SanDisk Optimus 5100

The Optimus 5100 hits 6,600 MB/s read and 5,600 MB/s write, good for the 84th percentile in speed. Its endurance rating is the real flex at the 98th percentile. Just know the 500GB capacity is small and random performance is only average.

Sequential reads at 6,600 MB/s put this drive in the 84th percentile for speed. That's not the absolute best PCIe 4.0 can do, but it's well above average and honestly more than most people will ever notice. The 5,600 MB/s write speed is solid too. Where things get less exciting is random performance, which sits at the 59th percentile. That's middle of the pack. For everyday tasks like booting Windows, launching apps, and loading games, random reads matter more than sequential numbers, and this drive is just okay there.

The QLC NAND is the trade-off. SanDisk's 8th generation BiCS QLC 3D NAND paired with nCache 4.0 helps mask some of the inherent slowness of QLC, but sustained writes to a nearly full drive will drop off. The 500GB capacity also lands in the 24th percentile, which is on the small side for a modern NVMe drive. If you're installing a couple of big games plus your OS, you'll feel that 500GB ceiling fast.

Against the Samsung 990 PRO, the Optimus 5100 loses on raw speed and random performance. The 990 PRO is one of the fastest PCIe 4.0 drives we've tested, and its random read numbers embarrass this SanDisk. But the 990 PRO costs significantly more per gigabyte. The WD_BLACK SN7100 is a closer fight. It's also a budget-friendly PCIe 4.0 drive, and its random performance is better than the Optimus 5100. The Crucial T710 and ADATA GAMMIX S70 Blade both offer higher capacities and better all-around performance, but again, you'll pay for it. The Silicon Power XS70 is probably the most direct competitor on price, and it trades blows with the Optimus 5100 depending on the workload. If endurance is your top priority, the SanDisk's 98th percentile TBW rating beats all of them.

At USD 110 to 120 for the 500GB model, this drive is priced like a budget PCIe 4.0 option, and that's exactly what it is. You're getting 84th percentile speed and 98th percentile endurance for a price that undercuts most premium drives. The CAD 160 listing in Canada tracks similarly. The value proposition is strongest if you need a reliable boot drive or a secondary game drive and don't care about having the fastest random performance on the block. The 5-year warranty sweetens the deal considerably.

The SanDisk Optimus 5100 is a weird one. The 500GB model we're looking at tops out at 6,600 MB/s read and 5,600 MB/s write, which lands it in the 84th percentile for speed in our database. That's genuinely quick for a PCIe 4.0 drive, but it's not the 7,100 MB/s SanDisk slaps on the box. That number is reserved for the 1TB and 2TB models. Still, for most people, 6,600 MB/s is more than enough to make Windows feel snappy and keep game load times short.

The real story here is endurance. This little QLC drive carries a 1,200 TBW rating on the 4TB model, which puts it in the 98th percentile for endurance across all drives we track. That's the kind of longevity rating you'd expect from a much more expensive TLC drive, not a budget QLC stick. The 500GB model won't hit that 1,200 TBW figure, but the fact that the platform supports it says something about how SanDisk built this thing.

If you need more than 500GB, look elsewhere. The capacity ranks in the 24th percentile, and with modern games routinely eating 100GB or more, you'll fill this drive fast. Also skip it if you do heavy sustained write workloads like 4K video editing. The QLC NAND will slow down under sustained writes, and the random performance at the 59th percentile won't keep up with a TLC drive like the WD_BLACK SN7100. And if you want a portable drive, the 15.7 out of 100 portable score tells you everything you need to know. This is an internal drive, full stop.

The SanDisk Optimus 5100 is a solid budget PCIe 4.0 drive with one standout trait: endurance. The 98th percentile TBW rating and 5-year warranty make it a safe long-term bet, and the 84th percentile sequential speed is plenty for most users. The 500GB capacity is the biggest limitation, and the middling random performance means it won't feel as snappy as a premium drive in everyday use. For USD 110 to 120, it's a reasonable buy if you need a reliable drive and don't want to spend Samsung money.