SanDisk 8TB SSD NVMe

The SanDisk Optimus GX PRO 850X packs 8TB into a single M.2 2280 stick with top-tier random performance and PCIe 4.0 speeds that hit 7300 MB/s. It's priced at $1,700 in the US, which puts it in the bottom 3% for affordability. Customer ratings are concerning at 3.6 out of 5, though the sample size is small. If you need maximum capacity in one slot, this is your drive. If you don't, buy something cheaper.

Let's talk about what those numbers actually mean when you're sitting in front of your machine. The 7300 MB/s read speed is right at the ceiling of what PCIe 4.0 can do. You're not leaving much on the table versus a PCIe 5.0 drive in real-world sequential workloads, and you're doing it with a drive that holds 8TB. The 6600 MB/s write speed is also strong, though not quite as close to the interface limit. For large file transfers, video renders, or moving around massive project folders, this drive will chew through them without breaking a sweat.

The random performance is where this drive really separates itself. 1200K random read and write IOPS puts it in the top 4% of everything we track. That means when you're opening a project with thousands of small files, booting into a heavy OS, or running a database that hammers the drive with tiny operations, the Optimus GX PRO stays responsive. A lot of high-capacity drives sacrifice random performance to hit capacity targets. This one doesn't. The endurance rating of 4800 TBW is solid for a TLC drive, though not class-leading. It works out to roughly 0.33 drive writes per day over a 5-year warranty period, which is fine for a workstation drive but not the kind of number that makes you think this is built for write-heavy server duty.

The most obvious competitor is the Western Digital Black SN850X. WD owns SanDisk, so there's some shared DNA here, but the SN850X has been a darling of the PCIe 4.0 generation for years. It's fast, reliable, and widely available. The catch is that the SN850X tops out at 4TB in most markets, so if you need 8TB in one slot, the Optimus GX PRO has no direct competition from its own corporate sibling. The Samsung 9100 PRO is another name to watch. Samsung drives tend to have stronger brand trust and better customer ratings, and the 9100 PRO is a PCIe 5.0 drive that pushes sequential speeds higher. But again, capacity is the differentiator. Samsung's high-capacity options don't hit 8TB on a single M.2 stick in most configurations.

The Kingston FURY Renegade G5 and Crucial T700 are both PCIe 5.0 drives that will outrun the Optimus GX PRO on sequential benchmarks. The T700 in particular posts numbers that make 7300 MB/s look pedestrian. But PCIe 5.0 drives run hot, often need beefy heatsinks, and draw more power. The Optimus GX PRO stays within PCIe 4.0's thermal envelope, which matters in tight builds. The Seagate FireCuda 530R is another PCIe 4.0 option with a strong reputation, but it also caps out below 8TB. So the real story here is that the Optimus GX PRO isn't competing on raw speed or price. It's competing on being the only drive in its class that combines this capacity with this level of random performance in a standard M.2 2280 form factor.

Value is where this drive gets complicated. At $1,700 in the US, you're paying roughly $212 per terabyte. That's a lot. For comparison, you can often find 4TB PCIe 4.0 drives from competitors for significantly less per terabyte, and you'd just buy two of them. But you'd also need two M.2 slots, and not everyone has a spare. The Optimus GX PRO is selling density as a feature, and for some builds, that's genuinely worth the premium. If you're in a small form factor case with one M.2 slot, or a laptop that only takes a single drive, 8TB on one stick is the only way to get this much storage without external enclosures.

European pricing is even rougher. The EUR listings range from 2,115 to 2,204, which is a meaningful jump over the US price even accounting for VAT differences. Canadian buyers are looking at 2,495 CAD, and Brazilian pricing at 19,914 BRL is in a whole different universe. The affordability percentile in our database is 3rd, which means 97% of drives are cheaper. That's not a typo. This is a halo product, and SanDisk is pricing it like one. Whether it's worth it depends entirely on whether you actually need 8TB in a single M.2 slot, because if you don't, there are much better ways to spend this money.

The SanDisk Optimus GX PRO 850X is one of those drives that makes you do a double take. 8TB on a single M.2 2280 stick. That's the kind of capacity that used to require a 3.5-inch drive or a stack of smaller SSDs, and now it's sitting on a stick the size of a stick of gum. If you're editing 8K footage, running massive datasets, or just hate the idea of ever uninstalling a game again, this thing is aimed squarely at you.

SanDisk isn't exactly a newcomer to storage, but this drive feels like them flexing. The spec sheet is aggressive: 7300 MB/s sequential reads, 6600 MB/s writes, and 1200K IOPS on both random read and write. Those random numbers are the kind of thing that separates a drive that feels snappy under load from one that just posts big sequential numbers for the marketing slide. Our database puts the random performance in the top 4% of all drives we track, which is genuinely rare territory.

But here's the thing. This drive is expensive. Really expensive. The US listing sits at $1,700, and European buyers are looking at over 2,100 EUR. For that money, you're not just buying storage, you're buying density and a specific kind of peace of mind. Whether that peace of mind holds up is something we'll get into, because the customer feedback on this one is, well, mixed at best.

If you're a gamer, skip this. The gaming score of 77.8 out of 100 isn't bad, but you're paying workstation prices for capacity you'll never fill. A 2TB SN850X or Samsung 990 PRO will load games just as fast and cost a fraction of the price. Put the savings toward a better GPU or a bigger monitor. Same goes for anyone thinking about using this in an external enclosure. The portable score of 20.2 out of 100 is one of the weakest we've seen, and the price makes it a terrible choice for on-the-go storage. Buy a portable SSD or a cheaper internal drive with an enclosure instead.

Also skip this if you're building a NAS or server with multiple drive bays. The endurance rating of 4800 TBW is fine for a workstation, but server workloads with constant writes will chew through that faster than you'd like. And the price per terabyte is brutal when you're buying multiple drives. Look at enterprise drives or even high-capacity SATA SSDs for that kind of setup. The Optimus GX PRO is a specialist's tool, and if you're not the specialist it was built for, you're overpaying.

If you're a video editor, data scientist, or anyone who needs 8TB of fast NVMe storage in a single M.2 slot, the Optimus GX PRO is basically your only option, and it's a good one. The random performance is exceptional, the sequential speeds are right at the PCIe 4.0 limit, and the endurance rating is adequate for workstation use. You'll pay a serious premium for the privilege, but if your workflow demands this much storage in this form factor, the drive delivers.

For everyone else, this is a harder sell. Gamers don't need 8TB of NVMe storage at this price, and the gaming score of 77.8 out of 100 reflects that. You'd be better off with a 2TB or 4TB drive from WD, Samsung, or Crucial and spending the savings on a better GPU. The portable use case score of 20.2 out of 100 tells you everything you need to know about using this in an external enclosure. It's not built for that, and the price makes it a terrible choice for portable storage anyway. This is a workstation drive through and through, and it should be judged on those terms.