Silicon Power UD90 1TB
Score: 80/100
Samsung 990 EVO 2TB
Score: 87/100Rankings
The Samsung 990 EVO 2TB offers a balanced mix of high random performance, strong power efficiency and modern PCIe flexibility, making it ideal for laptops and compact PCs. Its DRAM-less design keeps costs and power low, though heavy write workloads may see a slowdown once the cache is depleted.
The Silicon Power UD90 1TB PCIe 4.0 SSD delivers flagship-class sequential speeds at a budget price, but its DRAM-less design and lack of a heatsink lead to thermal concerns and mixed reliability reports.
| Attribute | | |
|---|---|---|
1,000 GB | 2,000 GBbest | |
5,000 MB/sbest | 5,000 MB/sbest | |
4,800 MB/sbest | 4,200 MB/s | |
570,000 IOPS | 700,000 IOPSbest | |
600,000 IOPS | 800,000 IOPSbest | |
600 TBW | 1,200 TBWbest | |
5 yearsbest | 5 yearsbest | |
| ↓ lower better | — | 5.5 Wbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Performance(4) | ||
Sequential Write Speed (MB/s) | 4800 MB/s | 4200 MB/s |
Random Read IOPS (IOPS) | 570000 IOPS | 700000 IOPS |
Random Write IOPS (IOPS) | 600000 IOPS | 800000 IOPS |
Interface | PCIe Gen4 x4 | PCIe 4.0 x4 / PCIe 5.0 x2 |
Storage(3) | ||
Capacity (GB) | 1000 GB | 2000 GB |
NAND Type | TLC | 133-layer V-NAND TLC |
Endurance (TBW) (TBW) | 600 TBW | 1200 TBW |
Design & Build(2) | ||
Weight (g) | 8 g | 9 g |
Thickness (mm) | 3.5 mm | 2.38 mm |
Products in the top-left offer the best value (high score, low price).
Professional reviewers praise the UD90 as a value champion with strong sequential performance, but caution about heat and the absence of an included heatsink.
Everyday users love the fast boot and gaming responsiveness, yet many complain about overheating, premature failures, and occasional data corruption.
“"new Value Champion" - Tom's Hardware”
“"great deal" for 1TB of PCIe 4.0 storage”
“"sudden drive death within months"”
Professional reviewers praise the 990 EVO for its flexible dual-mode PCIe support, strong power efficiency and solid random performance, while noting that raw sequential speeds lag behind flagship models and sustained writes are not class-leading.
Everyday users rate the drive highly, highlighting easy installation, fast boot times and noticeable gains over older SATA or PCIe 3.0 SSDs, with occasional complaints about the lack of a heatsink and DRAM-less architecture.
