PCIe 5.0 runs at 32 GT/s per lane, twice the 16 GT/s of PCIe 4.0. A full x16 slot moves roughly 63 GB/s in each direction on PCIe 5.0 against roughly 32 GB/s on PCIe 4.0. The slots are the same shape and every generation is backwards compatible: a PCIe 5.0 card or SSD works in a PCIe 4.0 slot at PCIe 4.0 speed, and an older card works in a newer slot.
Lanes, generations and slot sizes
Two numbers describe a PCIe link: the generation (3.0, 4.0, 5.0), which sets the speed per lane, and the width (x1, x4, x8, x16), which is the number of lanes. A slot’s physical size doesn’t always match its wiring: a full-length slot lower on the board is often wired x4. The motherboard manual lists what each slot and M.2 socket actually runs at.
The CPU provides a fixed number of lanes: usually 16 for the graphics card and 4 for one M.2 SSD, with the chipset adding more at lower speed. When a board has more slots than lanes, some share: fill one M.2 socket and a slot or a SATA port may switch off, or the graphics slot may drop from x16 to x8. The manual’s “bandwidth sharing” table explains which.
Graphics cards: rarely worth paying extra for
TechPowerUp tested the RTX 5090, the card best able to use the extra bandwidth. In a PCIe 4.0 x16 slot it was about 1% slower on average than in PCIe 5.0, and 2–4% slower in PCIe 3.0. For a gaming build, a PCIe 5.0 graphics slot isn’t a reason to buy a more expensive motherboard.
The exception is cheaper cards that use only eight lanes, such as the RTX 5060 Ti. When an 8 GB card runs out of video memory it leans on the PCIe link, and the slot speed starts to show: in TechSpot’s testing the RTX 5060 Ti 8GB was 14–17% faster on PCIe 5.0 than on PCIe 4.0 in those games, while the 16 GB version barely changed. On an older PCIe 3.0 or 4.0 board, pick a card with more VRAM or a full x16 link.
SSDs: faster copies, similar game loading
PCIe 5.0 NVMe drives read at up to about 14,500 MB/s (Crucial T705) and 14,700 MB/s (Samsung 9100 PRO), around double the fastest PCIe 4.0 drives. You feel that when copying large files, editing high-bitrate video or moving big projects around.
Game loading is a different story. Load-time tests have found PCIe 5.0 drives only fractions of a second faster than good PCIe 4.0 drives in most games, because loading is limited more by the CPU unpacking game data than by the drive. DirectStorage, which moves some of that unpacking to the graphics card, is still used by few games. A good PCIe 4.0 drive remains the sensible choice for a gaming build.
PCIe 5.0 drives also run hot. Use the M.2 heatsink that comes with the motherboard or buy the drive’s heatsink version. Without one, the drive slows itself down during long transfers.
Which platforms have PCIe 5.0
- AMD AM5: X870E and X670E boards have PCIe 5.0 for both the graphics slot and at least one M.2 slot. X870, B850 and B650E boards have at least one PCIe 5.0 M.2 slot; whether the graphics slot also runs at PCIe 5.0 depends on the board. B650, A620 and B840 boards are generally PCIe 4.0 or slower.
- Intel LGA1851 (Core Ultra 200S): the CPU provides 16 PCIe 5.0 lanes for graphics and 4 more for one M.2 slot. Z890 and B860 boards usually wire up both.
- Intel LGA1700 (12th–14th gen Core): many Z690 and Z790 boards run the graphics slot at PCIe 5.0. A PCIe 5.0 M.2 slot, where a board has one, usually borrows lanes from the graphics slot and drops it to x8.
Always check the motherboard manual for which slot runs at which speed, and whether filling one M.2 slot disables another.
PCIe 6.0 and 7.0
The standards are ahead of the hardware you can buy. PCI-SIG published PCIe 6.0 in 2022 and released PCIe 7.0 to its members in June 2025, but as of September 2026 both are found only in data-centre equipment. No consumer desktop CPU or chipset supports PCIe 6.0 yet, and reports don’t expect one before 2027. A PCIe 5.0 board is the newest you can buy for a gaming PC today.