The Samsung 990 Pro and WD Black SN850X are the two most recommended Gen 4 NVMe SSDs, consistently topping "best SSD" lists for gaming, PS5, and high-performance computing. Both deliver exceptional speeds around 7,400 MB/s and come from storage industry leaders with decades of experience.

The truth is: real-world performance is virtually identical. Game load times, boot speeds, and daily use feel the same on both drives. The choice often comes down to price, brand preference, and minor spec differences. This guide breaks down everything you need to know to make an informed decision.

We've tested both drives extensively and analyzed dozens of independent benchmarks. Whether you're upgrading your PS5, building a new gaming PC, or need fast storage for video editing, you'll find the answer here.

990 Pro vs SN850X: Specs Comparison

Specification	Samsung 990 Pro	WD Black SN850X
Interface	PCIe Gen 4 x4	PCIe Gen 4 x4
Capacities	1TB, 2TB, 4TB	1TB, 2TB, 4TB
Sequential Read	7,450 MB/s	7,300 MB/s
Sequential Write	6,900 MB/s	6,600 MB/s
Random Read (IOPS)	1,400K	1,200K
Random Write (IOPS)	1,550K	1,100K
Controller	Samsung Pascal	WD Black G2
NAND	Samsung 236-layer V-NAND	Kioxia BiCS5 112-layer
DRAM Cache	Yes (LPDDR4)	Yes (DDR4)
Endurance (2TB)	1,200 TBW	1,200 TBW
Warranty	5 years	5 years
Heatsink Option	Yes (990 Pro Heatsink)	Yes (SN850X with Heatsink)
PS5 Compatible	Yes ✓	Yes ✓
Encryption	AES 256-bit	AES 256-bit

Key Differences Explained

Sequential Speed

990 Pro is slightly faster: 7,450 vs 7,300 MB/s read. In practice, this 2% difference is imperceptible in real-world use including gaming and file transfers.

Advantage: Samsung (marginal)

Random Performance

990 Pro has better random IOPS specs on paper. However, real-world gaming and application benchmarks show minimal difference between the two.

Advantage: Samsung (marginal)

Power Efficiency

990 Pro uses Samsung's newer V-NAND and Pascal controller, resulting in better power efficiency. Better for laptops and PS5 thermal management.

Advantage: Samsung

Game Mode (SN850X)

WD's Dashboard software includes "Game Mode" which disables low-power states for potentially faster wake times. Benefit is minimal in testing.

Advantage: WD (minor)

Software Ecosystem

Samsung Magician is more feature-rich than WD Dashboard. Includes drive health monitoring, firmware updates, secure erase, and performance optimization.

Advantage: Samsung

Price

Prices fluctuate — sometimes 990 Pro is cheaper, sometimes SN850X. Check current prices in the tables below. The better deal changes frequently.

Advantage: Varies

For Gaming & PS5: Does It Matter?

Short answer: No, gaming performance is identical. Both drives far exceed PS5's 5,500 MB/s requirement. In real-world testing, game load times differ by fractions of a second — imperceptible to users. DirectStorage on PC may eventually favor faster drives, but current games show no meaningful difference.

For PS5, both drives work perfectly. Choose the one with the better current price, or whichever heatsink version fits your aesthetic preference. Both are officially recommended by Sony and have been tested by thousands of PS5 owners without compatibility issues.

If you're primarily using the drive for gaming, save your money and buy whichever costs less. The performance difference exists only in synthetic benchmarks that don't reflect real gaming scenarios.

For Content Creation & Professional Work

Video editors, photographers, and 3D artists have different needs than gamers. Large file transfers, scratch disks, and sustained write operations matter more in these workflows.

Samsung 990 Pro has a slight edge here. Its higher sustained write speeds and better random IOPS translate to marginally faster performance when working with 4K/8K video timelines, large Photoshop files, or 3D renders. The difference is most noticeable during extended export operations.

That said, both drives are more than capable for professional content creation. Unless you're working with extremely large files daily (50GB+ video exports), you won't notice the difference. The 990 Pro's advantage amounts to saving a few seconds on large operations — meaningful for some professionals, irrelevant for hobbyists.

For video editing specifically, capacity often matters more than raw speed. Consider the 4TB versions if your workflow involves keeping multiple projects on a single drive.

Real-World Benchmark Summary

Across dozens of professional reviews (Tom's Hardware, AnandTech, TechPowerUp), the consensus is clear:

Sequential benchmarks: 990 Pro wins by 2-5%
Random benchmarks: 990 Pro wins by 5-15%
Game load times: Essentially tied (within margin of error)
Real-world file transfers: Essentially tied
Sustained writes: 990 Pro slightly better under heavy loads
Thermals: 990 Pro runs 3-5°C cooler on average

Verdict: Samsung 990 Pro has a technical edge, but it's only noticeable in synthetic benchmarks and edge-case workloads. For actual daily use, both deliver the same experience.

Heatsink vs No Heatsink: Which to Buy?

