The SSD is the part that makes the whole PC feel fast: Windows boots in seconds and games load quickly. But the “fastest” drive on the box is not always the best choice. Here is what really matters when choosing.
HDD≈ 150 MB/s
SATA SSD≈ 550 MB/s
NVMe PCIe 3.0≈ 3 500 MB/s
NVMe PCIe 4.0≈ 7 000 MB/s
NVMe PCIe 5.0≈ 12 000 MB/s
In games and Windows the difference between NVMe generations is small; the big jump is from a hard drive.
1. SATA or NVMe
- SATA SSD looks like a small 2.5-inch box and is limited to about 550 MB/s. It is fine as a second drive for games and files, and the only option for an old PC without an M.2 slot.
- NVMe SSD is a small M.2 stick in the motherboard, several times faster. For a system drive it is the default choice and usually costs about the same as SATA.
- A hard drive is only for storage and backups: Windows and games on it feel slow.
2. PCIe generation: 3.0, 4.0 or 5.0
- An NVMe drive works in any M.2 slot that supports NVMe, but only at the speed the board allows: a PCIe 4.0 drive in a 3.0 slot runs slower, but works fine.
- For games and Windows, PCIe 4.0 is the best value. PCIe 5.0 drives are faster on paper, run hot and cost more, with little difference in games.
- Check the board manual: some M.2 slots share lanes with SATA ports or other slots, and one of them may switch off.
3. How much capacity
- 1 TB is the minimum for a gaming PC: Windows, programs and several games that each take 100 GB or more.
- 2 TB is comfortable and often better value per gigabyte.
- Keep 10–20% of the drive free: a full SSD slows down and wears faster.
4. What the spec sheet hides
- DRAM cache: drives with their own DRAM keep sustained speed better. DRAM-less drives (using host memory) are fine as a secondary drive, but less good as a heavily used system drive.
- TLC or QLC: TLC is faster and lasts longer; QLC is cheaper and its write speed drops hard when the fast cache is full. Choose TLC for the system disk.
- TBW and warranty: the written terabytes and years the maker guarantees. 3–5 years and a few hundred TBW per terabyte is normal.
- Heat: fast NVMe drives throttle when hot. Use the heatsink on the board or the drive (temperature guide).
- Avoid no-name drives with unrealistic speeds and prices.
5. After installation
- Install the drive, check it is visible in the BIOS (BIOS guide) and, if you are installing Windows, follow the clean install guide.
- In Disk Management initialize it as GPT and create the partition.
- Check health in CrystalDiskInfo and speed in CrystalDiskMark (both in our programs article).
- Update the firmware from the maker’s site if there is a newer one.
- Keep a backup: an SSD can fail without warning, and the data cannot be recovered from a dead controller. Errors like INACCESSIBLE_BOOT_DEVICE are described in the blue screen guide.
Not sure which drive fits your build? Ask us for advice or build a balanced PC in our PC configurator.