Western Digital WD_BLACK SN850X

The WD Black SN850X is one of the fastest PCIe 4.0 drives we've tested, with random performance in the 95th percentile. It's a great value at the low end of its price range, but shop around because prices vary by USD 105 in the US. If you need speed and endurance without breaking the bank, this is the one to get.

The numbers here are legit. 7,300 MB/s sequential read and 6,600 MB/s write put it near the top of the PCIe 4.0 class. Random performance is where it really shines though, landing in the 95th percentile in our database. That means snappy load times, fast boot, and no stutter when you're jumping between apps. The 1,200K random read IOPS and 1,100K random write IOPS back that up. Endurance is solid too at 1,200 TBW, which is well above average for a 2TB drive. The one thing to watch: it's DRAM-less, which is unusual for a drive this fast. WD's controller and firmware clearly pick up the slack, but it's worth knowing.

Against the Samsung 9100 Pro, the SN850X holds its own on speed but gives up some features and brand recognition. The Crucial T710 is a newer drive with similar specs, but the SN850X has a longer track record and better endurance numbers. The Kingston Fury Renegade is a solid budget alternative, but it doesn't match the SN850X on random performance. The Seagate FireCuda 530R is another strong competitor, but it's often pricier. If you want the best balance of speed, endurance, and price, the SN850X is hard to beat. If you need the absolute latest features or the biggest brand name, Samsung might edge it out.

Pricing is all over the place right now. In the US, you're looking at USD 325 to USD 430 depending on the vendor. That's a USD 105 spread, which is wild. Shop around. In Canada, it's CAD 490 to CAD 578, so an CAD 88 gap. The drive itself is worth it at the low end of those ranges. At the high end, you're paying too much. Wait for a sale or find the cheapest listing. For what you get, this is one of the better value drives in the high-performance PCIe 4.0 space.

The WD Black SN850X is one of those drives that just works. It's fast, it's reliable, and it's priced well enough that you don't feel like you're getting fleeced. We've seen it top charts in our database for random performance, and owners seem genuinely happy with it. That's rare.

It's not perfect. The feature set is pretty middle of the pack, and social proof is thin compared to bigger names. But for raw speed and endurance, this thing is a monster. If you're building a gaming rig or a workstation that needs to chew through big files, this should be on your shortlist.

If you're on a tight budget or you don't need bleeding-edge speed, skip this. A mid-range PCIe 3.0 or budget PCIe 4.0 drive will save you money and you probably won't notice the difference in everyday use. Also skip it if you need a 4TB drive for a thin laptop, since the double-sided design might not fit. And if you're the type who never updates firmware, maybe look elsewhere, because a few owners hit issues that needed a patch.

If you're building a gaming PC or a workstation and you want a drive that just screams, buy this. It's fast, it lasts, and it's priced right when you find a deal. The 2TB version is single-sided, so it'll fit in most laptops too. Just make sure you update the firmware when you get it, and maybe grab the heatsink version if you're going to hammer it with sustained writes.