SanDisk Optimus GX PRO 850X

The SanDisk Optimus GX PRO 850X packs 8TB into a single M.2 2280 stick with 1.2M random IOPS and 4800 TBW endurance. It's a workstation dream drive at $1,700 USD, but that price is hard to justify for pure gaming. The capacity is the headline feature, and nothing else in the consumer space really matches it. If you need 8TB in one slot, this is one of very few options, and it's a good one.

Sequential reads top out at 7300 MB/s and writes at 6600 MB/s on the 2TB and 4TB models. The 8TB version we're looking at here is rated slightly lower on reads at 7200 MB/s, though writes stay at 6600 MB/s. Either way, we're talking about PCIe 4.0 territory that's near the ceiling of what the interface can do. That puts this drive in the top tier of our speed rankings, around the 86th percentile. For real-world use, that means loading a 100GB game or copying a massive video project happens about as fast as the rest of your system will allow.

The random performance is where this drive really flexes. 1.2 million random read IOPS and 1.2 million random write IOPS on the 8TB model. That's best-in-class territory, landing in the 95th percentile of everything we've tested. For a workstation drive, this matters more than sequential speeds. Scrubbing through a timeline, opening hundreds of small files, running databases, all of that benefits from high random IOPS. The nCache 4.0 tech helps here too, acting as a fast buffer for writes. DirectStorage support is there for future games, though honestly the random performance is already so high that most games won't be able to tell the difference.

The Samsung 990 PRO is the obvious comparison point. It's faster in some benchmarks, has a stronger reputation, and costs way less per gigabyte. But it tops out at 4TB. If you need 8TB, you're either buying two 990 PROs and dealing with RAID or you're looking at this SanDisk. The WD Black SN850X is in a similar boat, excellent drive, great gaming performance, but 4TB max. Both of those are better pure gaming drives if you don't need the capacity.

The Micron T710 and Seagate FireCuda 530R are interesting alternatives. The FireCuda 530R has a reputation for endurance and reliability, and it's available in larger capacities. The Micron T710 is more of an enterprise-leaning drive that sometimes shows up in consumer channels. Neither matches the SanDisk's combination of 8TB capacity and 1.2M IOPS random performance. The Kingston Fury Renegade 4TB is a solid budget alternative if you can live with half the capacity. Honestly, the SanDisk's real competition is itself. There just aren't many 8TB M.2 drives out there, and the ones that exist are all expensive.

Let's talk about the elephant in the room. This drive costs $1,700 USD. That's a lot of money for a PCIe 4.0 drive in a world where PCIe 5.0 drives are starting to show up. But you're not paying for speed here, you're paying for density. 8TB on a single stick is rare, and the only other drives that offer this kind of capacity in M.2 2280 form factor are either enterprise models or similarly expensive consumer options.

Is it worth it? For most people, no. If you're a gamer with a 2TB drive that's getting full, you can buy a 4TB SN850X or 990 PRO for a fraction of this price and call it a day. But if you're a video editor working with 8K footage, or someone running a home lab with multiple VMs, or a photographer with a Lightroom catalog that's out of control, the math changes. The cost per gigabyte is actually reasonable for what you're getting, and the endurance rating means you won't be replacing this drive anytime soon. It's a niche product with a niche price, and that's fine.

The SanDisk Optimus GX PRO 850X is one of those drives that makes you stop and stare at the spec sheet for a second. 8TB on a single M.2 2280 stick. That's the kind of capacity that used to require a stack of hard drives or a very expensive enterprise SSD. Now it fits under your motherboard's heatsink. SanDisk is clearly aiming this at people who are tired of juggling multiple drives, whether that's a game library that's ballooned past 4TB or a video editing workflow with raw footage piling up.

Who's this actually for? Workstation users, mostly. Our scoring puts it at 80.8 for workstation use, which is the strongest category here. Gaming comes in a bit lower at 78.3, and that makes sense. Most games don't need 8TB, and the sequential speeds, while excellent, aren't the headline feature for gaming. The headline is capacity. If you're editing 4K or 8K footage, running virtual machines, or just want every single game you own installed at once, this drive solves a real problem.

The interesting wrinkle is the endurance rating. 4800 TBW is a serious number, and it's backed by TCG Opal v2.01 hardware encryption. That's not something you see on every consumer drive. SanDisk is positioning this as a creator's drive that can handle constant writes without falling over. The question is whether the price justifies the package, and we'll get into that below.

If you're a gamer looking for faster load times, skip this. The gaming score of 78.3 tells the story. A 2TB or 4TB Samsung 990 PRO or WD Black SN850X will give you essentially identical real-world gaming performance for a fraction of the cost. You're paying for capacity here, not speed, and most game libraries don't need 8TB.

Also skip this if you're planning to use it in an external enclosure. The portable score of 20.6 is one of the lowest we've seen in that category. The drive runs hot under sustained load, and most USB enclosures won't provide adequate cooling. If you need portable storage, look at a purpose-built external SSD or a lower-power drive that's designed for enclosure use. This is an internal drive for a desktop workstation, and it's best treated that way.

For workstation users who need maximum capacity in a single slot, this is one of the best options available right now. The 8TB capacity combined with 1.2M random IOPS and 4800 TBW endurance makes it a legitimate workhorse. Video editors, 3D artists, and anyone dealing with massive datasets will appreciate not having to split projects across multiple drives. The hardware encryption is a nice bonus for anyone handling sensitive client work.

For gamers, it's harder to recommend. The gaming score of 78.3 reflects the fact that most games simply don't benefit from 8TB of storage or 1.2M IOPS. You'd be paying a huge premium for capacity you probably won't use. A 4TB SN850X or 990 PRO will give you 95% of the real-world gaming experience for less than half the price. Buy this drive because you need the space, not because you want faster load times.