SanDisk 4TB SSD PCIe 4.0 x4 NVMe M.2 2280

The Optimus 4TB hits 7,100 MB/s read and 1,100K random write IOPS, which is 94th percentile territory. But it's DRAM-less QLC at a $600 USD price point, and the feature set is nearly bare. Fast in bursts, questionable at full price.

The headline numbers are legit. 7,100 MB/s sequential read and 6,700 MB/s write put this drive well above average for PCIe 4.0, and the random performance is even more impressive. 1,100K random write IOPS is a standout, sitting in the 94th percentile across all drives we track. That's the kind of number that makes application launches and file copies feel snappy, even when you're throwing a lot of small files at it.

The QLC NAND and DRAM-less design are the trade-offs. SanDisk's nCache 4.0 tech helps mask the lack of DRAM by using a portion of the NAND as an SLC cache, but once that cache fills up during large sustained writes, you'll see speeds drop. For typical creator workloads, like editing 4K video or moving large project folders, you'll mostly stay in the fast zone. Just don't expect it to hold 6,700 MB/s forever if you're dumping a terabyte of footage at once.

Stacked against the Samsung 9100 PRO, the Optimus gives up a lot. Samsung's drive has DRAM and typically better sustained write performance, though you'll pay more for it. The Kingston FURY Renegade G5 is another strong competitor with similar PCIe 4.0 speeds but a more robust controller setup. The Crucial T500 often undercuts the Optimus on price while delivering comparable real-world performance. And the WD_BLACK SN850X, which shares SanDisk's parent company, offers better endurance and a more proven track record. The Optimus wins on raw random write IOPS in some scenarios, but it's hard to recommend over these alternatives when the price is this close.

At $600 USD, this drive is asking flagship money for a mid-tier design. The affordability percentile of 13th tells the story: you're paying a premium for the SanDisk name and the 4TB capacity, but you're not getting DRAM or TLC NAND. In Europe, prices range from 634 to 676 EUR, and Canadian buyers are looking at 840 to 855 CAD. For that kind of cash, you can often find drives with better sustained performance and more features. The value proposition hinges entirely on whether you need 4TB of fast storage right now and don't want to wait for a sale.

The SanDisk Optimus 4TB hits 7,100 MB/s read and 6,700 MB/s write, which puts it in the 87th percentile for speed in our database. That's a serious number for a QLC drive, and it's backed by 900K random read IOPS and 1,100K random write IOPS. For a 4TB M.2 2280, this thing moves data like it has something to prove.

But here's the catch. It's DRAM-less, it's QLC, and it's priced at $600 USD in the US. The endurance rating of 1,200 TBW is solid for the capacity, landing in the 76th percentile, but the feature set is bare bones at the 15th percentile. SanDisk is pitching this at creators who want big capacity and fast sequential speeds without paying for a flagship. Whether that math works depends on how much you care about sustained writes and long-term consistency.

If you're doing heavy sustained writes, like regularly dumping hundreds of gigabytes of footage at once, skip this drive. The DRAM-less QLC design will slow down once the SLC cache fills, and the 15th percentile feature set means you're not getting extras like hardware encryption or advanced thermal management. At $600 USD, you can find drives with DRAM and TLC NAND that will hold up better under sustained load. The portable use case score of 19.6 out of 100 also makes this a poor choice for external enclosure use.

The SanDisk Optimus 4TB is a fast drive with a frustrating set of compromises. The sequential speeds and random write performance are genuinely impressive, and the 1,200 TBW endurance is reassuring. But the DRAM-less QLC design and the $600 USD price tag make it a tough sell when competitors offer more for similar money. If you find it on sale for significantly less, it's worth considering. At full price, you're paying a premium for the SanDisk logo and not much else.