SIX 11 2TB PCIe 5.0 x4 NVMe M.2 2280

The SIX X15000 is a 2TB PCIe 5.0 SSD that hits 14,356 MB/s read speeds, putting it in the top 2% of all drives we've tested. It's DRAM-less but uses SLC caching and a 6nm controller to stay fast and cool at 73°C with the included heatsink. At $370 USD, it's pricey but undercuts Samsung's Gen5 offerings while matching their speed. Buy it if you want bleeding-edge performance and can live with a newer brand's unproven long-term track record.

Let's talk numbers. 14,356 MB/s sequential read and 13,662 MB/s write put this drive in the 98th percentile for speed. That means it's faster than 98% of every drive we've tested. You'll move a 4K movie in seconds, and game load screens basically disappear. The 2,000K random read and write IOPS are equally impressive, also 98th percentile. That's what makes everyday tasks feel snappy, not just big file transfers.

The 6nm controller is doing a lot of heavy lifting here. Smaller manufacturing process means less heat and better power efficiency. SIX claims 1.7x better power efficiency than Gen4 rivals, and the passive heatsink keeps things at 73°C under load. That's solid for a Gen5 drive, which are notorious for running hot. The DRAM-less design is the one spec that gives me pause. SLC caching masks it well in most scenarios, but if you're writing hundreds of gigabytes in one go, you might see speeds dip once the cache fills up. For most people, that's a non-issue. For video editors working with 8K footage all day, it's worth knowing.

The Western Digital SN850X is the most obvious alternative. It's a Gen4 drive, so its sequential speeds top out around 7,300 MB/s, roughly half what the X15000 delivers. But it has DRAM, a proven track record, and WD's firmware support is excellent. If you're building a system that won't fully utilize Gen5 bandwidth, the SN850X is a safer, often cheaper choice. The Samsung 9100 PRO is the direct Gen5 competitor, and it brings Samsung's reputation and software ecosystem to the table. The X15000 beats it on raw sequential numbers in some tests, but Samsung's endurance and support are hard to argue with.

The Kingston FURY Renegade G5 and Crucial T500 are also worth a look. The Kingston is another Gen5 option with similar specs but more brand recognition. The Crucial T500 is Gen4, but it's often significantly cheaper and still plenty fast for most people. The X15000's main advantage is that it delivers Gen5 performance at a price that undercuts Samsung while matching or beating the speed of everything else in its class. The trade-off is brand trust and long-term support, which matters more for a drive you'll likely keep for years.

At $370 USD for 2TB, this drive is not cheap. It lands in the 22nd percentile for affordability, which means most drives in our database cost less. But you're paying for top-tier performance, and the value proposition depends entirely on whether you actually need Gen5 speeds. If you're coming from a SATA SSD or even a Gen3 NVMe drive, the jump is massive. If you already have a fast Gen4 drive, the real-world difference in gaming and everyday use is smaller than the spec sheet suggests.

Compared to the Samsung 9100 PRO or Western Digital SN850X, the X15000 holds its own on raw speed while often undercutting the big names on price per gigabyte. The 5-year warranty helps ease concerns about buying from a lesser-known brand. Just know that you're paying a premium for being on the bleeding edge, and that premium doesn't always translate to a noticeable difference in daily use.

The SIX X15000 is one of those drives that makes you do a double take. A 2TB PCIe 5.0 NVMe SSD with 14,356 MB/s read and 13,662 MB/s write speeds, and it's not from one of the usual suspects. SIX has been in the semiconductor game for 17 years, but most people haven't heard of them. That's about to change if this drive keeps showing up in benchmark charts.

This thing sits in the 98th percentile for both sequential speed and random performance in our database. That's not just fast, that's top of the charts territory. It's aimed squarely at gamers who want zero load times and content creators who move massive files around all day. The included heatsink means you can drop it into a desktop build without worrying about thermal throttling.

But here's the thing. It's DRAM-less. For a drive this fast, that's an interesting choice. SIX leans on SLC dynamic caching and a 6nm controller to make up for it, and the numbers suggest it works. Still, DRAM-less drives sometimes stumble under sustained heavy writes, and that's worth keeping in mind if you're planning to hammer this thing with constant large transfers.

If you're running a PCIe 4.0 or older system, skip this drive. You'll pay a Gen5 premium and never see the speeds you're paying for. A solid Gen4 drive like the Crucial T500 or WD SN850X will feel just as fast in real-world use and cost significantly less. Laptop users should also look elsewhere. The portable score of 20.4/100 in our database reflects the fact that this drive runs hot and draws more power than most laptops can comfortably handle, even with the heatsink removed.

If you're the type who keeps a drive for five-plus years and wants guaranteed firmware updates and proven endurance, stick with Samsung or WD. The X15000's endurance sits at the 57th percentile, which is average, and the lack of a firmware download page is a legitimate concern for long-term ownership. This drive is for desktop enthusiasts who want maximum speed today and are comfortable being early adopters with a newer brand.

If you're building a new high-end gaming rig or a workstation for 8K video editing, the X15000 is a compelling pick. The speed is real, the thermals are handled, and the included heatsink means one less thing to buy. Gamers will love the instant load times, and content creators will appreciate moving massive files without coffee breaks. The 5-year warranty provides some peace of mind for a newer brand.

But if you're upgrading an existing system that doesn't have PCIe 5.0 support, or if you mostly play games that don't benefit from Gen5 speeds, save your money. A good Gen4 drive like the SN850X or Crucial T500 will feel nearly identical in daily use and cost less. The X15000 is for people who want the absolute fastest thing available and are willing to take a small gamble on a lesser-known name to get it.