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Silicon Power 4TB UD90 NVMe 4.0 Gen4 PCIe M.2 SSD R/W up to 5,000/4,500 MB/s (SP04KGBP44UD9005)
SP Silicon Power

Silicon Power 4TB UD90 NVMe 4.0 Gen4 PCIe M.2 SSD R/W up to 5,000/4,500 MB/s (SP04KGBP44UD9005)

Bottom line: The Silicon Power 4TB UD90 NVMe 4.0 Gen4 PCIe M.2 SSD R/W up to 5: 4TB in a single M.2 slot, no drive juggling; main trade-off: 5,000 MB/s trails 7,000+ MB/s Gen4 flagships.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For SSDs and PC storage upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ 4TB in a single M.2 slot, no drive juggling
  • ✓ Rated 5,000/4,500 MB/s read/write on PCIe 4.0
  • ✓ SLC caching lifts sequential and random speeds
  • ✓ LDPC coding plus end-to-end data protection

Cons

  • ✗ 5,000 MB/s trails 7,000+ MB/s Gen4 flagships
  • ✗ 1,200 TBW cap voids warranty if exceeded
  • ✗ No DRAM cache listed in the specs
  • ✗ No heatsink included for hot M.2 slots

Manufacturer description

The Silicon Power UD90 4TB is a PCIe 4.0 NVMe M.2 SSD built for people who need bulk capacity without paying flagship prices. Rated read speeds reach 5,000 MB/s and writes 4,500 MB/s, roughly double the bandwidth of the PCIe 3.0 generation it replaces, so game installs, 4K project files, and large model checkpoints move off your drive faster than they would on an older Gen3 stick. Silicon Power leans on SLC caching to lift both sequential and random throughput, and pairs it with LDPC error correction so the drive keeps data intact as cells age. RAID support and built-in end-to-end data…

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SpecPicks Verdict

SpecPicks scored Silicon Power 4TB UD90 NVMe 4.0 Gen4 PCIe M.2 SSD R/W up to 5 using a rating × review-volume × price-fit model applied to published specs and reviews across the ssds & storage category. SP Silicon Power's ssds & storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for ssds & storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How fast is the Silicon Power UD90 4TB?

It is rated up to 5,000 MB/s sequential read and 4,500 MB/s sequential write over PCIe 4.0, roughly double the bandwidth of a PCIe 3.0 drive.

Will the UD90 work in a PCIe 3.0 motherboard?

It fits any standard M.2 NVMe slot and runs at PCIe 3.0 speeds there. You need a PCIe 4.0 slot to reach the full rated 5,000/4,500 MB/s.

What warranty does the UD90 come with?

A 5-year limited warranty or 1,200 TBW of total writes, whichever comes first. Exceeding the rated TBW limit voids coverage.

Does the UD90 include a heatsink?

No heatsink is listed in the product details. Check the listing for the exact variant, and plan on your motherboard's M.2 heatsink for sustained heavy writes.

Is the UD90 4TB good for gaming and creative work?

Yes. SLC caching improves both sequential and random performance for large game installs and 4K project files, which makes it a solid pick for both gaming and creative work.

Key Features

  • To bolster its multi-tasking factor even further, the UD90 takes advantage of increased bandwidth when used in conjunction with motherboards equipped with PCIe 4.0 slots. In fact, it has nearly double the bandwidth of PCIe 3.0 for shorter download times and the ability to download more files within the same amount of time.
  • An SSD's speed is meaningless without the ability to handle that speed reliably. The UD90 achieves improved sequential read/write and random read/write performance with support for SLC Caching. At the same time, it supports low density parity check (LDPC) coding to ensure accuracy of data transmission and reliability of data access.
  • The UD90 supports RAID to protect data in the case of a drive failure. It's also equipped with built-in E2E data protection for enhanced data transfer integrity. Unexpected things can happen at any moment, but the UD90 is prepared for them with your data at its utmost priority.
  • Backed by a 5-year limited warranty or up to 1200 TBW, whichever comes first. Please note that the warranty covers standard consumer/business use and is voided if the drive’s total written data exceeds its rated TBW limit.

Full Specifications

BrandSP Silicon Power
Color4TB
Model NameSP04KGBP44UD9005
Read Speed5000 megabytes_per_second
Unit Count1 Count
Form FactorM2
Media Speed4500 megabits_per_second
Model NumberSP04KGBP44UD9005AY
Built-In Mediasolid state drive
Hard-Drive Size4 TB
Mfr Part NumberSP04KGBP44UD9005AY
Number of Items1
Special FeatureBackward Compatible
Installation TypeInternal Hard Drive
Compatible DevicesLaptop
Data Transfer Rate5000 megabytes_per_second
Enclosure MaterialSilicone
Additional FeaturesBackward Compatible
Hard Disk InterfaceRaid
Warranty Description5-year limited warranty

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Silicon Power 4TB UD90 NVMe 4.0 Gen4 PCIe M.2 SSD R/W up to 5,000/4,500 MB/s (SP04KGBP44UD9005) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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Silicon Power 4TB UD90 NVMe 4.0 Gen4 PCIe M.2 SSD R/W up to 5,000/4,500 MB/s (SP04KGBP44UD9005)
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