Silicon Power UD90 2000GB

The Silicon Power UD90 (2000GB, 2230 variant) is built on the Phison PS5021-E21T architecture, a 4-channel, DRAM-less controller optimized for PCIe 4.0. To compensate for no onboard DRAM, the drive uses Host Memory Buffer (HMB) to let the controller use a small portion of system RAM for Logical-to-Physical (L2P) translation tables. It is typically paired with Micron 176-layer 3D NAND in this compact 2230 form factor, targeting high-density storage in space-constrained devices such as handheld gaming PCs and ultra-thin laptops. The UD90 is subject to variable component sourcing; while the controller generally remains the Phison E21T, the NAND may vary between TLC and QLC across production batches, which can affect sustained write performance after the pseudo-SLC cache is exhausted. In the 2230 form factor, the concentrated thermal density around the controller makes the drive sensitive to airflow and potentially prone to thermal throttling in devices lacking adequate passive cooling or thermal pads.

Key Specifications

• Interface: PCIe Gen 4.0 x4 (NVMe 1.4)
• Form Factor: M.2 2230 (Single-sided)
• Controller: Phison PS5021-E21T
• NAND Flash: 3D NAND (Historically Micron 176-layer, subject to revision)
• DRAM Cache: None (HMB supported)
• Sequential Read: 5,000 MB/s
• Sequential Write: 3,200 MB/s
• Features: SLC Caching, LDPC Coding, TCG Opal support (firmware dependent)

Hardware Alternatives

• TeamGroup MP44S: Shares the identical controller and often the same NAND configuration, resulting in indistinguishable synthetic performance profiles.
• Sabrent Rocket 2230: Utilizes the same Phison E21T reference design, though often validated with specific firmware revisions for higher sustained IOPS.
• Western Digital SN770M: A proprietary alternative that offers similar sequential throughput and form factor but relies on an in-house SanDisk controller rather than the Phison architecture.
• Corsair MP600 MINI 2000GB: Operates in the same performance tier, frequently utilizing the E21T controller but distinguished by different validation processes.