Modern workstations and servers are frequently bottlenecked by a shortage of physical interfaces for high-speed storage, severely constraining system scalability. Historically, overcoming this limitation necessitated high-end motherboards supporting PCIe bifurcation—a feature typically reserved for the premium enterprise or enthusiast segments. The introduction of an expansion card powered by the AMD B650 chipset is a game-changer, providing a standalone solution for managing data throughput. Transforming a single PCIe slot into a comprehensive NVMe and USB hub is now within reach for a much broader audience.
Lekuo has introduced an unconventional addition to the peripherals market: the PB65MX3 expansion card, a device that effectively condenses motherboard-grade logic into a compact PCIe module. At its core lies the AMD B650 chipset, which functions as an intelligent switch, distributing PCIe 4.0 x4 interface resources across a multitude of peripheral devices. This architecture allows users to circumvent a primary bottleneck found in most consumer motherboards—the requirement for BIOS-level hardware support for lane bifurcation when operating multiple M.2 drives via a single card.
The PB65MX3 is primarily engineered for aggressive storage expansion, providing four M.2 slots for NVMe drives and four SATA III ports supporting speeds of 6 Gbps. However, this versatility comes with an inherent technical trade-off tied to the limited bandwidth of the primary communication channel with the host system.
PCIe lane allocation is handled dynamically. When only the two primary M.2 slots are occupied, they operate in PCIe 4.0 x4 mode, delivering maximum throughput for each drive. However, if all four slots are populated, the system automatically shifts them to PCIe 4.0 x2 mode. Despite this reduction in individual drive speed, the aggregate throughput of the entire subsystem remains capped by the physical interface connecting the card to the motherboard (PCIe 4.0 x4). This makes the device an ideal solution for workloads prioritizing capacity and drive quantity over the extreme peak performance of a single NVMe unit.
Beyond storage, the Lekuo PB65MX3 doubles as a high-performance USB hub. The board features one 20 Gbps USB-C port, another 10 Gbps USB-C port, and two classic USB-A ports, also supporting the 10 Gbps standard. This configuration transforms the card into a versatile gateway for external storage arrays and professional peripherals.
In terms of hardware design, the device maintains a standard form factor of 174 × 69 mm. While the controller can operate using power from the PCIe slot alone, an additional 6-pin power connector is provided to ensure stable energy delivery to connected USB devices. This is critical when utilizing power-hungry external SSDs or peripherals to prevent voltage drops and potential data loss.
Broad OS compatibility ensures seamless integration across the modern software stack, including Windows 10, Windows 11, macOS, and Linux. By leveraging standard AMD chipset drivers, the device functions as a transparent storage and USB controller, requiring no complex configuration or proprietary software. Currently available on the Chinese market for approximately $89, the PB65MX3 presents a compelling, cost-effective alternative to expensive RAID controllers or the need to upgrade to a high-end motherboard with an expanded port array.
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