Silicon Power UD90 250GB - Budget PCIe 4.0 NVMe SSD (2026)

Name: Silicon Power UD90 250 GB
Brand: Silicon Power
SKU: silicon-power-ud90-250-gb
Rating: 3.8 (19 reviews)

Posted on May 17, 2026 by Raymond Chen

The Silicon Power UD90 250GB is one of the cheapest PCIe 4.0 NVMe drives on the market - Phison's PS5021-E21T DRAM-less controller, Micron 176-layer TLC NAND in HMB mode, and a five-year warranty at near-PCIe-3.0 prices.

Silicon Power UD90 250GB - Budget PCIe 4.0 NVMe SSD

Controller & Memory

The Silicon Power UD90 250 GB pairs Phison's four-channel PS5021-E21T controller with 3D TLC NAND - typically Micron 176-layer in current production batches, though Silicon Power has shipped the UD90 with various TLC NAND vendors over the product's life. There is no on-board DRAM cache; the drive uses Host Memory Buffer (HMB) to borrow a small slice of system RAM for the logical-to-physical mapping table. The PCB is single-sided M.2 2280 which fits any current motherboard or laptop M.2 slot. The E21T is Phison's budget PCIe 4.0 controller and the same silicon used in many other low-cost PCIe 4.0 NVMe drives launched in 2022-2024.

Silicon Power ships the UD90 in 250 GB, 500 GB, 1 TB, 2 TB, and 4 TB capacities. The 250 GB SKU on this page is the entry boot-drive option in the line, intended for users replacing a SATA SSD or hard drive in an older system. Sequential write performance is materially lower on the 250 GB than on larger capacities because the E21T has fewer NAND dies to fan out across - typical of a four-channel controller running at one or two dies per channel at small capacities. Silicon Power is a Taiwanese brand with global retail distribution and decent regional warranty support, particularly in Asia-Pacific, Europe, and North America.

The UD90 250 GB targets builders who want a basic PCIe 4.0 boot drive at the cheapest possible price, or who need a small NVMe to retire an older SATA boot disk. Direct rivals at this capacity and tier are the WD Blue SN570 250 GB (PCIe 3.0, DRAM-less, similar price), the Crucial P3 Plus 500 GB (next size up, similar price), and the Kingston NV2 250 GB (also Phison budget HMB). Most modern builds skip 250 GB and start at 500 GB or 1 TB, where capacity-specific specs improve dramatically.

Storage Comparisons:

Best PCIe 4.0 SSD Drive Best Deal of 1 TB SSDs NVME Top 2 TB SSDs

UD90 Performance & Benchmarks

Manufacturer ratings for the UD90 250 GB land at around 4,800 MB/s sequential reads with capacity-specific writes well below the line's flagship - typical of an E21T design with limited NAND parallelism at small capacities. Random performance reaches roughly 739,000 read IOPS on the published spec sheet, which is at the top of the budget PCIe 4.0 segment thanks to the E21T's efficient command handling. Independent reviewers at Tom's Hardware, TechPowerUp, PCWorld and StorageReview consistently measured CrystalDiskMark sequential reads close to the rated value, with the drive showing the typical budget HMB profile - snappy QD1 reads, competent QD8/QD16 scaling, weaker sustained random writes than a DRAM-equipped peer.

Performance comparison

Silicon Power UD90 250 GB 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 250 GB (this drive): 4,800 MB/s read, 4,200 MB/s write

Sustained writes are the area where the 250 GB capacity and DRAM-less design combine into a clear limitation. With limited NAND parallelism and no on-board DRAM, the drive falls into the TLC direct-write rate after a relatively small SLC cache window of perhaps 30-50 GB. For boot, application, and gaming workloads on a 250 GB drive that profile is invisible because the workloads do not produce sustained writes at this scale. For sustained capture or large dataset moves the limit is more visible; in either case, a 250 GB drive is rarely the right tool for write-heavy workloads. DirectStorage operates as expected on a supported PCIe 4.0 platform, though most current titles benefit from larger drives that can hold the full asset library.

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:

Team Group Cardea Zero Z440 256 GB HP FX 900 256 GB Western Digital Black SN770 250 GB

Endurance, TBW & Warranty

Silicon Power backs the UD90 250 GB with a five-year limited warranty - competitive with the segment standard and a notable strength for a budget-priced drive. The TBW endurance scales with capacity across the line; the 250 GB tier sits at the bottom of the published endurance range, around 200 TBW. At a typical 10-20 GB/day desktop write workload that budget lasts roughly 27-55 years - far past the warranty window and well beyond any realistic service life. The published MTBF is 1.5 million hours, a population statistic rather than a per-drive promise. Silicon Power handles consumer RMA through regional distributors and the company's own support portal at silicon-power.com. The five-year warranty length is competitive on paper but the actual RMA experience varies by region - North American and European buyers report consistently smooth claims, while smaller markets occasionally see slower processing.

Silicon Power UD90 250 GB Specifications

Category	Value
Capacity [?]	250 GB
Interface [?]	M.2 4.0 x 4
Controller [?]	Phison E21T
Memory type [?]	Micron TLC
DRAM [?]	No (HMB)
Read speed (MB/s) [?]	4800
Write speed (MB/s) [?]	4200
Read IOPS [?]	739000
Write IOPS [?]	739000
Endurance (TBW) [?]	600
MTBF (million hours) [?]	1.5
Warranty (years) [?]	5

Verdict: Is the UD90 Worth It in 2026?

