Samsung 990 EVO 2000GB

The Samsung 990 EVO represents a distinct architectural departure from its predecessors, transitioning the EVO line to a DRAM-less design anchored by Samsung’s proprietary Piccolo (S4LY022) controller. Manufactured on a 5nm process, this controller utilizes Host Memory Buffer (HMB) technology—allocating system RAM for the translation layer—rather than onboard DRAM, and pairs it with Samsung's 133-layer (V6 Prime) V-NAND TLC. The drive supports both PCIe 4.0 x4 and PCIe 5.0 x2; the PCIe 5.0 x2 capability allows the drive to achieve maximum performance using only two lanes on compatible platforms, reducing power draw and accommodating lane-limited designs. The engineering prioritizes power efficiency and thermal management over saturating the PCIe 4.0 bus. The 5nm controller offers best-in-class power efficiency, resulting in exceptionally low operating temperatures and rare thermal throttling. Enthusiasts transitioning from the Samsung 970 EVO Plus 2000GB should note the latency implications of the DRAM-less architecture; sustained write tests reveal that once the pseudo-SLC cache is exhausted, transfer speeds drop significantly, characteristic of HMB-based storage solutions.

Key Specifications

• Interface: PCIe 4.0 x4 / PCIe 5.0 x2 (NVMe 2.0)
• Sequential Read/Write: 5,000 MB/s / 4,200 MB/s
• Controller: Samsung S4LY022 Piccolo (5nm)
• NAND: Samsung V-NAND TLC (133-Layer V6 Prime)
• DRAM Cache: None (HMB Support, 64MB)
• Endurance: 1200 TBW
• Encryption: AES 256-bit Full Disk Encryption, TCG/Opal V2.0

Hardware Alternatives

• Western Digital WD_BLACK SN770 2000GB: The primary architectural rival. Both drives utilize proprietary in-house controllers and a DRAM-less design to achieve mid-to-high-tier PCIe 4.0 performance. The SN770 generally offers higher burst speeds, while the 990 EVO emphasizes efficiency.
• Lexar NM790 2000GB: Represents the "Maxio MAP1602" reference design competitors. While the NM790 often outperforms the 990 EVO in raw throughput, the Samsung drive offers broader software support (Magician) and TCG Opal encryption, which many consumer Maxio-based drives lack.
• Samsung 990 PRO 2000GB: The distinct step up in the hierarchy. Users requiring sustained write performance or reduced latency should look to the PRO, which utilizes the Pascal controller and dedicated LPDDR4 DRAM.