Key takeaways
- Maxes out PCIe 4.0 sequential speeds at up to 7,450 MB/s
- Excellent random performance for real-world responsiveness
- Single-sided design fits laptops and the PS5 bay
- Mature firmware and Samsung Magician software support
What's inside
The Samsung SSD 990 PRO 4TB is a PCIe 4.0 M.2 2280 NVMe drive rated for sequential reads up to 7,450 MB/s, sitting at the top of Samsung’s Gen 4 consumer stack. With a full 4TB of capacity in a single-sided module, it targets buyers who want serious space and dependable speed without moving to the newer, pricier PCIe 5.0 generation.
It is a strong fit for gamers with sprawling libraries, content creators juggling large video and photo projects, and PS5 owners who want a proven expansion drive. Anyone chasing the absolute highest sequential numbers should note this is a Gen 4 part, but for the vast majority of real-world tasks it remains more than fast enough.
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Watch: Samsung 990 PRO 4TB Review — Video Review
Design & Build
This is the bare (heatsink-free) version of the 990 PRO, a clean single-sided M.2 2280 board that fits comfortably in laptops, most motherboards and the PS5’s expansion bay where a built-in heatsink would otherwise get in the way. Samsung uses its own controller and V-NAND, and includes a thin nickel coating on the controller plus a heat-spreader label to help manage temperatures. Build quality is what you expect from Samsung’s flagship line: tidy, reliable and well-supported by the Magician software for monitoring and firmware.
Performance
In everyday use the 990 PRO 4TB is quick and consistent. Sequential reads hit the rated 7,450 MB/s ceiling of PCIe 4.0, and random performance is excellent, which is what actually makes game loads, OS responsiveness and file browsing feel snappy. Game load times are effectively instantaneous in DirectStorage-aware titles, and the large capacity means you rarely have to shuffle installs.
Sustained write performance is strong within the SLC cache, though as with any high-capacity TLC drive very large continuous writes will eventually taper once the cache is exhausted. Thermals are well managed for a bare drive, but if you are installing it somewhere with poor airflow, pairing it with a motherboard heatsink or the heatsink model is wise to avoid throttling under heavy sustained loads.
Pros & Cons
- Maxes out PCIe 4.0 sequential speeds at up to 7,450 MB/s
- Excellent random performance for real-world responsiveness
- Single-sided design fits laptops and the PS5 bay
- Mature firmware and Samsung Magician software support
- Gen 4 speeds are outpaced by newer PCIe 5.0 drives
- Bare version can throttle without adequate cooling
- Premium pricing versus value-oriented 4TB rivals
Alternatives to Consider
If you need cooling built in, the Samsung 990 PRO with Heatsink 4TB is the identical drive with a low-profile heatsink attached. Buyers who want to jump to the next generation should weigh the Samsung 9100 PRO 4TB, a PCIe 5.0 drive rated up to 14,800 MB/s, or the WD_Black SN8100 4TB, another fast Gen 5 option. For a more affordable large drive, the Samsung 990 EVO Plus 4TB trades a little peak speed for a lower price.
Frequently Asked Questions
Is the Samsung 990 PRO 4TB compatible with the PS5?
Yes. As a PCIe 4.0 M.2 2280 drive it meets Sony’s requirements, though for the PS5 you should add a heatsink or choose the heatsink version, since the console requires cooling on the drive.
Does the bare version need a heatsink?
For typical desktop use with a motherboard M.2 heatsink it is fine. In cramped or poorly ventilated spots, adding cooling prevents thermal throttling during long sustained writes.
Is PCIe 4.0 still worth buying in 2026?
For most gaming and productivity work, yes. Real-world load times are dominated by random performance, where the 990 PRO excels, so the gap to PCIe 5.0 is smaller than the headline sequential numbers suggest.
What is the difference between the 990 PRO and 990 EVO Plus?
The 990 PRO is the higher-performance flagship with better sustained speeds and endurance, while the 990 EVO Plus is a more affordable mainstream drive with slightly lower peak figures.
Verdict
The Samsung 990 PRO 4TB remains a benchmark for Gen 4 storage in 2026: fast where it counts, spacious, and backed by mature software and a single-sided design that fits almost anywhere. It is not the fastest drive on paper now that PCIe 5.0 exists, but for gamers and creators who value proven reliability and huge capacity at a still-sensible price, it is an easy recommendation, just give it airflow.
