Lexar 4TB SSD PCIe 5.0 NVMe M.2

The Lexar NM990 is a blazing fast 4TB PCIe 5.0 drive with 14,000 MB/s reads and top-tier random performance. It's expensive at USD 763, landing in the 11th percentile for affordability, and the DRAM-less design might raise eyebrows. If you're a professional who needs maximum speed for large file work, it's one of the best options out there. Everyone else should probably save money and grab a fast PCIe 4.0 drive instead.

Let's talk about those numbers, because they're genuinely impressive. The 14,000 MB/s read speed puts this in the 97th percentile for speed, which means it's faster than almost everything else we've tested. To put that in perspective, you could transfer a 100GB video file in roughly 7 seconds, assuming the rest of your system can keep up. The 11,000 MB/s write speed is equally strong, which matters more than most people realize. Lots of drives have fast reads but fall apart on writes, and that's not the case here.

The random performance is where this drive really flexes. 2,000K random read IOPS and 1,500K random write IOPS land it in the 98th percentile for random operations. That's the metric that actually determines how snappy your system feels day to day, loading applications, booting Windows, pulling up game levels. It's the difference between a drive that benchmarks well and one that feels fast in real use. The DRAM-less design is interesting here. Normally that's a red flag for performance, but Lexar has clearly tuned the controller to lean on the PCIe 5.0 bandwidth and host memory buffer instead. It works, clearly, but it's worth knowing that's what's under the hood.

The PCIe 5.0 space is getting crowded, and the NM990 has some serious competition. The Samsung 9100 PRO is the obvious rival, and Samsung's reputation for reliability and their in-house controller give them an edge in brand trust. The Kingston FURY Renegade G5 is another strong contender, often priced a bit more aggressively. And then there's the Western Digital Black SN850X, which is technically PCIe 4.0 but remains one of the best all-around drives on the market at a much friendlier price.

Where the NM990 stands out is raw speed. The 14,000 MB/s read and 2,000K random IOPS put it ahead of most of the pack on paper. But the Crucial T500 and SanDisk WD_BLACK SN8100 both offer compelling alternatives, especially if you're sensitive to price. The SN850X in particular is worth a hard look. It's slower on paper, sure, but in real-world use, most people won't notice the difference between 7,000 MB/s and 14,000 MB/s unless they're doing sustained large file transfers. And you'll save a meaningful chunk of change.

Here's where things get tricky. At USD 763 for the 4TB model, you're paying roughly USD 190 per terabyte. That's a lot. For comparison, you can find excellent PCIe 4.0 drives at half that price per terabyte, and they're still faster than most people will ever need. The affordability percentile of 11th confirms what the price tag suggests. This is a premium product with a premium price, and there's no way around that.

If you're in Canada, the pricing gets even more interesting. The CAD 1,000 to CAD 1,300 spread across two listings is significant. Memory Express has the lower end of that range, so if you're north of the border, that's where you want to shop. A CAD 300 difference is nothing to sneeze at, and there's no reason to pay the higher price for the exact same drive. The value equation here really comes down to whether you're doing work where time is literally money. If you're a professional who moves massive files all day, the speed pays for itself. If you're a gamer or casual user, you're probably better off saving the cash and grabbing a fast PCIe 4.0 drive instead.

The Lexar NM990 is one of those drives that makes you do a double take when you look at the spec sheet. 14,000 MB/s sequential reads and 11,000 MB/s writes put it right at the top of the PCIe 5.0 food chain, and the 4TB capacity means you're not making the usual speed-versus-space compromise. Lexar has been quietly putting out solid storage for years, but this feels like them stepping into the ring with the heavy hitters and throwing a serious punch.

Who is this for? Honestly, it's for people who know they need speed and aren't afraid to pay for it. Video editors working with 8K footage, 3D artists juggling massive project files, or gamers who want the absolute fastest load times on the planet. The laptop score of 82.7 out of 100 is the strongest use case here, which makes sense given the M.2 2280 form factor and the fact that PCIe 5.0 laptops are finally becoming a real thing.

But here's the catch that jumps out immediately. The affordability ranking is 11th percentile, which is our polite way of saying this drive is expensive. Really expensive. At USD 763 in the US and CAD 1,000 to CAD 1,300 in Canada, you're paying a serious premium for that top-tier performance. Whether that's worth it depends entirely on whether you actually need 14 GB/s or just want it.

If you're building a gaming PC on a reasonable budget, skip this. The gaming score of 80.6 is fine, but you're paying a massive premium for speed that won't meaningfully improve your frame rates or load times compared to a good PCIe 4.0 drive. Put that money toward a better GPU or more RAM instead. The WD Black SN850X or Crucial T500 will serve you just as well in real-world gaming scenarios at a fraction of the cost.

Also skip this if you need portable storage. The portable use case score of 21.6 out of 100 is rough, and that makes sense. This is an internal M.2 drive, not something you're going to toss in a bag and carry around. If you need fast external storage, look at a Thunderbolt or USB4 external SSD instead. And if you're on a tight budget, this drive's 11th percentile affordability ranking should be all the warning you need. There are plenty of excellent drives at half the price that will handle everyday tasks without breaking a sweat.

If you're a professional video editor, 3D artist, or anyone who regularly moves hundreds of gigabytes around and needs it done yesterday, the Lexar NM990 is one of the best options available right now. The speed is undeniable, the capacity is generous, and the endurance rating of 3,000 TBW means it should last through years of heavy use. The laptop use case score of 82.7 is the highest of the bunch, so if you've got a PCIe 5.0 laptop, this is a fantastic upgrade.

For gamers and general users, the recommendation is a bit softer. The gaming score of 80.6 is solid, but you're paying a huge premium for performance that won't translate into a meaningfully better experience in most games. Load times will be fast, sure, but a good PCIe 4.0 drive will get you 95% of the way there for half the price. If money is no object and you want the best, go for it. If you're building a sensible gaming rig, put the savings toward a better GPU instead.