No Motherboard Swap: One Card, Six Configurable Ports
The machine is three years old. You want another drive, a faster network port, and that front-panel Type-C header has been sitting empty since day one.The usual answer is a new motherboard. This card answers differently: one PCIe slot, six positions — and you decide what goes into two of them.
One Slot, Six Positions
The uplink is PCIe Gen4 x4 with 64 Gbps of total bandwidth, backward compatible with Gen3 / Gen2 / Gen1. An x4, x8 or x16 slot will all take it.
The card measures 180 × 69 mm and weighs 100 g net.
Remember this number: 64 Gbps is the master gate. Every port below draws from it.
Two Front Slots: You Decide What They Do
This is where it differs most from an ordinary riser card.
The two M.2 slots on the front are not meant for drives — they are meant for modules. Four are available from LEKUO:
Two slots, four module types — here is what the combinations give you:
A module works the moment it is seated — no need to swap the whole card. Build a NAS today with two SATA modules; turn it into a software router tomorrow with two RJ45 modules. The card stays in the slot.
Two Rear M.2 Slots: Full Gen4 x4, No Compromise
When you need fast storage, use the rear slots.
The two rear M.2 slots are PCIe 4.0 x4 and accept 2280 and 22110 lengths. With a single drive you get close to the theoretical PCIe 4.0 x4 rate, less normal protocol overhead. Run both at once and they share that 64 Gbps — the total throughput is still there, it simply does not stack.
The division of labour is clear: modules on the front, SSDs on the rear. The front's x2 lanes are plenty for a 10G port or for SATA; feeding a Gen4 SSD from them would be a waste.
“No Bifurcation” Saves You a Trip Into the BIOS
A lot of people get tangled up in the phrase “no motherboard bifurcation required”. The “split” here is not about opening the case — it means PCIe bifurcation.
A conventional multi-port card needs the motherboard to split one x16 link into several x4 links so the BIOS can hand them to different devices. If the board does not support it, the card is dead weight.
The PB65MX4 does not need that. It carries an onboard B650 SouthBridge chipset that is itself a PCIe switch: the uplink occupies a single x4, and the card decides how to divide it downstream. Whether the motherboard supports bifurcation makes no difference, and there is nothing to set up in the BIOS.
That means three kinds of machine can take it:
- Older boards (a single PCIe 4.0 x4 slot unlocks the full card; Gen3 works too, at Gen3 speed)
- Pre-built OEM systems (their BIOS is often locked down and bifurcation was never adjustable anyway)
- DIY NAS and software-router builds (zero setup — six positions the moment it is seated)
#LEKUO #PCIe #ExpansionCard #NAS #PCHardware