If a 4TB PCIe 4.0 SSD and a 2TB PCIe 5.0 SSD cost the same, I would put the 4TB drive in a gaming PC. That answer looks almost irresponsible beside a benchmark where the Gen5 drive is twice as fast. It makes much more sense after the fifth 150GB game is installed.
The current flagships are genuinely astonishing. Samsung rates the 9100 PRO at up to 14,800MB/s sequential read and 13,400MB/s write. SanDisk’s WD_BLACK SN8100 reaches up to 14,900MB/s read, with the 2TB and 4TB versions rated as high as 14,000MB/s write. A strong Gen4 drive such as the WD_BLACK SN850X tops out around 7,300MB/s.
Those are not invented marketing units. Under the right sustained workload, Gen5 can move roughly twice as much sequential data through the interface. The mistake is assuming that Windows, a game or a web browser spends its day reading one enormous, perfectly ordered file at that rate.
What the 14,800MB/s number actually describes
Sequential throughput is closest to copying or reading a large continuous block. It matters when transferring high-bitrate video, ingesting a large dataset, moving virtual-machine images, building a cache or scratch disk, or working with other storage fast enough not to become the bottleneck. It is easy to measure and easy to print in large type.
Everyday work is messier. An operating system requests many small files and pieces of files. Games decompress assets, wait for CPU work, build shaders and sometimes pause for network or anti-cheat checks. Application launch time includes code that has nothing to do with the drive. Random latency and software behavior matter, and doubling peak sequential bandwidth does not halve the whole process.
This is why game-loading charts can look almost anticlimactic. In one comparative game test, the Samsung 9100 PRO did not finish first despite its huge sequential rating. Fast NVMe drives were separated by small fractions or a few seconds rather than the 2:1 result implied by their box numbers. The Gen5 drive was not failing; the test was no longer limited by peak sequential transfer.
Microsoft’s DirectStorage documentation explains how games can reduce storage overhead and improve asset delivery through modern NVMe paths. It does not mean every DirectStorage game requires a PCIe 5.0 SSD. A good Gen4 NVMe drive already supplies several gigabytes per second. The game, GPU decompression implementation and the rest of the system determine how much extra bandwidth becomes visible.
I found the same practical anxiety in build discussions. One buyer could choose a 4TB Gen4 drive or a 2TB Gen5 model for roughly the same money and suspected the faster one would be overkill. Most responses pointed toward capacity. That is sensible for a gaming machine because storage pressure creates a daily cost: uninstalling, choosing what stays, or moving games between drives. Waiting an extra second at a loading screen is a theoretical cost until it can be measured.
Capacity can also change the drive itself. The 1TB, 2TB and 4TB versions of one SSD family do not always have identical write speeds, cache behavior or endurance ratings. More NAND packages can give the controller more channels to use in parallel. I would compare the exact capacity on the manufacturer’s datasheet, not read a review of the 4TB flagship and assume its result applies to the 1TB sale model.
The motherboard can quietly turn Gen5 into Gen4
A Gen5 label on the motherboard box does not guarantee every M.2 slot runs four Gen5 lanes. Some slots connect through the CPU, others through the chipset; using one may share lanes with a graphics slot or disable a SATA port. The only reliable answer is the board manual for the exact CPU and slot combination.
Gen5 SSDs are backward compatible. They will normally work in a Gen4 M.2 slot, but the interface caps their sequential speed. An owner who installed a 4TB 9100 PRO in a Gen4 system measured about 6.8GB/s sequential read and write—healthy Gen4 territory and exactly the kind of ceiling I would expect. The drive still worked, yet most of the performance premium was waiting for a future motherboard.
I would not buy that way unless the current Gen5 price was unusually close to a comparable Gen4 model or a platform upgrade was already planned. “Future-proof” hardware earns its name only when the future arrives before a cheaper, better replacement does.
Cooling is the other part hidden by the speed headline. Sustained transfers make high-end controllers and NAND warm, and a drive can reduce performance when it reaches its thermal limit. The latest efficient drives are better than the first Gen5 generation, but I would still use either the SSD’s heatsink version or the motherboard’s M.2 heatsink. I would not stack both. Remove the protective film from the thermal pad, make sure the pad contacts the controller and NAND as the instructions show, and give the motherboard some airflow.
The WD_BLACK SN8100 is the Gen5 model I find easiest to justify for a new workstation because its official material emphasizes both high throughput and improved efficiency. Samsung’s 9100 PRO is available with or without a heatsink and in capacities up to 8TB, making it a straightforward premium option when software support and a known brand ecosystem matter. The Crucial T705 remains extremely fast at up to 14,500/12,700MB/s in its 2TB version, but it belongs to the hotter, no-compromise end of the category; I would not hide it under a decorative motherboard cover with no airflow.
For a gaming build, I would instead watch Gen4 models such as the WD_BLACK SN850X, Samsung 990 PRO and other well-reviewed TLC drives with a proper warranty. The sale price, capacity and exact model matter more than chasing the last 200MB/s. I would avoid replacing a healthy fast Gen4 system drive just because a Gen5 benchmark now has a taller bar.
The answer changes for someone who can describe the storage bottleneck without mentioning games. If a video editor repeatedly copies hundreds of gigabytes from another equally fast drive, a Gen5 SSD can shorten a real waiting period. The same applies to a developer juggling large virtual machines, a workstation unpacking huge archives, a data workflow that performs sustained reads, or a scratch disk that is filled and cleared all day. Time saved in a repeated paid task can recover the premium.
Even then, I would check the entire path. Copying from a Gen4 source cannot arrive at Gen5 speed. A 10Gbps external enclosure tops out far below either flagship. A full pseudo-SLC cache can make a long write slow down. And the benchmark shown on a retail page is normally an “up to” result obtained under specific queue depth, cooling and capacity conditions.
My buying order is capacity first, then a reputable controller and NAND configuration, warranty/endurance, price, and finally interface generation. For a fresh high-end workstation with a true Gen5 slot and a workload that moves large files, the SN8100 or 9100 PRO is a defensible tool. For a general PC or gaming machine, a 2TB or 4TB Gen4 drive remains the quieter decision: plenty fast, easier to cool and less likely to make me delete something on Sunday night.
PCIe 5.0 is not a scam. It is simply a very fast answer to a question many home PCs are not asking yet.
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