Western Digital WD_BLACK SN850 500GB PCIe 4.0 x4 NVMe M.2 2280

The SN850 hits 7000 MB/s reads and 810K random read IOPS, putting it in the 90th percentile for random performance. But 500GB for 350 USD is a rough value proposition in the 27th percentile for affordability. Fast drive, wrong price, too little storage.

The SN850's sequential read speed of 7000 MB/s is right at the ceiling of what PCIe 4.0 can do, and our benchmarks back that up. Random read IOPS hit 810K, which lands in the 90th percentile, meaning this drive is one of the best on the market for the small, scattered file operations that dominate game loading and OS boot times. The 680K random write IOPS is no slouch either.

Write speeds tell a slightly different story. The 500GB model is rated for 4100 MB/s sequential writes, which is noticeably behind the 5300 MB/s the 1TB version claims. That's the capacity tax in action, fewer NAND packages means less parallelism for writes. Still, for a gaming-focused drive, reads matter more than writes, and the SN850's read performance is top-tier. The DRAM cache and TLC NAND keep things consistent under load, and the heatsink model does its job keeping thermals in check during long sessions.

Against the Samsung 9100 PRO, the SN850 holds its own on reads but gets smoked on capacity options and endurance. The Kingston FURY Renegade G5 and Crucial T500 both offer 1TB and 2TB variants that deliver similar or better real-world gaming performance at a lower cost per gigabyte. The Seagate FireCuda 530R is another strong alternative with better endurance ratings. Where the SN850 still wins is brand recognition and that pre-installed heatsink, which saves you a few bucks and some install hassle. But spec-for-spec, the 500GB SN850 is fighting a losing battle against newer drives that simply offer more storage for the same money.

Here's where things get uncomfortable. At 350 USD for 500GB, you're paying about 70 cents per gigabyte. That's a rough deal when the SN850's own 1TB sibling and competitors like the Crucial T500 offer far better price-per-gigabyte ratios. The 27th percentile affordability ranking isn't a fluke, it's the market telling you this specific SKU is overpriced. The included heatsink adds some value if you're on PS5 or a motherboard without M.2 cooling, but it doesn't justify the premium. If you can find this on sale for under 250 USD, it starts making sense. At full price, you're paying early-adopter tax on a drive that's no longer the new hotness.

The WD_BLACK SN850's headline numbers are still respectable in 2025: 7000 MB/s sequential reads and 810K random read IOPS put it in the 94th percentile for features and 90th for random performance in our database. That's a drive that loads games fast, plain and simple. The 500GB capacity is the real constraint here, landing in the 26th percentile, which means you'll be doing the storage shuffle sooner than you'd like.

At 350 USD for half a terabyte, this thing sits in the 27th percentile for affordability. That's a tough pill when newer PCIe 4.0 drives with double the capacity are circling the same price point. But if you're slotting this into a PS5 or a gaming rig and you want that WD_BLACK brand with a pre-installed heatsink, the SN850 still delivers where it counts.

If you're building a new system or upgrading from a SATA SSD, skip this specific 500GB SKU. The 26th percentile capacity ranking means you'll be uninstalling games to make room within months, and the 27th percentile affordability score means you're paying a premium for the privilege. The 300 TBW endurance rating is fine but not exceptional, so heavy content creators who write terabytes of data regularly should look at drives with higher endurance. And if you don't need the heatsink, you can get the bare SN850 or a competitor's drive for less money.

The WD_BLACK SN850 is still a fast drive, no question. 7000 MB/s reads and 90th percentile random performance mean it'll chew through game loads and OS boots without breaking a sweat. But the 500GB capacity at 350 USD is a hard sell in 2025. Unless you specifically need the heatsink model for a PS5 and you're getting it at a discount, you're better off spending the same money on a 1TB or 2TB drive from Crucial, Kingston, or even WD's own newer SKUs. The SN850 was a pioneer, but pioneers don't stay on top forever.