Crucial P3 Plus 4TB vs Silicon Power UD90 4TB
The site holds no current price for at least one of these, so what follows compares specifications alone.
| Specification | CrucialP3 Plus 4TB | Silicon PowerUD90 4TB |
|---|---|---|
| Capacity (GB) | 4000 | 4000 |
| Sequential read (MB/s) | 4800 | 5000better |
| Sequential write (MB/s) | 4100 | 4800better |
| Current best price | — | — |
| Price per TB | — | — |
| Endurance (TBW) | 800 | 1200better |
| Warranty (years) | 5 | 5 |
| DRAM cache | No | No |
| NAND type | qlc | tlc |
| Controller | Phison E21T | Phison E21 |
How these two compare
Sequential throughput
Crucial P3 Plus 4TB is rated 4800 MB/s read and 4100 MB/s write; Silicon Power UD90 4TB, 5000 MB/s read and 4800 MB/s write. These are peak sequential rates over PCIe — the speed you would see copying one large file. For boot, app launches and everyday feel, random access matters more than this headline figure.
Endurance
The makers warrant 800 TBW on Crucial P3 Plus 4TB and 1200 TBW on Silicon Power UD90 4TB — how much writing each is rated to take before the endurance clause lapses. Most desktop workloads never come close, so read the two against each other rather than as a limit you are likely to reach.
DRAM cache
Crucial P3 Plus 4TB is DRAM-less; Silicon Power UD90 4TB is DRAM-less. A DRAM cache holds the drive's mapping table — the index of where each block physically sits — so the controller places and finds data without an extra flash lookup. A DRAM-less drive borrows a little system memory (HMB) or a slice of its own flash instead, and is likelier to slow once a long run of random writes outlasts its fast cache.
NAND, controller and warranty
NAND: Crucial P3 Plus 4TB uses QLC and Silicon Power UD90 4TB uses TLC. The tier is bits per cell — SLC, MLC, TLC and QLC from one to four — trading density against endurance and sustained-write speed: QLC is cheapest per gigabyte, TLC the mainstream balance, and the denser the cell the sooner sustained writes taper. On the controller: Crucial P3 Plus 4TB uses the Phison E21T, and Silicon Power UD90 4TB uses the Phison E21. It is the chip handling error correction, wear-levelling and where each write lands — much of how a drive holds up under load — even if the part number on its own tells you little. On the cover: Crucial P3 Plus 4TB carries a 5-year warranty, Silicon Power UD90 4TB carries a 5-year warranty. The length is the maker's own vote of confidence, and on an SSD it tends to track the endurance rating — a longer warranty usually meaning more rated writes.
Which to buy
With a price missing for at least one side, there is no cost verdict to give. What separates two otherwise-similar drives is up in the sections above — sustained and random behaviour, whether there is a DRAM cache, the flash tier and the warranty — so weigh those against what your build needs.
Common questions about this pair
- Which is faster, Crucial P3 Plus 4TB or Silicon Power UD90 4TB?
- Crucial P3 Plus 4TB is rated 4800 MB/s read and 4100 MB/s write; Silicon Power UD90 4TB, 5000 MB/s read and 4800 MB/s write. These are peak sequential rates over PCIe — the speed you would see copying one large file. For boot, app launches and everyday feel, random access matters more than this headline figure.
- Should you buy Crucial P3 Plus 4TB or Silicon Power UD90 4TB?
- With a price missing for at least one side, there is no cost verdict to give. What separates two otherwise-similar drives is up in the sections above — sustained and random behaviour, whether there is a DRAM cache, the flash tier and the warranty — so weigh those against what your build needs.