Silicon Power UD90 1000GB

The Silicon Power UD90 (M.2 2230 variant) is a mid-range PCIe 4.0 NVMe drive built on the DRAM-less Phison PS5021-E21T four-channel controller. It commonly ships with high-density 3D NAND (initial batches often used Micron 176-layer TLC, while later revisions may include QLC or other vendors), and relies on Host Memory Buffer (HMB) to let the controller use a portion of the host system RAM for mapping tables. The design balances thermal output and power consumption for the bandwidth of PCIe Gen4 in space-constrained, low-airflow devices.

Key Specifications

• Interface: PCIe Gen 4.0 x4, NVMe 1.4
• Form Factor: M.2 2230 (30mm length)
• Controller: Phison PS5021-E21T (4-channel)
• NAND Flash: 3D NAND (TLC or QLC dependent on revision)
• Sequential Read/Write: Up to 4,900 MB/s / 3,200 MB/s
• DRAM Cache: No (HMB support)
• Endurance (TBW): Rated at 600 TBW (for 1TB TLC variants; QLC variants may differ)
• PCB Layout: Single-sided (critical for compatibility with ultra-thin laptops and handheld consoles)

Hardware Alternatives

• Sabrent Rocket 1000GB: The Sabrent Rocket 2230 is historically the most consistent regarding the use of Micron TLC NAND, serving as the performance baseline for this Phison E21T architecture.
• TEAMGROUP MP44S 1000GB: Another direct hardware clone utilizing the Phison E21T controller; more frequently associated with QLC NAND configurations, positioning it closer to the UD90 in terms of potential hardware variability.
• Western Digital WD_BLACK SN770 1000GB: A direct performance competitor using a proprietary Western Digital (SanDisk) controller, occupying the same form factor and performance tier but not sharing the Phison architecture.