Western Digital WD_BLACK SN850X 4TB
4TB · M.2 2280 · PCIe 4.0 x4
Specifications
Yes
DRAM cache
7300 MB/s
Sequential read
6600 MB/s
Sequential write
2400 TBW
Endurance
Family guide
WD_BLACK NVMe SSDs| SN770 | SN850X This model | SN850P | SN7100 | SN8100 | |
|---|---|---|---|---|---|
| Released | 2022 | 2022 | 2023 | 2024 | 2025 |
| Interface | Not available | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 5.0 x4 |
| Read | Not available | 7300 MB/s | 7300 MB/s | 7000 MB/s | 14900 MB/s |
| Write | Not available | 6600 MB/s | 6600 MB/s | 6700 MB/s | 14000 MB/s |
| Endurance | Not available | 2400 TBW | 2400 TBW | 2400 TBW | 2400 TBW |
| Summary | DRAM-less: it borrows system memory (HMB) instead, which the PS5 doesn't support, so console speeds may fall short. | WD_BLACK's flagship PCIe 4.0 drive, with a DRAM cache that the SN770 and SN7100 lack. | Same drive as the SN850X, sold only with a heatsink and licensed for the PS5. | DRAM-less successor to the SN770, with newer TLC flash and better power efficiency. | Has a DRAM cache and draws little power for its speed, but can still run hot without a heatsink. |
Capacity grid
| 250GB | 500GB | 1TB | 2TB | 4TB | 8TB | |
|---|---|---|---|---|---|---|
| SN770 | Out of stock | Out of stock | $399.95 | $655.72 | Not available | Not available |
| SN850X | Not available | Not available | $344.01 | $599.81 | $1,289.95 This model | $3,633.64 |
| SN850P | Not available | Not available | $379 | $749.95 | $1,000 | Out of stock |
| SN7100 | Not available | $271.55 | $299 | $485.40 | $1,290.48 | Not available |
| SN8100 | Not available | Not available | $433.28 | $799 | $1,299 | Out of stock |
How it compares
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Price history
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Listings
Listings sorted by Price, ascending.
Western Digital WD BLACK SN850X 4TB PCIe Gen4 M.2 NVMe SSD WDBB9G0040BNC Ebay AU $1,289.95 WD_Black SN850X NVMe SSD with Heatsink 4 TB Internal SSD (Gaming Memory, PCIe Gen4 Technology, Read 7.3 MB/s, Write 6600 MB/s) Black Amazon AU $1,362.17 Western Digital WD Black M.2 SSD Built-in Heatsink 4TB PS5 Operation Verified NVMe PCIe Gen4 x4 WDS400T2XHE-EC SN850X Out of stock Amazon AU — WD_Black SN850X 4TB NVMe PCIe 4.0 x4 M.2 Internal Gaming SSD with Heatsink Out of stock Amazon AU — Western Digital 4TB SN850X M.2 2280 Gaming SSD Built-in NVMe PCIe Gen4x4 Read Up to 7300MB/s Write Up to 6600MB/s WDBB9G0040BNC [Parallel Import] Out of stock Amazon AU —