Samsung 970 EVO Plus 250GB

The Samsung 970 EVO Plus 250GB represents a mature execution of Samsung’s vertical integration strategy, utilizing a proprietary in-house design rather than a third-party reference layout. The drive is architected around the Samsung Phoenix controller (S4LR020), backed by 512MB of LPDDR4 DRAM for logical-to-physical mapping tables. Distinct from the non-Plus predecessor, this model utilizes 9x-layer V-NAND 3-bit MLC (TLC), which allows for increased density and latency improvements that effectively saturate the PCIe 3.0 bus in read-heavy scenarios. While the 250GB model offers high throughput, its write performance is physically constrained by the lower count of NAND dies available for interleaving compared to the 1TB and 2TB variants. Field notes: The Phoenix controller is historically known for running hot under sustained loads. To mitigate thermal throttling, the drive features a nickel-coated controller and a heat-spreading copper foil label on the rear PCB, a distinct physical identifier for this series. Analysts have noted that later production runs of the 970 EVO Plus line experienced silent component revisions, swapping the Phoenix controller for the newer "Elpis" controller (down-binned from the PCIe 4.0 980 PRO) and updated NAND; however, the 250GB capacity is less impacted by the performance variances observed in larger revised capacities. Users should be aware that the drive relies on "Intelligent TurboWrite" (dynamic SLC caching); once the cache is saturated, direct-to-TLC write speeds will decrease.

Key Specifications

• Interface: PCIe Gen 3.0 x4 / NVMe 1.3
• Form Factor: M.2 2280 (Single-sided PCB)
• Controller: Samsung Phoenix (S4LR020)
• NAND Flash: Samsung 9x-Layer V-NAND 3-bit MLC (TLC)
• DRAM Cache: 512MB LPDDR4
• Sequential Read/Write: 3,500 MB/s / 2,300 MB/s
• Endurance: 150 TBW
• Security: AES 256-bit Encryption, TCG Opal 2.0, IEEE1667 (Encrypted Drive) support

Hardware Alternatives

• WD Black SN750: The primary contemporary rival. It utilizes a proprietary SanDisk/WD controller and NAND. The SN750 generally competes on par with the 970 EVO Plus in burst performance but is often favored in closed-chassis environments due to slightly more forgiving thermal characteristics.
• SK Hynix Gold P31: A later-generation PCIe 3.0 competitor. While offering similar throughput, the P31 utilizes 128-layer NAND and a controller focused on power efficiency, making it technically superior for laptop battery life compared to the power-hungry Phoenix controller on the Samsung.
• Samsung 970 PRO: The hardware relative utilizing 2-bit MLC NAND. The 970 EVO Plus was designed to offer TLC-based performance that rivaled this MLC predecessor, effectively signaling the end of consumer-grade MLC storage.