Best 400GB PCIe 3.0 DRAM SSDs
There are 4 400GB PCIe 3.0 DRAM SSDs compared here. The fastest is the Synology SNV3400 at 3100 MB/s read at 400GB, and the highest-rated for endurance is the Corsair NEUTRON NX500 (2793 TBW). Sequential reads across the group span 2200–3100 MB/s at 400GB.
Why this configuration
A 400GB PCIe 3.0 DRAM SSD is an affordable NVMe step up from SATA. Gen3 is roughly six times SATA's throughput yet often costs little more, making it the easy default for a first NVMe drive or a laptop that only supports Gen3.
Usually chosen for: budget builders, laptop upgraders and anyone leaving SATA behind.
Good fit: workstation and creative loads that hammer random I/O.
Ranked list
Speeds on this page are the manufacturer's 400GB ratings where published (4 of 4 drives), not the family headline figure. 2 of the 4 are rated slower at 400GB than at their fastest capacity. Rated writes at 400GB run 550–1600 MB/s.
| # | Model | Tier | Controller | Read MB/s (at 400GB) | TBW | |
|---|---|---|---|---|---|---|
| 1 |  Intel SSD 750 400GB, 800GB, 1.2TB | High-end | Intel CH29AE41AB0 | 2200 | 127.75 | Find on Amazon |
| 2 |  Synology SNV3400 400GB | Mid-range | Phison PS5012-E12DC | 3100 | 500 | Find on Amazon |
| 3 |  Synology SNV3500 400GB | Mid-range | Phison PS5012-E12DC | 3100 | 500 | Find on Amazon |
| 4 |  Corsair NEUTRON NX500 400GB, 800GB, 1.6TB | Mid-range | Phison PS5007-E7 | 2800 | 2793 | Find on Amazon |
The parts, explained
PCIe 3.0 x4 reaches about 3,500 MB/s — plenty for everyday use and gaming, and cheaper than Gen4.
An onboard DRAM cache keeps the flash mapping table on the drive, holding random performance steady under sustained load.