PCIe 4.0 or PCIe 5.0? Choosing an NVMe SSD for a Gaming PC in 2026

For most gaming PCs, a PCIe 4.0 NVMe SSD is still the sensible choice in 2026. The best Gen4 drives read at 7,000 to 7,450 MB/s, which games and Windows rarely saturate. PCIe 5.0 doubles the bus bandwidth and reaches up to 14,800 MB/s, but the premium mainly pays off when you move very large files, not when you load a level.

Gen4 vs Gen5 at a glance

The bus figures follow the PCI Express specification: every generation doubles the per-lane rate, and with 128b/130b encoding four PCIe 4.0 lanes deliver roughly 7.88 GB/s in each direction. The Gen5 figure is simply that number doubled. Real drives hit the limits of their controller and flash long before they hit the bus.

Why games don't feel the difference

Loading a game is not just reading files. The CPU decompresses assets, the engine prepares shaders and the GPU receives textures. While those stages run, a 7,000 MB/s drive and a 14,000 MB/s drive spend much of the time waiting on the rest of the system.

PCWorld, which has reviewed close to three dozen PCIe 4.0 SSDs, puts it plainly: the real-world gap to Gen5 is smaller than you might expect, a lot of software (Windows included) cannot take full advantage of Gen5, and the price premium is still steep.

What about DirectStorage? Microsoft's DirectStorage moves asset decompression to the GPU, which does help. But its stated minimum is a PCIe 3.0 NVMe SSD plus a DirectX 12 GPU with Shader Model 6.0 support. A faster Gen4 drive gives better results, yet nothing in the requirements calls for PCIe 5.0. Buying Gen5 "for future DirectStorage games" is premature.

When PCIe 5.0 is worth it

Gen5 earns its price when a drive regularly streams tens or hundreds of gigabytes in one go:

• editing 4K and 8K footage straight from the drive;
• loading large datasets or local AI model weights into memory;
• copying virtual machine images and big archives between two fast drives.

Samsung's flagship 9100 PRO, for example, is rated for sequential reads of up to 14,700 MB/s on the 1TB and 2TB models and up to 14,800 MB/s on the 4TB and 8TB models. In heavy file work, that saves real minutes. In gaming, browsing and office tasks, the saving is measured in fractions of a second.

Check your platform too. A Gen5 SSD only runs at Gen5 speed in a Gen5 M.2 slot. Drop it into a Gen4 slot and it behaves like a Gen4 drive, so you pay for headroom you never use.

DRAM vs HMB: a spec that matters more than the box speed

Every SSD keeps a mapping table that links logical addresses to physical flash cells, and the controller needs a fast cache to read it.

• DRAM drives carry their own memory chip. The 2TB Samsung 990 PRO, for instance, has 2GB of LPDDR4.
• HMB drives (Host Memory Buffer) have no DRAM and borrow a small slice of system RAM instead. The WD_BLACK SN7100 uses 64MB.

In PCWorld's testing, HMB drives can deliver slightly faster sequential transfers but trail DRAM drives in small 4K random operations. The result is a marginally snappier system with DRAM, which the reviewers admit is very hard to spot with the naked eye.

The takeaway: for the boot drive of a workstation that handles thousands of small operations, DRAM is preferable. For a game library, a good TLC drive with HMB performs just as well.

TLC vs QLC flash

• TLC (three bits per cell) sustains speed longer and usually has higher endurance.
• QLC (four bits per cell) costs less to produce and enables higher capacities, but write speed drops more sharply once the cache fills. PCWorld notes this on the WD Blue SN5100, which slows during very long writes.

QLC is fine for games, which are written once and then mostly read. For video editing or constant rewriting of large files, choose TLC.

How much TBW do you really need?

TBW (terabytes written) is the amount of data the manufacturer allows you to write under warranty. The mainstream norm today is about 600TBW per terabyte of capacity with a five-year warranty. That is what you get with the WD_BLACK SN7100 (300, 600 and 1,200TBW for the 500GB, 1TB and 2TB models) and the Samsung 990 PRO (600 and 1,200TBW for 1TB and 2TB).

Some drives go well beyond that: the 2TB Seagate Game Drive is rated for 2,550TBW, more than double the norm. Others sit below it, such as the compact QLC-based Crucial P310 at 220TBW for 1TB and 440TBW for 2TB. Even so, Tom's Hardware's reviewer concluded that you would have to install and uninstall a lot of games over five years to get anywhere close.

Unless you write hundreds of gigabytes every day, the gap between 600 and 1,200TBW won't show up in practice. Endurance matters for workstations running constant renders, video capture or databases.

Form factor: check the slot length

The numbers in an M.2 size are the board's width and length in millimetres.

A long drive won't fit a short bay, and a short drive in a long slot needs a mounting point at its length. Check your motherboard or laptop manual before you order.

Verified specs of popular PCIe 4.0 drives

Figures are rated maximums from manufacturer datasheets and reviews. Smaller capacities are usually slower: the 500GB SN7100 is rated at 6,800 MB/s read and 5,800 MB/s write.

One naming note: the WD_BLACK SN7100 and WD Blue SN5100 are moving to SanDisk branding as the Optimus GX 7100 and Optimus 5100. They are the same drives, not new models.

SSD prices in 2026: why they keep rising

NAND flash has been getting more expensive throughout 2026 because of demand from AI servers. In its 30 September 2026 forecast, TrendForce projected NAND contract prices to rise another 15 to 20% quarter on quarter in Q4, and expects enterprise SSD bit demand to grow by more than 80% year on year in 2026. Suppliers are prioritising server storage, and consumer drives get what is left.

PCWorld gives a concrete US retail example: the 2TB WD Blue SN5100 once sold for $150 and cost $285 when they last updated their guide.

In that market, put your money into capacity before interface generation. A 2TB PCIe 4.0 drive does more for a gaming PC than a 1TB PCIe 5.0 drive you'll keep clearing out to make room for new releases.

Our recommendations

• Gaming PC: PCIe 4.0 with TLC flash, 2TB or more. An HMB drive like the WD_BLACK SN7100 or a DRAM drive like the Samsung 990 PRO will perform the same in games.
• Editing and AI workstation: a DRAM boot drive plus a PCIe 5.0 project drive, provided the platform has a Gen5 M.2 slot.
• Secondary game library drive: QLC such as the WD Blue SN5100 is acceptable, since games are mostly read.
• Handheld gaming PC: 2230 only, for example the Crucial P310.

If you're specifying a new PC, the HYPERPC configurator lets you choose your boot and secondary drives alongside the rest of the components. For general SSD buying basics, see our guide How to choose an SSD drive for your computer.