SanDisk BLACK SN850X 4TB M.2 2280 PCIe Gen4 x4 SSD With Heatsink

The SanDisk WDS400T2XHE-00BCA0 is a 4TB NVMe solid state drive that occupies an M.2 2280 slot and uses a PCIe Gen4 x4 connection to push data at up to 7,300 MB per second for reads and 6,600 MB per second for writes. An integrated heatsink keeps temperatures in check, so performance remains stable during extended gaming sessions, large project renders, and long file transfers.

The drive relies on 3D TLC NAND, giving it a blend of high capacity, low latency, and reliable endurance. Random performance reaches 1.2 million read IOPS and 1.1 million write IOPS, which means game levels load quickly, 4K footage scrubs smoothly, and multitasking feels responsive even under heavy workloads. Firmware features such as predictive loading, overhead balancing, and adaptive thermal management continuously fine-tune operations to prevent slowdowns.

Installation is simple: insert the module into a compatible PCIe Gen4 M.2 slot, secure it with a single screw, and power on. On Windows, the WD_BLACK Dashboard unlocks Game Mode 2.0, letting you monitor temperatures, update firmware, and prioritize gaming traffic with just a few clicks.

With a write endurance rating of 2,400 TBW and a five-year limited warranty, the SN850X is built for users who expect daily updates, frequent downloads, and constant content creation. It suits performance-focused desktops, small-form-factor builds that need cable-free storage, and any system where consistent speed matters as much as capacity.

• Sequential read speed up to 7,300 MB/s and sequential write speed up to 6,600 MB/s
• Random performance rated at 1.2 million read IOPS and 1.1 million write IOPS
• Integrated heatsink helps maintain speed under heavy load
• PCIe Gen4 x4 interface on an M.2 2280 module installs without cables
• Uses 3D TLC NAND to deliver 4TB capacity with low latency
• Game Mode 2.0 and WD_BLACK Dashboard for Windows tunable performance
• Rated for 2,400 TBW endurance and backed by a five-year limited warranty