Samsung 990 Pro 1TB Gen4 M.2 SSD

Hard Drive

Samsung 990 Pro 1TB Gen4 M.2 SSD Main Picture

Background on Solid State Drives

Solid-state drives (SSDs) store data electrically, rather than on magnetic disks like traditional hard drives (HDDs). This means there is virtually no delay when seeking a specific bit of data, and there is no physical limitation to how fast reading and writing of data can happen. Instead, the limits come down to the controller inside the drive, the speed at which the individual flash memory chips can transfer information, and the connection between the drive and the rest of the computer.

These drives are available in many physical forms: 2.5-inch (similar in size to laptop HDDs), PCI-Express (which slot into a system like a graphics card), and M.2 "sticks". The more traditionally shaped drives usually connect to motherboards via SATA, just like hard drives do, and that connection itself tends to be the limiting factor in their performance. M.2 drives can use either SATA or the much faster PCI-Express connection, depending on the drive itself and the motherboard it is installed in. There are also U.2 drives, which are close in size to the 2.5-inch models but use a much faster data connection; they are found more often in servers and datacenters than in desktop workstations.

Samsung's 990 Pro line of solid-state drives is their fifth generation of consumer M.2 SSDs, and the second to support PCI-Express generation 4.0. This interface allows for greatly increased transfer speeds, potentially double that of PCIe Gen 3. This specific 1TB model has sequential read speeds of up to 7.4GB/s and write speeds up to 6.9GB/s.

Please note that not all CPUs and platforms support PCI-E 4.0 yet, and on some motherboards the M.2 slots may not have the full x4 lanes this SSD is capable of utilizing. In either of those cases, performance will be limited by the speed of the slot. These drives can also get hot during extended read / write operations - moving hundreds of gigabytes at a time. That is an extreme scenario, which many users may never run into, but if the drive does get too hot it will throttle down to prevent overheating. That will reduce drive performance until it cools off, but even in that situation its speed is still well above what SATA-based SSDs offer.

Model: Samsung MZ-V9P1T0B/AM


Capacity 1000 GB
Interface PCIe 4.0 x4
Cache Size 1024 MB
Form Factor M.2 2280
Endurance (TBW) 600 TBW
Peak Power Draw 7.8 Watts
Chip Layout Single Sided
Net Weight 0.09 kg (0.2 lbs)
Sequential Read 7,450 MB/s
Sequential Write 6,900 MB/s
Random 4KB Read 1,200,000 IOPS
Random 4KB Write 1,550,000 IOPS