SanDisk Optimus GX PRO 850P 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
SanDisk Optimus SSDs| GX PRO 850X | GX PRO 850P This model | GX 7100 | GX PRO 8100 | 5100 | |
|---|---|---|---|---|---|
| Released | 2026 | 2026 | 2026 | 2026 | 2026 |
| Interface | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | Not available | Not available |
| Read | 7300 MB/s | 7300 MB/s | 7000 MB/s | Not available | Not available |
| Write | 6600 MB/s | 6600 MB/s | 6700 MB/s | Not available | Not available |
| Endurance | 2400 TBW | 2400 TBW | 2400 TBW | Not available | Not available |
| Summary | Same hardware as the WD_BLACK SN850X, with older TLC flash than the GX 7100 and GX PRO 8100; a heatsink version fits the PS5. | Same hardware as the WD_BLACK SN850P: a GX PRO 850X sold only with a heatsink and licensed for the PS5. | Same hardware as the WD_BLACK SN7100; DRAM-less, unlike the GX PRO models, and built for low power use in laptops and handhelds. | Same hardware as the WD_BLACK SN8100; draws little power for its speed but can still run hot without a heatsink. | Same hardware as the WD Blue SN5100, with QLC flash, unlike the GX models, so writes slow sharply once the cache fills. |
Capacity grid
| 500GB | 1TB | 2TB | 4TB | 8TB | |
|---|---|---|---|---|---|
| GX PRO 850X | Not available | $269.99 | $479.99 | $649.99 | Not available |
| GX PRO 850P | Not available | $309.99 | $609.99 | Out of stock This model | $2,249.99 |
| GX 7100 | $94.99 | $229.99 | $449.99 | $869.99 | Not available |
| GX PRO 8100 | Not available | $269.99 | Not available | Not available | Not available |
| 5100 | $109.99 | $194.46 | $245.99 | Not available | Not available |
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