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The short answer
Check three things before buying: the form factor and length, almost always M.2 2280 but sometimes 2242 or 2230, whether the slot is NVMe or the older SATA type, and the PCIe generation your laptop supports. A Gen 5 drive in a Gen 3 laptop runs at Gen 3 speeds and costs more for nothing.
A drive upgrade is the last genuinely transformative upgrade available on most laptops, because memory is increasingly soldered and processors always were. It is also the easiest to get wrong, since the connector that physically fits may not be the interface the laptop actually supports.
Work out what fits
Find your exact model number
Not the marketing name. The service tag or product number is on the underside. Use it to find the service manual, which most manufacturers publish free.
Check the form factor and length
M.2 2280 means 22mm wide and 80mm long, and it is the most common. Compact laptops sometimes use 2242 or 2230, which are shorter. A 2280 drive will not fit a 2230 slot.
Check the interface
M.2 slots can be NVMe, SATA, or both. They look similar and are not interchangeable. The service manual or a tool such as CrystalDiskInfo on the current drive will tell you which you have.
Check the PCIe generation
Gen 3, Gen 4 or Gen 5. A newer drive works in an older slot at the older speed, so there is no point paying for Gen 5 in a Gen 3 machine.
Check whether there is a spare slot
Some laptops have two, which lets you add storage rather than replace it. That avoids cloning entirely and is much simpler.
Check the warranty position
Many manufacturers permit drive upgrades explicitly. Some do not. Worth knowing before you open the case.
Sequential read speed is the number on the box and the least relevant in daily use. What you feel is random read performance and the drive’s behaviour once its cache is full. A mid-range drive with DRAM cache often feels better than a fast headline drive without one.
Drives worth considering
Samsung 990 PRO 2TB PCIe 4.0 M.2 NVMe SSD
The safe choice for a Gen 4 laptop. What distinguishes it is behaviour when the drive is busy and its cache is exhausted, which is where cheaper drives collapse. If you will be moving large files or working with video, that consistency is what you are paying for.
Samsung 990 EVO Plus 2TB PCIe Gen 4 M.2 NVMe SSD
For general laptop use, the difference between this and the flagship is difficult to perceive. It reaches high speeds on the transfers most people actually do, and 2TB is the capacity that stops storage being a consideration for several years.
WD_Black SN7100 1TB PCIe Gen 4 NVMe SSD
Thermals are the specification laptop upgraders overlook. A drive that runs hot in a thin chassis will throttle, and a throttled fast drive is slower than an efficient moderate one. This is a sensible choice where airflow is limited, and it helps battery life slightly too.
Samsung 9100 PRO 2TB PCIe 5.0 M.2 NVMe SSD
Buy this only after confirming the slot generation, because in a Gen 4 machine it will run at Gen 4 speeds at a Gen 5 price. Where the laptop does support it and can cool it, the difference shows up in large sustained transfers rather than in general use.
Acer Predator GM7000 2TB PCIe Gen 4 NVMe SSD with DRAM cache
The presence of DRAM is the specification to check at the budget end. Drives without it borrow system memory instead, which is fine for light use and degrades noticeably during large copies. This gets the important part right for the money.
What we liked
- The most noticeable upgrade left on most laptops
- 2TB removes storage worries for years
- Straightforward on laptops with an accessible panel
- Old drive becomes a portable drive in an enclosure
What we didn't
- Requires confirming form factor and interface
- Cloning can go wrong and needs a backup first
- Thin laptops may throttle a hot drive
- Some manufacturers discourage user upgrades
Cloning or clean install?
Cloning copies your existing system to the new drive so that nothing changes. It needs a USB enclosure for the new drive, cloning software, and patience. It usually works and occasionally produces a system that will not boot, which is why a backup first is not optional.
A clean install gives you a fresh system with none of the accumulated clutter, and it is often the better outcome on a machine that has been in use for years. It costs you an afternoon of reinstalling applications. If the laptop has felt slow for reasons beyond the drive, the clean install is what will actually fix that.
Back up before you start, to something that is not either of these drives. Cloning tools can select the wrong direction and overwrite the source. A backup makes that an inconvenience rather than a disaster.
Practical notes on the installation
- Discharge static by touching something earthed before handling the drive, and hold it by the edges.
- Disconnect the internal battery if the service manual shows a connector for it, which many do.
- The drive sits at an angle when inserted and lies flat when you fit the retaining screw. Do not force it flat before the screw.
- Move any thermal pad from the old drive to the new one if the laptop has one.
- Update the firmware using the manufacturer’s tool after installation. SSD firmware updates fix real problems.
- Keep the old drive. In a cheap USB enclosure it becomes a fast portable drive and a fallback if anything goes wrong.
Will a faster SSD make my laptop feel faster?
Moving from a hard drive or an old SATA SSD to NVMe is transformative. Moving from one NVMe drive to a faster one is barely perceptible in everyday use. Capacity is usually the better reason to upgrade.
How do I know if my laptop takes NVMe or SATA?
Check the service manual, or run a drive information tool on the existing drive, which will report the interface. The connectors look similar and are not compatible, so this is worth confirming.
Do I need a heatsink on a laptop SSD?
Usually there is no room for one. Choose an efficient drive instead, and reuse any thermal pad the laptop already has. Gen 5 drives in particular can run hot enough to throttle in a thin chassis.
Is 1TB enough, or should I buy 2TB?
1TB suits most general use. 2TB is worth it if you keep games, video projects or large photo libraries locally, and the price difference per terabyte is usually favourable at 2TB.
Can I use the old drive afterwards?
Yes. A USB enclosure turns it into a fast external drive for a few pounds, which is a better outcome than leaving it in a drawer.
The short version
Confirm form factor, interface and PCIe generation from the service manual before buying anything. Choose a drive with DRAM cache and good sustained performance rather than the highest headline number, and prefer an efficient drive in a thin laptop. Back up, then either clone or do a clean install, and keep the old drive in an enclosure.
