The Western Digital WD Black SN770 1TB wins in 2 out of 7 comparable specs. Its biggest advantage is Sequential Write (17% better).
UD90 1TB wins in 1 spec (MSRP: 18% better).
Recommendation
Choose WD Black SN770 1TB if you want the best overall performance — especially sequential write.
Choose UD90 1TB if msrp matters more to you.
| Spec | Silicon PowerUD90 1TB | Western DigitalWD Black SN770 1TB |
|---|---|---|
| Storage | ||
| Capacity | 1000 GB | 1000 GB |
| Type | NVMe SSD | NVMe SSD |
| Interface | PCIe Gen4 x4 | PCIe Gen4 x4 |
| Form Factor | M.2-2280 | M.2-2280 |
| NAND Type | TLC | TLC |
| Performance | ||
| Sequential Read | 4,800 MB/s | 5,150 MB/s+7% |
| Sequential Write | 4,200 MB/s | |
| 4,900 MB/s+17% |
| Endurance (TBW) | 600 | 600 |
| Features | ||
| DRAM Cache | No | No |
| Platform | ||
| Controller | Phison PS5021-E21T | WD in-house |
| PCIe Gen | 4 | 4 |
| Price | ||
| MSRP | $45−18% | $55 |
| Release Date | Mar 2023 | Feb 2022 |