The Silicon Power UD90 250 GB is a sensible pick only for buyers replacing an older SATA SSD on the cheapest possible budget, or for a secondary OS drive on a multi-disk build. Anyone building or upgrading in 2026 should jump straight to the 500 GB or 1 TB UD90 - the per-gigabyte cost difference is small and the larger capacities deliver materially higher write performance and longer SLC cache windows. Buyers chasing performance at this price tier should consider the WD Black SN770 500 GB or Crucial P3 Plus 500 GB instead, both of which offer better sustained writes and equivalent or longer warranty. As a pure entry-level boot drive at the cheapest practical NVMe price, the UD90 250 GB does the job but offers little reason to choose over its 500 GB sibling.

+ Pros

PCIe 4.0 generation at near-PCIe-3.0 pricing
5-year limited warranty
Phison PS5021-E21T controller
Single-sided M.2 2280 fits any laptop or motherboard
Low power consumption typical of four-channel HMB design
1.5 million-hour MTBF rating

- Cons

250 GB capacity too small for most modern game libraries
DRAM-less HMB lags DRAM-equipped peers on random writes
Sustained writes drop sharply after small SLC cache
Capacity-specific writes well below larger UD90 SKUs
No included heatsink in retail box

3.8 / 5 · 19 votes

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Video Review

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Frequently Asked Questions

Only as a boot drive paired with a larger game drive. The 250 GB capacity is too small for a modern game library - most current triple-A games occupy 50-100 GB and a single Call of Duty install can use 200+ GB by itself. The UD90 250 GB will load Windows and launch games faster than any SATA SSD, but the games themselves need to live on a 1 TB or larger secondary drive. For a single-drive 2026 gaming build, jump to the UD90 1 TB or 2 TB, or choose a faster drive at that capacity such as the WD Black SN770 1 TB.

Marginally - the PS5 expansion slot recommends a PCIe 4.0 NVMe drive rated at 5,500 MB/s or higher sequential reads, dimensions within 110 x 25 x 11.25 mm including heatsink, and the M.2 2280 form factor. The UD90 250 GB falls under the recommended bandwidth threshold at around 4,800 MB/s. The PS5 firmware accepts it and games will install, but Sony does not formally recommend it and loading screens will be longer than on a compliant drive. The 250 GB capacity is also too small for serious PS5 use - one or two modern games fill it. For PS5 expansion buy a 1 TB or 2 TB drive that meets Sony's bandwidth target instead.

No, the UD90 is a DRAM-less design that uses Host Memory Buffer (HMB) instead. HMB borrows a small slice of system RAM, typically 64 MB, to hold the logical-to-physical mapping table that a dedicated DRAM cache would otherwise hold. The trade-off is cost: Silicon Power uses the savings to position the UD90 at the cheapest tier of PCIe 4.0 NVMe. The practical penalty is modest on modern Windows or Linux platforms for everyday workloads but more visible on heavy sustained random writes, NTFS metadata churn, and large indexing operations.

Silicon Power rates the 250 GB UD90 at approximately 200 TBW (terabytes written) over the five-year warranty. The TBW scales with capacity across the line; the 1 TB SKU rates 600 TBW and the 2 TB rates 1,200 TBW. At a typical 10-20 GB/day desktop write workload the 250 GB endurance budget lasts roughly 27-55 years, far past the warranty period and the realistic service life of the drive. For write-heavy workloads such as video capture or VM hosting a 250 GB drive is not a sensible target regardless of TBW - the capacity itself is the binding constraint.

Both are budget PCIe 4.0 HMB designs. The Crucial P3 Plus 500 GB rates higher sequential reads at around 5,000 MB/s versus the UD90 250 GB's 4,800 MB/s, and the P3 Plus offers a longer-running SLC cache thanks to its larger capacity. Both ship with five-year warranties and similar HMB-driven random performance. The P3 Plus has Crucial's polished Storage Executive utility for monitoring; Silicon Power's tooling is more basic. For a 250 GB tier the UD90 is the cheaper buy; for 500 GB and up the P3 Plus is the slightly stronger choice on software and brand support.

Usually no even bare. The Phison E21T is a four-channel design with materially lower power consumption than eight-channel flagship controllers, and the 250 GB capacity adds no additional thermal load. Reviewers consistently find the UD90 avoids thermal throttling under typical gaming and application loads even without active cooling. Desktop builds with the motherboard's M.2 heatsink will not see throttling at all. PS5 owners must add a third-party heatsink that fits the 11.25 mm height budget, but as noted the UD90 250 GB is not a sensible PS5 expansion choice on capacity grounds.

Only at very low retail prices and only as a basic boot drive. The 250 GB capacity is the segment's entry-level option and is best skipped for a 500 GB or 1 TB tier that costs only marginally more and delivers materially better sustained write performance plus longer SLC cache windows. If your budget is genuinely fixed at the smallest possible NVMe, the UD90 250 GB does the job; if you have any flexibility, jump up one tier within the same line. For new builds in 2026, single-drive 500 GB or 1 TB tiers are almost always the better value.