The SanDisk Optimus GX PRO 850P is a PS5 and PS5 Pro expansion SSD. A review of its 2TB version, published September 26, 2026, praised performance and cooling but criticized the drive’s price and power efficiency. The model is offered in capacities from 1TB to 8TB, and its rated specifications vary by capacity.
The GX PRO 850P’s strengths and trade-offs
The 2TB review described the drive as capable and cool-running, while identifying its high price and power efficiency as drawbacks. Those judgments are qualitative; the available specifications give rated speeds, not benchmark scores.
That makes the 850P a plausible fit if you want an SSD marketed specifically for PlayStation consoles and value a heatsink-equipped design. The price snapshots, however, make capacity an important part of the decision: the 2TB model was listed at almost twice the review-time price of the 1TB version.
SanDisk’s PS5 and PS5 Pro compatibility
SanDisk says the GX PRO 850P is officially licensed and tested for PlayStation 5 and PlayStation 5 Pro. The company describes the heatsink as designed for the consoles’ M.2 slots and promotes the drive as offering up to 8TB of added storage. Games can be stored and played from the expansion SSD.
The drive uses the M.2 2280 form factor, PCIe 4.0 x4, and NVMe 1.4. SanDisk also lists compatibility with M.2 M-key computers that accept M.2 2280 drives.
Rated specifications by capacity
The sequential read and write figures are rated maximums. Endurance is listed in terabytes written (TBW), the total amount of data the drive is rated to write over its service life.
| Capacity | Sequential read rating | Sequential write rating | Endurance rating | Heatsink-inclusive height |
| 1TB | 7,300 MB/s | 6,300 MB/s | 600 TBW | 9.89 mm |
| 2TB | 7,300 MB/s | 6,600 MB/s | 1,200 TBW | 9.89 mm |
| 4TB | 7,300 MB/s | 6,600 MB/s | 2,400 TBW | 10.31 mm |
| 8TB | 7,200 MB/s | 6,600 MB/s | 4,800 TBW | 10.31 mm |
Each capacity has a five-year limited warranty. The reported 2TB review sample had 1GB of DDR4 DRAM; that observation applies to the sample, not automatically to every capacity.
US price snapshots and the WD Black comparison
Review-time US prices on September 26, 2026, put the 850P above the corresponding WD Black SN850P prices for the 1TB, 2TB, and 4TB models.
| Capacity | SanDisk Optimus GX PRO 850P | WD Black SN850P |
| 1TB | $309.99 | $234.99 |
| 2TB | $609.99 | $494.99 |
| 4TB | $1,139.99 | $1,019.00 |
The review also listed the 8TB GX PRO 850P at $2,249.99. SanDisk’s US 8TB listing showed that amount as an offer price and $3,699.99 as the actual price on September 26, 2026.
The review describes the GX PRO 850P as closely related to the WD Black SN850P and traces its design lineage to the WD Black SN850X. The lower review-time SN850P prices offer a concrete point of comparison, while the GX PRO’s SanDisk-stated console licensing and testing apply specifically to PlayStation 5 and PlayStation 5 Pro.
