For gaming alone, a good PCIe 4.0 SSD is the better choice for most builders, because PCIe 5.0 drives are roughly twice as fast on paper but reviewers report real game load times that differ by only a second or so, while Gen 5 drives run hotter and need better cooling. Gen 5 makes sense mainly for large file transfers, video editing and heavy professional workloads.
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What the Two Generations Are
PCIe is the connection between your motherboard and components such as the graphics card and NVMe SSDs. Each generation doubles the per-lane bandwidth of the previous one. An M.2 SSD normally uses four lanes. On PCIe 4.0 that gives a theoretical ceiling near 8,000 MB/s, and top Gen 4 drives are commonly listed at about 7,000 to 7,450 MB/s sequential read. On PCIe 5.0 the ceiling roughly doubles, and leading Gen 5 drives are listed at around 12,000 to 14,500 MB/s. These are the makers’ sequential figures, which describe large continuous reads, not the small random reads typical of game loading.
Both generations use the same M.2 2280 form factor and the same NVMe protocol, so a Gen 4 and a Gen 5 drive look nearly identical. Gen 5 drives are backward compatible with Gen 4 slots and will simply run at Gen 4 speed there, and the same is true in reverse for Gen 4 drives in Gen 5 slots.
Side-by-Side Comparison
| Factor | PCIe 4.0 SSD | PCIe 5.0 SSD |
|---|---|---|
| Typical top sequential read | About 7,000 to 7,450 MB/s | About 12,000 to 14,500 MB/s |
| Real game load difference | Baseline | Reported at about half a second to two seconds faster |
| Heat output | Moderate; a motherboard heatsink is often enough | High; a substantial heatsink and good airflow are advised |
| Idle power | Lower | Higher, reported at roughly 30 to 50 mW against about 20 mW |
| Platform needed | Most boards from recent years | A board with a Gen 5 M.2 slot, such as many AM5 and Intel 800-series boards |
| Best use | Gaming, general use, everyday builds | Large transfers, editing, data and AI workloads |
| Relative cost | Lower | Higher |
Does Gen 5 Help Games?
Most independent and retailer-written comparisons agree that the answer is very little today. Reports cite load-time gaps of well under two seconds between a good Gen 4 drive and a Gen 5 drive, with some games showing differences under half a second. Reviewers explain that modern game loading is limited by engine processing, CPU decompression and shader work, not raw drive bandwidth. Frame rates are not affected by storage speed in normal play.
The possible exception is DirectStorage. Microsoft’s DirectStorage lets games stream assets with less CPU overhead, and a few titles that use it have shown slightly larger gaps. One retailer comparison reported a gap of under two seconds in a DirectStorage-enabled title. However, adoption is limited, and some analyses say CPU or GPU decompression speed becomes the limit before the drive does. Treat claims about future-proofing with caution: Gen 5 may benefit future games, but that is a prediction, not a measured result for today’s library.
Heat and Throttling
Heat is the real everyday difference. Gen 5 controllers draw more power and run hotter, and reviewers report that drives without adequate cooling can throttle during sustained writes, which cancels part of their speed advantage. Many Gen 5 drives are sold with large heatsinks, and some motherboards include thicker M.2 covers or fans. A Gen 5 drive installed under a graphics card in a cramped case may run hotter than expected.
Gen 4 drives are easier to cool and often work well with the heatsink supplied by the motherboard. If you build a small form factor PC, a Gen 4 drive is usually the lower-hassle choice. Always follow the motherboard manual for M.2 slot placement, since some boards share lanes between M.2 slots and PCIe slots, and a Gen 5 slot may reduce another connection’s speed.
Who Should Pick Which
Gamers
Buy a quality PCIe 4.0 drive from a reputable maker, look for a good controller and a decent endurance rating, and put the savings toward a better GPU or more capacity. Capacity and sustained write performance matter more than peak speed for a game library.
Creators and professionals
Editors working with high-bitrate video, large project files or big datasets may benefit from Gen 5 when moving multi-gigabyte files frequently, provided the rest of the workflow, such as the source drive or network, can keep up.
Budget builders
A mid-tier Gen 4 drive gives excellent value. A DRAM-less budget drive may be fine for games, but check the maker’s sustained-speed notes.
Future-minded builders
If your board already has a Gen 5 M.2 slot and you want headroom, a Gen 5 drive is not harmful, as long as you budget for cooling and accept the higher power draw.
Common Myths
- “Twice the speed means twice as fast game loading.” Sequential benchmarks do not translate to game load times, which depend on many other factors.
- “Gen 5 will raise my FPS.” Storage does not meaningfully change frame rate in normal gameplay.
- “A Gen 5 drive in a Gen 4 slot is wasted.” It works, but is limited to Gen 4 speed.
- “Every Gen 5 drive is equally fast.” Controllers, flash type and cooling differ, and sustained speeds vary widely.
- “You need Gen 5 for DirectStorage.” DirectStorage works on fast Gen 3 and Gen 4 NVMe drives as well.
Practical Recommendation
Pick the best PCIe 4.0 drive you can afford in the capacity you need, and add a heatsink if your board lacks one. Choose PCIe 5.0 only if you regularly move very large files, your motherboard has the slot, and you are comfortable with extra cooling. Install the drive following the motherboard manual, power the PC off and unplug it before opening the case, and update the SSD firmware from the maker’s tool when advised, without interrupting the update.
Capacity planning is also worth a thought: modern game libraries are large, so a roomy Gen 4 drive often serves a gamer better than a small, expensive Gen 5 drive, and a second drive can be added later in another M.2 slot.
Frequently Asked Questions
Will a PCIe 5.0 SSD make my games load faster?
Slightly at best. Reviewers report differences of about a second or less in most games compared with a strong Gen 4 drive. The gain is rarely noticeable during normal play.
Do I need a heatsink for a PCIe 4.0 SSD?
A heatsink is advisable, and many motherboards include one. Gen 4 drives usually stay manageable with a basic cover and decent case airflow. Check the SSD maker’s guidance for your model.
Can I put a Gen 5 SSD in a Gen 4 slot?
Yes. It is backward compatible and will run at Gen 4 speed. You lose the extra performance but the drive works normally.
Is DirectStorage a reason to buy Gen 5?
Not by itself. DirectStorage benefits from fast NVMe drives, but it does not require Gen 5, and few games use it heavily. Reports suggest other bottlenecks limit the gains.
Does Gen 5 use more power?
Generally yes. Reported idle draw is higher, and load power and heat are also greater, which matters most in laptops and small cases.
Which is better for a PlayStation 5 or handheld upgrade?
Those devices have their own storage requirements. Follow the console or handheld maker’s compatibility list, as Gen 5 speed may not be used at all.
