Silicon Power UD85 2000GB

The Silicon Power UD85 2TB is an entry-level PCIe 4.0 NVMe drive designed for modern protocol compatibility rather than saturating Gen4 bandwidth. It typically uses the Phison PS5019-E19T DRAM-less controller with Host Memory Buffer (HMB) support, and is frequently paired with high-density QLC NAND to enable the 2TB capacity on a single-sided M.2 2280 PCB. This configuration yields good thermal behavior for laptops with limited airflow but results in reduced sustained write performance once the pseudo-SLC cache is exhausted. Silicon Power performs active BOM revisions on the UD85, so NAND may vary between Micron QLC and various TLC alternatives depending on supply; users report significant throttling in write speeds during large-file transfers (around or exceeding 25–30% of drive capacity).

Key Specifications

• Interface: PCIe 4.0 x4 (NVMe 1.4)
• Sequential Read/Write: 3,600 MB/s Read, 2,800 MB/s Write
• Controller: Phison PS5019-E19T (subject to revision)
• NAND Type: 3D NAND (commonly QLC in higher capacities)
• DRAM Cache: No (HMB support)
• Form Factor: M.2 2280 (single-sided PCB design)
• Encryption: Lacks hardware-based AES-256 encryption support

Hardware Alternatives

• Solidigm P41 Plus: A direct architectural competitor using QLC NAND and targeting the same entry-level Gen4 performance tier, prioritizing read speeds for gaming and general OS tasks over heavy write endurance
• Crucial P3 Plus 2000GB: Shares the market segment of high-capacity, DRAM-less QLC PCIe 4.0 drives with similar sustained write behaviors and burst performance profiles
• Kingston NV2 2000GB: A hardware relative with similar manufacturing philosophy, where the manufacturer guarantees a Gen4 x4 speed tier rather than a fixed internal hardware configuration