Key takeaways
- Class-leading PCIe 4.0 performance with excellent random speeds and low latency
- Large 4TB capacity in a single-sided 2280 stick that fits laptops and tight slots
- Mature, reliable controller with strong Magician software for monitoring and firmware
- Comfortably exceeds PS5 storage requirements when paired with a heatsink
What's inside
The Samsung 990 PRO 4TB is the high-capacity version of one of the most respected PCIe 4.0 NVMe drives on the market. It pairs Samsung’s in-house controller and V-NAND with a 2280 M.2 form factor, rated for sequential reads up to 7,450 MB/s and writes up to 6,900 MB/s, and it targets anyone who wants both serious speed and a lot of room in a single drive.
This drive is aimed at gamers with sprawling libraries, video editors juggling large project files, and creators who need a big, fast scratch or working disk. The 4TB capacity is the whole point, giving you generous storage without dropping to a slower QLC drive. If you only need a boot drive or a modest game library, a smaller 990 PRO or a cheaper drive makes more sense.
As an Amazon Associate we earn from qualifying purchases.
⚡ Save on Your Next PC — Amazon Prime
Prime members get fast free shipping on the systems above, plus early access to Prime Day & Black Friday PC deals. New members get a 30-day free trial.
Watch: Samsung 990 PRO 4TB Review — Video Review
Design & Build
The 990 PRO 4TB is a single-sided M.2 2280 stick, which helps it fit slim laptops and the tight M.2 slots found under motherboard heatsinks. This bare version omits a heatsink, relying on your motherboard’s thermal pad or built-in cooler to keep it in check; Samsung also sells a heatsink model for cases without integrated cooling. The nickel-coated controller and a thin heat-spreader label help with thermal management, and Samsung’s Magician software handles firmware, health monitoring and its optional encryption features.
Performance
In everyday use the 990 PRO 4TB behaves like a top-tier Gen4 drive: near-instant game loads, snappy file transfers and strong sustained throughput for large sequential jobs like video exports. Its random performance and low latency are where it earns its reputation, keeping the system responsive under mixed workloads better than many rivals. As a PS5 expansion drive it comfortably exceeds Sony’s minimum requirement, though you will need to add a heatsink for that role.
It is important to be realistic about the ceiling: this is still a PCIe 4.0 drive, so its peak sequential speeds trail the newer PCIe 5.0 generation that can approach 14,000 MB/s. For gaming that gap is largely invisible, but for the heaviest sequential creator workloads a Gen5 drive will finish faster. Like all high-capacity NVMe, sustained writes that exhaust the cache will slow down, though the large 4TB pool makes that rare in typical use.
Pros & Cons
- Class-leading PCIe 4.0 performance with excellent random speeds and low latency
- Large 4TB capacity in a single-sided 2280 stick that fits laptops and tight slots
- Mature, reliable controller with strong Magician software for monitoring and firmware
- Comfortably exceeds PS5 storage requirements when paired with a heatsink
- Peak sequential speeds now trail newer PCIe 5.0 drives
- This bare version ships without a heatsink, so it needs motherboard or console cooling
- 4TB commands a high price per drive compared with smaller capacities
Alternatives to Consider
If your board or console lacks cooling, the Samsung 990 PRO with Heatsink 4TB solves that out of the box, while the Samsung 990 EVO Plus 4TB trades a little peak performance for a lower price. Buyers who want the fastest possible sequential throughput and have a Gen5 slot should look at the Samsung 9100 PRO 4TB or the WD_Black SN8100 4TB, both PCIe 5.0 drives that push well beyond what Gen4 can reach.
Frequently Asked Questions
Does the 990 PRO 4TB need a heatsink?
The bare model relies on your motherboard’s M.2 cooling, which is fine for most desktops. For a PS5 or a case without an M.2 heatsink, add one or buy the heatsink version to avoid thermal throttling.
Is it fast enough for a PS5?
Yes. Its speeds comfortably exceed Sony’s requirement for PS5 storage expansion, so games load quickly; just be sure to install it with a heatsink in the console.
Should I buy this or a PCIe 5.0 drive?
For gaming the difference is negligible and the 990 PRO is often better value. For the heaviest sequential creator work, a Gen5 drive like the 9100 PRO will finish large transfers faster.
Is 4TB worth it over 2TB?
If you keep a large game library or big media projects, the extra space avoids constant shuffling. If your needs are modest, the 2TB model offers the same speed for less money.
Verdict
The Samsung 990 PRO 4TB remains one of the best high-capacity PCIe 4.0 SSDs you can buy, blending top-tier real-world speed, ample storage and Samsung’s dependable software into a single-sided drive that fits almost anywhere. Its main caveats are the Gen4 speed ceiling and the missing heatsink on this version. For gamers and creators who value capacity and consistency over chasing peak Gen5 numbers, it is an excellent, safe choice.
