: Match the generation to the device's actual bandwidth need , not just the largest number. For 99% of gaming builds today (2025), PCIe 4.0 remains the price/performance sweet spot.

: PCIe uses low-voltage differential signaling to minimize electromagnetic interference and allow for extremely high clock speeds. The Evolution of PCIe Performance

Each new generation doubles the data rate per lane. Here is the current landscape:

PCIe (Peripheral Component Interconnect Express) is a high-speed interface standard that connects peripherals like graphics cards, storage devices, and network cards to a computer's motherboard. Here are some key PCIe specifications and an interesting review:

For example, the Sabrent Rocket PCIe 4.0 NVMe SSD, which uses the PCIe 4.0 interface, achieved the following performance:

Higher generations demand stricter design:

| If you have... | Upgrade to Gen 4.0? | Upgrade to Gen 5.0? | | :--- | :--- | :--- | | Gen 3.0 motherboard + Gen 4.0 SSD | – double SSD speed | Not yet (minimal gain for storage) | | Gen 4.0 motherboard + RTX 4090 | No | No (GPU doesn't saturate Gen 4.0 x16) | | Data center AI accelerator (H100) | N/A | Yes – Gen 5.0 x16 cuts training time |

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