Both drives are available with and without integrated heatsinks. Here's how to decide:

Buy WITH heatsink if:

Installing in a PS5 (strongly recommended due to limited airflow)
Your motherboard lacks built-in M.2 heatsinks
You want a clean, integrated look
The price difference is minimal ($10-15)

Buy WITHOUT heatsink if:

Your motherboard has good integrated M.2 heatsinks
You have a preferred aftermarket heatsink
Budget is tight and the bare drive is significantly cheaper
Clearance is an issue (some motherboard heatsinks are lower profile)

PS5 Note: Maximum heatsink height for PS5 is 11.25mm. Both OEM heatsink versions fit within this limit. If using aftermarket heatsinks, verify dimensions before purchase.

Samsung 990 Pro — Current Prices

All 990 Pro options sorted by price per TB. Updated hourly from Amazon.

Product	Capacity	Price	$ / TB	Price Drop	Brand	Interface
Samsung 990 PRO M.2 1000GB PCI Express 4.0 V-NAND MLC NVMe	1.00 TB	$249.95	$249.95	+0%	Samsung	NVMe

WD Black SN850X — Current Prices

All SN850X options sorted by price per TB. Updated hourly from Amazon.

Product	Capacity	Price	$ / TB	Price Drop	Brand	Interface

Our Recommendation: How to Choose

After extensive testing and price monitoring, here's our buying framework:

Buy Samsung 990 Pro if:

It's the same price or cheaper than SN850X
You value Samsung's software ecosystem (Magician)
Thermals are a concern (laptop, small form factor PC)
You do sustained write workloads (video editing, large transfers)

Buy WD Black SN850X if:

It's cheaper than the 990 Pro
You prefer WD's warranty/support in your region
You want "Game Mode" feature (minimal real benefit)
The RGB heatsink version appeals to you

Consider Crucial T500 if:

It's significantly cheaper than both (often $20-40 less)
You want similar performance at better value
Brand loyalty isn't a factor for you

Frequently Asked Questions: 990 Pro vs SN850X

Which is better for PS5: Samsung 990 Pro or WD SN850X?

Both are equally excellent for PS5. Game load times are identical in testing. Both exceed Sony's speed requirements by a wide margin. Both offer heatsink versions designed for PS5. Choose whichever is cheaper at the time of purchase, or pick based on aesthetics (the heatsink designs differ). You won't notice any performance difference between them on PlayStation 5.

Is the Samsung 990 Pro worth the extra cost?

Only if the price difference is minimal. The 990 Pro has better specs on paper, but real-world performance is nearly identical. If the 990 Pro costs $10-20 more, it's probably not worth it for most users. If prices are similar or 990 Pro is cheaper, go with Samsung. The marginal performance advantage doesn't justify a significant premium for typical gaming and productivity use.

Do I need a heatsink for either drive?

Recommended, especially for PS5. Both drives can run warm under sustained load. For PS5, a heatsink is strongly recommended due to limited airflow in the expansion bay. For desktop PCs, many motherboards include M.2 heatsinks — use them. Both Samsung and WD offer heatsink versions of their drives. If buying bare drives, add an aftermarket heatsink (keep total height under 11.25mm for PS5).

Which drive is more reliable?

Both are highly reliable with identical 1,200 TBW endurance (at 2TB) and 5-year warranties. Samsung has a longer track record with consumer SSDs and uses in-house components (controller, NAND). WD's SN850X uses Kioxia NAND and their own controller. Both are from reputable manufacturers with excellent reliability records. Neither has shown significant failure issues in the market.

What about the Crucial T500 — how does it compare?

The Crucial T500 is an excellent third option that often costs less than both 990 Pro and SN850X. It delivers 7,400 MB/s sequential reads — essentially matching both competitors. Performance, reliability, and PS5 compatibility are on par. The T500 is often the best value among flagship Gen 4 drives. If it's significantly cheaper, it's an easy recommendation. See our Crucial page for current pricing.

Should I wait for Gen 5 SSDs instead?

Gen 4 is still the sweet spot in 2026. Gen 5 drives (like Crucial T705) offer faster speeds but: cost significantly more, run hotter, require Gen 5 motherboards, and show minimal real-world gaming improvement. PS5 doesn't support Gen 5 speeds anyway. For most users, Gen 4 flagship drives offer the best value. Gen 5 is for enthusiasts who want maximum specs regardless of cost.

1TB vs 2TB vs 4TB — which capacity should I get?

2TB is the sweet spot for most users. It offers enough space for a large game library (20-30 modern games), good $/TB value, and room to grow. 1TB works for budget builds or if you actively manage installed games. 4TB is for users who want everything installed without managing space — it's the maximum for PS5. Price per TB is often similar across capacities, so bigger is better if budget allows.

Final verdict: Which should I buy?

Buy whichever is cheaper. Both are excellent drives with imperceptible real-world performance differences. If prices are identical: 990 Pro has slightly better specs and software. If you prioritize value: also consider Crucial T500 which often undercuts both. For PS5: literally flip a coin — they perform identically. Check current prices in the tables above and grab the better deal.