Samsung 990 Pro 4TB — PCIe 4.0 NVMe SSD Review

Name: Samsung 990 Pro 4 TB
Brand: Samsung
SKU: samsung-990-pro-4-tb
Rating: 4.4 (26 reviews)

Posted on May 23, 2026 by Raymond Chen

The Samsung 990 Pro 4 TB takes the company's Pascal controller and V-NAND TLC to the highest consumer capacity in the lineup, delivering 7,450 MB/s reads with endurance to match its footprint.

Samsung 990 Pro 4TB — PCIe 4.0 NVMe SSD Review

Samsung's 990 Pro builds on the 980 Pro's foundation with a new in-house controller — codenamed Pascal — manufactured on an 8 nm process. The eight-channel PCIe 4.0 x4 design draws less power than the 980 Pro's Elpis while delivering higher peak throughput, and the 4 TB variant pairs the controller with Samsung's seventh-generation V-NAND TLC and 4 GB of LPDDR4 DRAM. Samsung also claims a nickel-coated heat spreader on the controller and a copper film on the NAND packages, a subtle thermal design choice that helps the drive sustain peak performance longer without a bulky heatsink. The PCB is single-sided, keeping it compatible with thin laptops and the PS5 expansion bay.

The 4 TB capacity is the ceiling of the 990 Pro consumer stack, sitting above the 1 TB and 2 TB variants. Capacity scaling is relatively flat on this platform: all three capacities share the same 7,450 MB/s sequential read and 6,900 MB/s sequential write ratings, and the 4 TB model carries the highest random IOPS at 1,600,000 read and 1,550,000 write. Endurance scales linearly from 600 TBW on the 1 TB to 2,400 TBW on the 4 TB, maintaining the 600-TBW-per-terabyte ratio Samsung established with the 980 Pro. The 4 TB also includes a heatsink variant (990 Pro with Heatsink) for buyers who want a factory-installed thermal solution.

In the premium PCIe 4.0 segment, the 990 Pro 4 TB faces the WD Black SN850X 4 TB, the SK Hynix Platinum P41 2 TB, and the Solidigm P44 Pro 2 TB — though none of the last two reaches the 4 TB mark at retail. Samsung's key differentiator is software: the Samsung Magician utility provides firmware updates, drive health monitoring, over-provisioning tools, and an optional performance-optimisation mode for content creation workloads. The 990 Pro is also one of the few drives validated for 8K video editing workflows by major NLE vendors, a niche that the 4 TB capacity serves particularly well.

✅ Storage Comparisons:

Top 2 TB SSDs Best PCIe 5.0 SSD Top PCIe 3.0 SSD Drives

🚀 Performance and benchmarks

Samsung rates the 4 TB 990 Pro at 7,450 MB/s sequential reads and 6,900 MB/s sequential writes, both effectively saturating the PCIe 4.0 x4 interface. Random performance peaks at 1,600,000 IOPS read and 1,550,000 IOPS write at queue depth 32, placing the 4 TB variant at the top of the 990 Pro stack — the 1 TB and 2 TB models are rated slightly lower at 1,400K/1,550K and 1,400K/1,550K IOPS respectively.

Performance comparison

Samsung 990 Pro 4 TB 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.

PNY XLR8 CS3140 1 TB: 7,500 MB/s read, 5,650 MB/s write
PNY XLR8 CS3140 2 TB: 7,500 MB/s read, 6,850 MB/s write
Asgard AN4 512 GB: 7,500 MB/s read, 5,500 MB/s write
Asgard AN4 1 TB: 7,500 MB/s read, 5,500 MB/s write
Samsung 990 Pro 4 TB (this drive): 7,450 MB/s read, 6,900 MB/s write

