PCIe Gen 5 SSDs: Real-World Speed vs Marketing Claims
PCIe Gen 5 SSDs promise 12,000+ MB/s sequential speeds. But do you actually notice the difference? We tested against Gen 4 to find out.
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PCIe Gen 5 SSDs have been hitting the consumer market throughout 2025-2026, promising sequential read speeds of 12,000-14,000 MB/s — roughly double the fastest Gen 4 drives. They also cost 50-100% more and generate significantly more heat. We tested Gen 5 drives against Gen 4 in real-world workloads to determine if the premium is justified.
The Speed Claims
Sequential Speed (Marketing Favorite)
Gen 5 SSDs advertise 12,000-14,000 MB/s sequential read and 10,000-12,000 MB/s sequential write. Compared to Gen 4's 7,000-7,400 MB/s reads, that sounds like a massive leap.
Reality check: Sequential speed measures sustained, large-block data transfer — like copying a single massive file. Most computing tasks don't work this way. Your operating system, applications, and games access thousands of small files scattered across the drive (random I/O), not one continuous stream.
Random I/O Speed (What Actually Matters)
Random 4K read/write performance determines how fast your computer feels — boot times, app launches, file searches, and game loading.
Gen 5 drives show only 10-20% improvement in random 4K performance compared to Gen 4. Some Gen 5 drives actually have WORSE random performance than the best Gen 4 drives because the controller prioritizes sequential throughput over random I/O optimization.
Real-World Test Results
We tested three drives:
- Samsung 990 EVO 1TB (Gen 4, $85)
- Samsung 990 Pro 1TB (Gen 4, $99)
- Crucial T700 1TB (Gen 5, $159)
Windows Boot Time
| Drive | Boot Time | |-------|-----------| | 990 EVO (Gen 4) | 12.3 sec | | 990 Pro (Gen 4) | 11.8 sec | | T700 (Gen 5) | 11.5 sec |
Difference: 0.8 seconds. Imperceptible.
Game Loading (Cyberpunk 2077, save to gameplay)
| Drive | Load Time | |-------|-----------| | 990 EVO (Gen 4) | 8.2 sec | | 990 Pro (Gen 4) | 7.4 sec | | T700 (Gen 5) | 6.9 sec |
Difference: 1.3 seconds. Barely noticeable.
Application Launch (Adobe Premiere Pro)
| Drive | Launch Time | |-------|-------------| | 990 EVO (Gen 4) | 4.1 sec | | 990 Pro (Gen 4) | 3.8 sec | | T700 (Gen 5) | 3.5 sec |
Difference: 0.6 seconds. Imperceptible.
Large File Copy (50GB folder of mixed files)
| Drive | Copy Time | |-------|-----------| | 990 EVO (Gen 4) | 52 sec | | 990 Pro (Gen 4) | 38 sec | | T700 (Gen 5) | 22 sec |
Difference: 30 seconds for Gen 5 vs Gen 4 EVO. This is where Gen 5's sequential advantage shows — and it's significant for users who regularly move large files.
Video Export (4K, 10-minute timeline, Premiere Pro)
| Drive | Export Time | |-------|-------------| | 990 EVO (Gen 4) | 3:42 | | 990 Pro (Gen 4) | 3:38 | | T700 (Gen 5) | 3:31 |
Difference: 11 seconds. The CPU is the bottleneck, not the drive.
The Heat Problem
Gen 5 drives consume 8-12W under load — roughly double the power draw of Gen 4 drives. This heat must be dissipated, and most Gen 5 drives throttle (reduce speed) without adequate cooling.
Every Gen 5 drive ships with a heatsink or requires a motherboard-mounted heatsink. In laptops, heat dissipation is challenging, which is why laptop adoption of Gen 5 has been slow.
Gen 4 drives like the Samsung 990 EVO run cool enough to work without any heatsink in most scenarios.
Who Should Buy Gen 5?
Yes, Buy Gen 5 If:
- You regularly transfer very large files (video editors working with RAW footage, data engineers moving databases)
- You're building a workstation where sustained sequential throughput matters
- You want to future-proof for DirectStorage gaming (which is slowly being adopted)
- Price isn't a major concern
No, Stick with Gen 4 If:
- You use your PC for general tasks, gaming, and productivity
- You're on a budget
- Your laptop doesn't have a Gen 5 M.2 slot (most don't yet)
- You care about power efficiency (laptop users)
Our Recommendation
For 95% of consumers, a Samsung 990 EVO 1TB ($85) or Samsung 990 Pro 1TB ($99) delivers effectively identical real-world performance to a Gen 5 drive at 40-50% less cost, with lower heat output and no heatsink requirement.
Save the premium and put it toward more storage capacity. A 2TB Gen 4 drive at $149 is a better purchase for most people than a 1TB Gen 5 drive at $159.
Gen 5 will become the standard as prices drop and heat management improves, likely by late 2027. Until then, Gen 4 is the smart buy.
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