Game load time estimator: NVMe vs SATA vs hard drive
How much faster will a game load from a faster drive? Enter how much data the game reads and the speed of your drive. The estimate includes the point where the processor, not the drive, becomes the limit.
Why faster drives help less than the numbers suggest
Moving from a hard drive to an SSD is one of the biggest upgrades a gaming PC can have, because a hard drive reads about 150 megabytes per second and a SATA SSD about 550. Past that the gains shrink. Games do not just read data; they decompress it, build objects, compile shaders and start systems, and that work happens on the processor. Once the drive can supply data faster than the processor can use it, a faster drive no longer shortens the load.
This estimator divides the data read by the slower of the drive speed and a processing limit, then adds a fixed overhead for engine start-up. The result shows the pattern clearly: big gains from hard drive to SATA to NVMe, then very little from a fast NVMe to a faster one.
Typical peak read speeds by drive type
Rounded peak sequential reads, used as the defaults in the estimator. Real drives vary by model.
| Drive type | Typical peak read | Time to read 20 GB |
|---|---|---|
| Hard drive | 150 MB/s | 2 min 13 s |
| SATA SSD | 550 MB/s | 36 s |
| PCIe 3.0 NVMe | 3,500 MB/s | 6 s |
| PCIe 4.0 NVMe | 7,000 MB/s | 3 s |
| PCIe 5.0 NVMe | 12,000 MB/s | 2 s |
Sequential speeds versus real loads
The speeds quoted for drives are peak sequential reads, which means reading one large file in a straight line. Game loads read thousands of smaller files in a mixed pattern, which is slower on every drive and especially on hard drives, where the head must move. That is why a hard drive often feels far slower than its sequential figure suggests, while the gap between SATA and NVMe SSDs is smaller in practice than the headline numbers imply.
Some newer games use direct streaming from fast SSDs to the graphics card, which reduces the processor part and lets very fast drives help more. Even so, expect real loads to fall short of the table, and use it to compare drives rather than predict exact seconds.
Choosing a drive for games
For most players a PCIe 3.0 or 4.0 NVMe drive is the sweet spot: fast loads, modest price and plenty of capacity. A SATA SSD is a big step up from a hard drive and still fine for a large library. A hard drive is best kept for archives and recordings. Capacity matters as much as speed, because modern games are large, so check the install size of your favourites with the download time calculator.
Drive endurance is rarely a concern for gaming, as the SSD endurance calculator shows, but keep backups of anything you cannot replace.
How to use the game load time estimator
- Estimate how much data your game reads during a load. Open-world games read more than level-based ones.
- Choose your drive type from the list.
- Leave the processing limit at 2,000 MB/s or lower it for an older processor.
- Add a fixed overhead for engine start-up.
- Compare the table to see what an upgrade would save.
Common mistakes to avoid
- Expecting the headline speed of a fast NVMe drive in real games.
- Ignoring the processor. Past a point it sets the load time.
- Counting the whole install size as read on every load.
Related tools and guides
Keep going with these: SSD endurance calculator, download time calculator, recording size calculator, RAM for gaming calculator, best graphics cards guide.
Frequently asked questions
Is NVMe faster than SATA for games?
In raw speed yes, about six times faster or more. In game loading the gap is smaller, because loads also depend on the processor and many small reads. You will notice NVMe most in very large games and when moving big files.
Will a faster SSD reduce my load times?
Up to a point. Moving from a hard drive to any SSD helps a lot. Moving from a fast NVMe to a faster one helps little, because the processor and engine set the pace. This estimator shows the point where the drive stops being the limit.
Why is my game slower to load than the estimate?
The estimate uses peak sequential speeds. Real loads read many small files, compile shaders and run engine setup, all of which add time. Compare the estimate between drives rather than relying on the exact seconds for one drive. Real loads are almost always slower.
Do I need a PCIe 5.0 SSD for gaming?
No. A PCIe 4.0 or even 3.0 drive loads games almost as fast in practice. Faster drives cost more and run hotter. Spend on capacity or a better graphics card first, unless you move large files constantly. Spend the difference on capacity.
Should I install games on a hard drive?
Only if space is short and you can accept longer loads. Modern open-world games can stutter on a hard drive as they stream data. Install the games you play most on an SSD and keep older titles on the hard drive.
Independent site. Not affiliated with or endorsed by NVIDIA, AMD or Intel. Product names are trademarks of their owners.