Silicon Power UD90 1TB -- Phison E21T PCIe 4.0 Budget NVMe Review (2026)
The Silicon Power UD90 1 TB is a budget PCIe 4.0 NVMe SSD built on the Phison E21T DRAM-less controller, delivering mid-range Gen4 performance at aggressive pricing.
Controller & Memory
The UD90 uses the Phison PS5021-E21T controller — a PCIe 4.0 x4 design that is DRAM-less and relies on Host Memory Buffer (HMB). At 1 TB it is rated at 4,800 MB/s reads and 4,200 MB/s writes. Endurance is 600 TBW, backed by a five-year warranty. The single-sided PCB fits thin laptops.
The UD90 is positioned in the budget Gen4 tier, competing with the Kingston NV2, WD Blue SN580, and HP FX900. The E21T controller delivers solid Gen4 read speeds while keeping costs down by eliminating the DRAM cache. For gamers, office users, and budget builders, the UD90 offers a good balance of capacity, performance, and price.
Storage Comparisons:
UD90 Performance & Benchmarks
The 1 TB UD90 delivers 4,800/4,200 MB/s sequential reads and writes. The HMB architecture provides adequate random I/O for light-to-moderate desktop use. Under sustained writes, the drive transitions to native NAND speeds faster than DRAM-equipped alternatives. Gaming load times are competitive with any PCIe 4.0 drive.
Silicon Power UD90 1 TB vs M.2 4.0 x 4 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 4.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- Patriot Viper PV593 1 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 2 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 4 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV573 2 TB: 14,000 MB/s read, 12,000 MB/s write
- Silicon Power UD90 1 TB (this drive): 4,800 MB/s read, 4,200 MB/s write
Silicon Power UD90 vs Competitors
See how the UD90 stacks up against other M.2 4.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Silicon Power covers the UD90 1 TB with a five-year warranty limited by 600 TBW, equivalent to roughly 328 GB/day over five years. The 2 TB model carries 1,200 TBW.
Silicon Power UD90 1 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 1 TB |
| Interface [?] | M.2 4.0 x 4 |
| Controller [?] | Phison E21T |
| Memory type [?] | Micron TLC |
| DRAM [?] | HMB |
| Read speed (MB/s) [?] | 4800 |
| Write speed (MB/s) [?] | 4200 |
| Read IOPS [?] | 739000 |
| Write IOPS [?] | 739000 |
| Endurance (TBW) [?] | 600 |
| MTBF (million hours) [?] | 1500000 |
| Warranty (years) [?] | 5 |
Verdict: Is the UD90 Worth It in 2026?
The 1 TB UD90 is Silicon Power's strongest budget Gen4 offering. Its 4,800/4,200 MB/s speeds are competitive with the WD Blue SN580 1 TB and Kingston NV2 1 TB. The 600 TBW endurance is adequate for any consumer workload. The DRAM-less design means it is not ideal for sustained professional workloads. Choose based on which of the three budget options is cheapest at the time of purchase.
+ Pros
- 4,800/4,200 MB/s -- solid budget Gen4 speeds
- Phison E21T -- efficient DRAM-less controller
- 600 TBW endurance with 5-year warranty
- Single-sided PCB -- thin-laptop compatible
- Aggressive pricing
- Cons
- No DRAM -- slower sustained random I/O
- Below mid-range Gen4 speeds
- Silicon Power brand less recognized globally
Buy this or similar SSD Storage:
Video Review
Новый PCIe 4.0 безбуферник - SSD Silicon Power UD90 1TB (SP01KGBP44UD9005)