Independent reviewers consistently find the 990 Pro 4 TB delivers real-world sequential throughput within 1–2% of rated figures, and the Pascal controller's improved efficiency means the drive throttles later and recovers faster than the 980 Pro under sustained write loads. Samsung's Intelligent TurboWrite 2.0 provisions a large pseudo-SLC buffer that scales with free capacity: on a near-empty 4 TB drive, the cache can absorb hundreds of gigabytes before transitioning to native TLC write speeds around 1,800–2,000 MB/s. For the content creators and data hoarders who buy a 4 TB drive, this is a meaningful advantage — the buffer is rarely exhausted in workflows that involve intermittent large file transfers rather than sustained dump-and-run operations. Against the SN850X, the 990 Pro generally leads on random I/O consistency while trading blows on peak sequential writes depending on the benchmark and test conditions.

🖥️ Endurance and warranty

Samsung covers the 990 Pro 4 TB with a five-year limited warranty, bounded by a 2,400 TBW endurance rating. At 20 GB/day, that endurance budget spans 328 years — far beyond any realistic service life. The TBW-to-capacity ratio of 600 TBW per terabyte matches the 980 Pro generation and remains competitive with the WD Black SN850X at the same ratio. Samsung's warranty claims are handled directly through the company's RMA portal in most regions, and the brand's retail ubiquity means replacements are typically processed faster than boutique SSD vendors can manage. The 990 Pro also carries a 1.5-million-hour MTBF rating, standard for flagship consumer NVMe drives and consistent with Samsung's in-house controller validation. Users should note that the TBW limit is tracked via the drive's SMART data, and exceeding it voids warranty coverage even within the five-year window.

📊 Specs

Category	Value
Capacity [?]	4 TB
Interface [?]	M.2 4.0 x 4
Controller [?]	Samsung Pascal
Memory type [?]	Samsung 3D TLC
DRAM [?]	LPDDR4
Read speed (MB/s) [?]	7450
Write speed (MB/s) [?]	6900
Read IOPS [?]	1600000
Write IOPS [?]	1550000
Endurance (TBW) [?]	2400
MTBF (million hours) [?]	1500000
Warranty (years) [?]	5

Conclusion

The 4 TB Samsung 990 Pro is the highest-capacity consumer PCIe 4.0 drive from a tier-one manufacturer, and it earns that position by delivering peak Gen4 throughput, class-competitive endurance, and Samsung's mature software ecosystem. It is the right pick for content creators who need a single fast volume for active projects, gamers with multi-terabyte libraries, and professionals whose workflow demands 4 TB of NVMe without the cost and complexity of U.2 or add-in-card enterprise drives. Buyers who can live with 2 TB should compare against the Solidigm P44 Pro and SK Hynix P41 — both offer comparable performance at lower absolute cost, though neither reaches the 4 TB capacity point. For anyone who simply needs the most storage possible on a single consumer M.2 stick without stepping down to QLC, the 990 Pro 4 TB is currently in a class of one.

+ Pros

7,450 MB/s sequential reads — effectively saturating PCIe 4.0 x4
4 TB capacity on a single-sided M.2 2280 — no QLC compromise
Samsung Pascal 8 nm controller with improved power efficiency
2,400 TBW endurance — 600 TBW per terabyte, class-competitive
Samsung Magician software suite with firmware updates and drive tools
Available with factory heatsink option for PS5 and desktop builds
Validated for 8K video editing workflows by major NLE vendors

- Cons

Write IOPS trail some PCIe 5.0 drives in synthetic benchmarks
No 8 TB consumer variant — enterprise PM9A3 required for higher capacities
Price premium over Phison E18-based 4 TB alternatives
Samsung Magician Windows-only for full feature set

🛒 Buy this or similar SSD Storage:

