Buying guide
Internal SSD Buying Guide (2026)
How to choose an internal SSD: NVMe or SATA, Gen3 or Gen4, capacity, DRAM, endurance, and the cloning steps that make upgrading painless.
Start with the slot, not the speed
Check what your machine actually accepts before comparing speeds. A free M.2 slot that supports NVMe means an NVMe drive, a 2.5 inch bay means SATA, and some M.2 slots accept SATA drives only. The manual or a parts guide for the exact model settles it, and guessing risks buying a drive that cannot fit or cannot reach its speed.
Decision framework: buy this type if, avoid if
Buy a flagship Gen4 NVMe if you game heavily, edit video, or move large files daily and your machine has a Gen4 slot. Avoid flagships if your use is web and office, where a value NVMe feels the same. Buy a value NVMe if you want a clear upgrade for little money. Buy SATA if your machine has no free M.2 slot, or as a second drive. Avoid SATA if an M.2 NVMe slot sits empty, since NVMe is far faster for similar money.
NVMe, SATA, Gen3, and Gen4 in plain language
SATA is the older storage connection, capped near 560 MB/s, and it uses a 2.5 inch drive with cables. NVMe runs over PCIe through an M.2 slot, with Gen3 reaching around 3,500 MB/s and Gen4 reaching around 7,000 MB/s and beyond. A Gen4 drive in a Gen3 slot runs at Gen3 speeds, and a Gen5 drive in a Gen4 slot runs at Gen4 speeds, so matching the drive to the slot matters more than buying the fastest drive on sale.
DRAM, NAND, and endurance without jargon
A DRAM cache is a small fast memory chip that helps the drive track where data lives, which keeps performance steady when the drive fills or writes go on for a long time. Drives without DRAM use host memory instead, which works well for everyday use but slows sooner under heavy writes. NAND type matters too: TLC generally outlasts QLC and holds speed better, while QLC offers more capacity per money. Endurance, measured in TBW, tells how much can be written over the drive's life, and everyday users rarely approach it, while heavy video writers should check it carefully.
Cloning, installing, and keeping the new drive healthy
Clone the old drive before swapping, using the maker's software and a USB adapter where needed, and keep the old drive untouched until the new one boots cleanly. Install the drive firmly in its slot or bay, with a heatsink where the build or console requires one, and update firmware through the maker's software. Leave some free space on the drive, since a nearly full SSD slows down, and check health occasionally through the maker's dashboard rather than waiting for trouble.
Questions, answered
How much should I spend on an SSD upgrade?
Enough to match the slot and the use: a value NVMe for everyday use, a flagship Gen4 for gaming and heavy work, and a SATA drive only where NVMe does not fit. Below value NVMe level, drives exist, but they often cut endurance and sustained speed, which is a poor saving for a drive expected to last years.
Will an SSD make my old computer fast again?
For storage-bound slowness, yes, dramatically: booting, opening apps, and loading files all improve at once. An SSD cannot fix a slow processor or too little memory, so a machine that struggles with many apps open may also need a memory upgrade alongside storage.
Can I add an SSD without removing my old drive?
Often, yes, if a spare M.2 slot or drive bay exists. Adding a second drive for games or media while keeping the old drive for the system is a popular route, and it avoids cloning entirely.