1TB SSD NVMe M.2

The Optimus 5100 hits 7,100 MB/s read and 1,300K random write IOPS, putting it in the 96th percentile for random performance. The 1,200 TBW endurance rating is best-in-class for a QLC drive. Just know that sustained writes will slow down once the cache fills, and the feature set is bare bones.

The sequential numbers are the headline here: 7,100 MB/s read and 6,700 MB/s write. That's fast enough to make a 990 PRO sweat, and it lands this drive in the 87th percentile for speed overall. Random performance is even more impressive at 1,000K read IOPS and 1,300K write IOPS, which puts it at the 96th percentile. That's the kind of responsiveness you feel when launching apps or scrubbing through a timeline.

The QLC NAND is the trade-off. Once the SLC cache fills up during a long sustained write, speeds will drop. SanDisk doesn't publish the cache size, but QLC drives typically fall to somewhere between 800 and 1,500 MB/s when the cache is exhausted. For a 1TB drive, that's usually after 100-200GB of continuous writes. If you're copying a 4K feature film project, you'll feel it. If you're doing normal creator work, you probably won't.

Against the Samsung 990 PRO, the Optimus 5100 actually matches or beats it on paper: 7,100 MB/s read vs 7,450 MB/s for the 990 PRO, but the Optimus wins on random write IOPS at 1,300K vs 1,100K. The 990 PRO uses TLC NAND though, so it holds sustained speeds better. The Crucial T500 is a closer fight, with similar sequential numbers and TLC NAND, but it typically costs more. The Kingston Fury Renegade and Lexar NM1090 PRO are both TLC drives that will beat the Optimus on sustained writes, but they're priced higher too. For bursty creator workloads, the Optimus punches way above its price class. For sustained data hoarding, any TLC drive in this list will outlast it.

Pricing is all over the place depending on where you shop. In the US, you'll see it listed between $174 and $200, a $26 spread across just two listings. The $174 price is the one to hunt for. In Europe, the gap is even wider at €190 to €219 across four listings, so a €29 swing. The €190 price is the sweet spot. At the low end of those ranges, you're getting near-flagship performance for a solid chunk less than a 990 PRO or T500. At the high end, you're paying premium money for a QLC drive, and that math gets harder to justify.

The SanDisk Optimus 5100 hits 7,100 MB/s read and 6,700 MB/s write on PCIe 4.0, which puts it in the top tier of drives we've tracked. That's backed by a 1,200 TBW endurance rating and a 5-year warranty, so SanDisk clearly expects this thing to last. The 1TB model sits at a 96th percentile for random performance and 95th for endurance in our database, which is a pretty wild combo for a QLC drive.

But here's the catch: it's QLC NAND. That's how SanDisk keeps the price down while hitting those headline speeds. The nCache 4.0 tech does a lot of heavy lifting to mask the inherent slowness of QLC once the cache fills up. For most creator workflows, you'll never notice. For sustained massive transfers, you might.

If you regularly move massive files, like raw 4K footage dumps or multi-hundred-gigabyte archives, the QLC NAND will bite you. Once the cache fills, write speeds drop hard. You'd be better off with a TLC drive like the Crucial T500 or Kingston Fury Renegade. Also skip this if you need hardware encryption or other advanced features, the feature set here is a 15th percentile showing. And if you're looking for a portable drive, the 18.4/100 portable score tells you everything you need to know.

The SanDisk Optimus 5100 is a weirdly compelling drive. You're getting 96th percentile random performance and 95th percentile endurance at a price that undercuts every TLC competitor in this tier. The QLC NAND is the asterisk, but for most creators doing app launches, photo editing, and video scrubbing, the cache rarely fills up. If you can find it at the low end of the price range, it's a no-brainer. If you're paying top dollar, you're better off with a TLC drive.