Samsung 980 Pro 2 TB

-57% $165
List Price: $379.99

Buy on Amazon

INLAND Performance Plus 1 TB

$79.99

Buy on Amazon

Silicon Power 512GB NVMe SSD

$42.97

Buy on Amazon

✨ Video Review

Samsung 990 PRO NVMe SSD Review - Versus 22 Other Drives

⁉️ FAQ

The 990 Pro 4 TB is effectively overkill for gaming — and that is exactly why it works well for large game libraries. At 7,450 MB/s, game load times are indistinguishable from any other high-end PCIe 4.0 drive, and DirectStorage-compatible titles benefit from the consistently low latency of Samsung's in-house controller. The real advantage for gaming is the 4 TB capacity: you can store 30–40 modern AAA titles alongside the OS without managing installs. If your gaming library fits within 2 TB, a 2 TB 990 Pro or a less expensive SN850X will deliver the same per-title experience at a lower price. If you want one drive for everything, the 4 TB 990 Pro is a luxury that eliminates storage micromanagement.

Yes, the 990 Pro 4 TB meets all of Sony's PS5 expansion requirements: PCIe 4.0 x4 NVMe M.2 2280, 7,450 MB/s sequential reads (well above the 5,500 MB/s minimum), and a single-sided PCB. The drive is available in both bare and heatsink-equipped versions — the heatsink variant (model MZ-V9P4T0CW) includes a factory-installed aluminium heatsink that fits within the PS5's 110 x 25 x 11.25 mm clearance envelope. For the bare-drive version, you will need to supply your own compatible M.2 heatsink. The 4 TB capacity makes the 990 Pro one of the highest-capacity PS5-compatible SSDs on the market, useful for users with large digital game libraries who want to avoid external USB storage for PS5 titles.

Yes, the 990 Pro includes dedicated DRAM — 4 GB of LPDDR4 on the 4 TB model, with 1 GB and 2 GB on the 1 TB and 2 TB variants respectively. The DRAM holds the flash translation layer mapping tables, enabling the controller to locate data on the NAND without accessing the slower flash array for metadata lookups. This results in lower and more consistent random access latency compared to DRAM-less HMB designs, and it eliminates the small but measurable system RAM overhead that HMB-based drives impose. For multi-terabyte drives especially, a dedicated DRAM cache is important because the FTL table grows with capacity.

The 4 TB Samsung 990 Pro is rated for 2,400 TBW, which translates to roughly 1.3 TB of writes per day over the five-year warranty period. This is a 600-TBW-per-terabyte ratio, consistent with Samsung's premium TLC drives across the 970 EVO Plus, 980 Pro, and 990 Pro generations. At a typical consumer workload of 20–30 GB writes per day, the endurance budget effectively lasts centuries. For content creators writing 100–200 GB per day of video footage, the drive still lasts roughly 33–66 years on paper. The endurance on the 990 Pro is generous enough that Samsung limits the warranty to whichever comes first — five years or 2,400 TBW — and for virtually every consumer, the five years will expire first.

Both drives sit at the top of the PCIe 4.0 consumer segment, and the practical performance gap between them is paper-thin. The 990 Pro 4 TB leads slightly on random read IOPS (1.6M vs 1.2M) and power efficiency thanks to Samsung's 8 nm Pascal controller, while the SN850X 4 TB counters with marginally higher peak sequential writes in some benchmarks and WD's Dashboard software that runs on both Windows and macOS. The SN850X also offers an optional RGB heatsink, a cosmetic differentiator the 990 Pro lacks. In real-world use — gaming, content creation, OS duties — the two are interchangeable. The choice typically comes down to pricing at time of purchase, software preference (Samsung Magician vs WD Dashboard), and which brand's RMA process you trust more.

If you are installing the 990 Pro in a desktop motherboard that already includes an M.2 heatsink, the bare-drive version is sufficient and usually cheaper. Most mid-range and high-end motherboards ship with thermal solutions for at least one M.2 slot. If you are installing in a PS5, a laptop, or a desktop slot without a motherboard heatsink, the factory heatsink version is the simpler option — it is guaranteed to fit the PS5's dimensions and saves you the hassle of sourcing a compatible third-party cooler. The heatsink version typically carries a small price premium, but it eliminates any guesswork about thermal clearance and performance throttling under sustained loads.