ASUS Hyper M.2 x16 Gen5 Card: four NVMe SSDs on one PCIe slot

The ASUS Hyper M.2 x16 Gen5 Card is an expansion card that lets one full-length PCIe slot carry up to four M.2 NVMe solid-state drives. It suits builders who have run out of M.2 sockets on the motherboard, or who want several fast drives working together as one RAID array.

How one slot carries four drives

The card plugs into a PCIe x16 slot and splits its lanes between the four M.2 sockets. ASUS says it supports PCIe 5.0 and 4.0 drives and quotes up to 512 Gbps of total bandwidth. In general, this kind of card works by dividing the slot into four groups of lanes, which usually needs the motherboard to support PCIe bifurcation. That is normally a firmware setting, and the board's manual explains whether and how it is offered.

Drives in the 2242, 2260, 2280 and 22110 lengths are listed as supported, which covers the common consumer sizes and the longer ones used in some workstation and server drives.

What PCIe 5.0 means here

Each PCIe generation roughly doubles the bandwidth of the one before. A PCIe 5.0 drive can, in principle, move data much faster than a PCIe 4.0 drive, but only if the drive, the slot and the processor's lanes all support it. A slower drive in the card simply runs at its own speed, and the card's headroom goes unused.

Power and cooling

Fast NVMe drives produce a lot of heat under sustained work, and they slow themselves down when they get too hot. ASUS addresses this in three ways: a large heatsink, thermal pads on both the upper and lower faces of the drives, and an active blower-style fan. The listing says this limits temperature-related throttling during heavy, sustained transfers.

Power comes from a 6-pin PCIe power connector feeding a two-phase power design, which ASUS rates at up to 14 watts of output for the latest NVMe drives. The fan has an extra cable so its speed can be managed from a chassis fan header on the motherboard. Blower fans are audible under load, so noise tolerance is worth thinking about for a quiet desktop.

RAID across platforms

ASUS says the card supports RAID on both AMD and Intel platforms and can create a bootable array of up to four M.2 SSDs. Typical choices are RAID 0 for speed, RAID 1 for mirroring and RAID 10 for a mix, though which levels are available depends on the platform's RAID software. RAID 0 has no redundancy, so it does not replace backups.

Size and fit

The card measures about 4.8 x 0.5 x 11.0 inches (roughly 12 x 1.3 x 28 cm) and weighs 1.9 lb (about 0.86 kg). That length is typical of a full-length expansion card, so it needs a case with room and a free x16 slot, along with some space for airflow around the fan.

Who it suits

It suits people building workstations, video editing machines, home servers or storage-heavy desktops that want more fast drives than the board offers. It makes less sense for a build with one or two drives and free M.2 sockets.

What to check before you buy

• Bifurcation support: confirm your motherboard and processor can split an x16 slot into four x4 groups, and in which slot.
• Lanes: a graphics card in another slot can share lanes, so check how your board allocates them.
• Power: make sure the power supply has a spare 6-pin PCIe connector.
• Case space: check the slot position, the card's length and clearance for the fan.
• Drive heights: check that your SSDs fit the card's sockets and thermal pads, particularly drives with their own heatsink.
• RAID plan: decide which RAID level you want and how you will back up the data.

The short version

• An expansion card for up to four M.2 NVMe SSDs in one PCIe x16 slot.
• Supports PCIe 5.0 and 4.0 drives, with up to 512 Gbps of bandwidth quoted by ASUS.
• Heatsink, thermal pads and a blower-style fan; 6-pin power connector.
• Bootable RAID arrays of up to four drives on AMD and Intel platforms.
• Needs a motherboard that supports slot bifurcation.

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