/s Read / 4200 MB/s Write
• Controller: Samsung Piccolo (S4LY022)
• NAND Type: Samsung V-NAND TLC
• DRAM Cache: None (Host Memory Buffer support)
• Encryption: AES 256-bit, TCG/Opal 2.0, Encrypted Drive (IEEE1667)
• Physical Layout: Single-sided M.2 2280 PCB

Hardware Alternatives

• Western Digital WD_BLACK SN770 1000GB: The closest direct technical rival. Both drives utilize proprietary controllers, lack DRAM, and target the mid-to-high PCIe 4.0 performance tier with strong burst speeds but lower sustained write capabilities.
• Lexar NM790 1000GB: Utilizes the Maxio MAP1602 controller. While also DRAM-less, this drive generally saturates the PCIe 4.0 bus (7000 MB/s+), placing it in a higher raw throughput bracket than the 990 EVO despite similar architectural constraints.
• Samsung 970 EVO Plus 1000GB: The spiritual predecessor. Although limited to PCIe 3.0 speeds, the 970 EVO Plus included dedicated DRAM, making it a point of comparison for users sensitive to random I/O latency and sustained heavy workloads.