Details

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Western Digital (WD) Black SN850X
 is a high-performance PCIe Gen4 x4 NVMe solid-state drive (SSD) designed for gaming and intensive use. The model without a heatsink is suitable for desktop PCs with motherboard-integrated heatsinks or laptops with adequate cooling. An 8TB capacity model was released, but it was generally noted as a high-capacity niche option.

Product specifications
Specifications vary slightly between the 1TB and higher capacity models. The 8TB model uses different flash memory and has slightly lower sequential performance ratings than the 2TB and 4TB variants. 

Feature	1TB	2TB / 4TB	8TB
Sequential Read	Up to 7,300 MB/s	Up to 7,300 MB/s	Up to 7,300 MB/s
Sequential Write	Up to 6,300 MB/s	Up to 6,600 MB/s	Up to 6,600 MB/s
Random Read	Up to 800K IOPS	Up to 1.2M IOPS	Up to 1.2M IOPS
Random Write	Up to 1.1M IOPS	Up to 1.1M IOPS	Up to 1.1M IOPS
Endurance (TBW)	600	1,200 (2TB), 2,400 (4TB)	2,400 (4TB)
NAND Type	112-layer TLC	112-layer TLC	BiCS6 flash
Form Factor	M.2 2280	M.2 2280	M.2 2280
Interface	PCIe Gen4 x4	PCIe Gen4 x4	PCIe Gen4 x4

Key features

• Targeted for gaming: The drive is marketed with features like Game Mode 2.0 software for Windows users, which is designed to improve responsiveness and reduce load times, though some reviews note the effect may be negligible in real-world use.
• High performance: The 
  SN850X
   is a top-tier PCIe 4.0 SSD that delivers excellent read and write speeds, significantly faster than its predecessor, the SN850.
• Cache: It features a DRAM cache for improved performance during heavy workloads, which distinguishes it from DRAM-less models like the WD Black SN7100.
• Optional heatsink: The 
  SN850X
   is available in versions with and without a heatsink. The heatsink model is required for optimal performance when used with a Sony PlayStation 5 and is recommended for desktop PCs without sufficient cooling.