SanDisk SSD

The WD_BLACK WDS400T1X0M is a 4TB PCIe 5.0 monster with 14,900 MB/s reads and top-tier random performance. It's expensive and already replaced by a newer model, but if you need maximum throughput for heavy workloads, it delivers. Shop around, US prices swing by USD 147.

This drive is stupid fast. 14,900 MB/s read and 11,000 MB/s write put it near the top of the charts, and the 2,300K random IOPS are best-in-class territory. The TLC NAND keeps things consistent under load, and the included heatsink helps tame the heat these Gen5 drives pump out. The DRAM-less design is the one eyebrow-raiser, but SanDisk's controller clearly knows what it's doing because the numbers don't suffer. For gaming, it's overkill in the best way. For content creation and AI workloads, it's a legitimate time-saver.

Against the Samsung 9100 PRO, this WD_BLACK trades blows on raw speed but gives up some polish and brand trust. The Crucial T705 is another Gen5 speed demon that's often cheaper, though its endurance numbers don't always match up. The Western Digital Black SN850X and Seagate FireCuda 530R are Gen4 drives, so they're not really in the same speed class, but they're significantly cheaper and still plenty fast for most people. The Kingston Fury Renegade is a solid Gen4 value pick if you don't need bleeding-edge performance. If you're chasing maximum throughput, this drive is near the top. If you're chasing value, Gen4 is still the smarter buy for most users.

Pricing is all over the place right now. US listings range from USD 859 to USD 1,006, which is a USD 147 spread. That's a big enough gap that you should shop around before pulling the trigger. The lower end of that range feels fair for a 4TB Gen5 drive with this kind of speed, but at the top end you're paying early-adopter tax on a product that's already been superseded. If you can snag it near USD 859, it's a solid deal. At USD 1,006, you're better off looking at the newer Optimus GX PRO 8100 or waiting for a price drop.

The SanDisk WD_BLACK WDS400T1X0M is a 4TB PCIe 5.0 drive that basically laughs at your old Gen4 SSD. We're talking 14,900 MB/s sequential reads and 11,000 MB/s writes, which puts it in the 96th percentile for speed in our database. It's built for people who move massive files around all day, whether that's 8K video, huge game installs, or AI model training.

But here's the thing. It's DRAM-less, which sounds scary, but the numbers don't lie. Random performance hits 2,300K IOPS, landing in the 98th percentile. The endurance is solid at 2,400 TBW, and it comes with a heatsink, which you'll absolutely want because Gen5 drives run hot. Just know this is a last-gen model now, SanDisk already replaced it with the Optimus GX PRO 8100.

Skip this if you're a casual gamer or everyday user. A good Gen4 drive like the SN850X or FireCuda 530R will feel just as snappy for half the price. Also skip it if your motherboard doesn't have a PCIe 5.0 M.2 slot, because you'll be paying for speed you can't use. And if you're the type who wants the latest and greatest, SanDisk already has a newer model out, so this one's technically last-gen.

Buy this if you're building a high-end workstation or gaming rig and you actually move large files regularly. Video editors, 3D artists, and AI tinkerers will feel the difference immediately. Casual gamers and everyday users won't notice the jump from a good Gen4 drive, so save your money. The 4TB capacity is generous, the speed is elite, and the included heatsink is a nice touch. Just make sure your motherboard has a PCIe 5.0 M.2 slot, or you'll be leaving a lot of performance on the table.