Blog về công ty Mingjiada Supplies and Recycles the ASMedia ASM2464PDX USB4 to PCIe Gen4 x4 Controller

As USB4 and Thunderbolt 4 peripherals have rapidly gained widespread adoption, the bandwidth ceiling for device-side controllers was once limited to 32 Gbps under PCIe Gen3 x4, preventing the 40 Gbps interface from fully realizing its theoretical performance. The launch of ASMedia’s ASM2464PDX has changed this landscape—as the world’s first USB4 host controller with a downstream port supporting PCIe Gen4 x4, it has ushered USB4 external storage and PCIe device expansion into the era of “full 40 Gbps” performance for the first time. Mingjiada Electronics has built a two-way service system centered on the ASM2464PDX, featuring “brand-new, genuine, in-stock supply + global high-price buyback of inventory,” providing stable supply chain support for customers in the storage, docking station, AI edge computing, and industrial control sectors.

I. What Is the ASM2464PDX: The Leap from “Storage-Specific” to “General-Purpose PCIe Expansion”

The ASM2464PDX belongs to ASMedia’s USB4/Thunderbolt-to-PCIe/NVMe accessory controller family. While it shares the same lineage as the ASM2464PD—which is designed for portable SSDs—its market positioning is significantly broader: While the ASM2464PD is primarily designed for single-chip NVMe SSD storage solutions, the ASM2464PDX maintains storage compatibility while expanding its support to general-purpose PCIe devices, including AI accelerator cards, external graphics cards, PCIe network controllers, AHCI RAID controllers, xHCI controllers, and even PCIe packet switches. In other words, it is no longer merely a “USB4 hard drive enclosure chip,” but rather a universal bridging platform for external PCIe hardware connected via the USB4 interface.

The chip has officially received Intel Thunderbolt 4 certification and holds USB4 device-side certification. It achieves 20 Gbps × 2 channels—aggregating 40 Gbps of upstream bandwidth—over a USB4/Thunderbolt Gen3 x2 link, while remaining backward compatible with USB 3.2, USB 2.0, and Thunderbolt 3, covering the full compatibility range from the latest USB4 hosts to legacy devices.

II. Key Specifications: Why PCIe Gen4 x4 Is a Game-Changer

The most critical technological breakthrough of the ASM2464PDX lies in the generational upgrade of the downstream PCIe link. Previously, USB4 device-side controllers were generally limited to PCIe Gen3 x4, with a theoretical bandwidth ceiling of 32 Gbps, creating a “structural gap” between this and the 40 Gbps interface bandwidth of USB4/Thunderbolt 4. The ASM2464PDX upgrades the downstream link to PCIe Gen4 x4, aligning interface bandwidth with device bandwidth for the first time. This ensures that external NVMe SSDs or high-speed PCIe devices are no longer constrained by the controller’s PCIe generation.

In terms of lane configuration, the ASM2464PDX offers high flexibility: PCIe Gen4 x4 can be split into 1×4, 2×2, 4×1, or 1×2+2×1 configurations. A single chip supports up to four concurrent PCIe device connections, enabling the construction of multi-drive storage arrays or multi-device expansion docks without the need for an external PCIe switch chip. Additionally, the chip natively supports 1-to-1 and 1-to-3 data cloning, enabling the complete synchronization of source SSD data to up to three target drives, providing hardware-level acceleration for data replication workstations and bulk deployment scenarios.

Other key integrated features include: two integrated USB 20 Gbps PHYs and USB Type-C CC logic, supporting reversible plug detection and PD Sink mode; an integrated BMC PHY, which enables more advanced power delivery roles through an external, independent PD controller via I2C; a 10×10 mm² FCCSP green package with a local 25 MHz crystal oscillator, supporting SPI, I2C, GPIO, and UART interfaces for easy system-level customization.

ASM2464PDX Core Specifications at a Glance

Chip Type: USB4/Thunderbolt to PCIe/NVMe Device Controller

USB Link: USB4/Thunderbolt Gen3 x2 (20 Gbps × 2, aggregated to 40 Gbps)

Backward Compatibility: USB 3.2 / USB 2.0 / Thunderbolt 3

Downstream PCIe: PCIe Gen4 x4, configurable as 1×4 / 2×2 / 4×1 / 1×2+2×1

Maximum Number of PCIe Devices: 4

Data Cloning: 1-to-1 / 1-to-3 SSD full-disk cloning

Package: 10×10 mm² FCCSP, RoHS Green

Certifications: Intel Thunderbolt 4; USB4 Device Certification

III. Typical Application Scenarios: Who Is Driving Demand for the ASM2464PDX

Portable SSDs and high-speed storage expansion. When paired with a USB4 host (such as the ASM4242 platform), USB4 SSD solutions based on the ASM2464PDX can achieve sequential read/write speeds of approximately 3,683 MB/s and 3,715 MB/s, with peak speeds nearing 3,800 MB/s—roughly double that of traditional USB 3.2 Gen 2×2 solutions. For scenarios where “external drives are used as internal drives”—such as high-bitrate video editing or direct read/write operations on large project files—this level of bandwidth ensures that external storage no longer constitutes a bottleneck in the workflow.

External eGPUs and AI acceleration cards. This is the key new use case that distinguishes the ASM2464PDX from the ASM2464PD. At CES 2026, ASMedia demonstrated an integrated solution featuring the ASM2464PDX paired with the PCIe Gen4 switch ASM58012, which simultaneously supports external graphics cards, multiple NVMe SSDs, and 10GbE networking, building a USB4 expansion platform tailored for AI edge computing and mobile workstations. For the vast number of laptops and mini PCs that have only integrated graphics but feature USB4/Thunderbolt ports, the ASM2464PDX provides a plug-and-play external GPU or AI acceleration pathway, opening up market opportunities for performance upgrades of existing devices.

Multi-bay NAS and data cloning workstations. With support for four devices on a single chip and 1-to-3 cloning capabilities, the ASM2464PDX is suitable for professional-grade multi-bay storage docks, IT operations bulk deployment and data migration devices, as well as multi-drive media synchronization scenarios for video production teams.

IV. Product Positioning: The Division of Roles Between the ASM2464PDX and ASM2464PD

Although the two are often confused, their hardware design objectives differ. The ASM2464PD focuses on NVMe SSD storage applications and is suitable for solutions prioritizing cost and integration, such as portable SSDs and single-drive enclosures; the ASM2464PDX, based on the same architecture, expands flexibility in PCIe lane configuration and compatibility with general-purpose devices, targeting docking stations and edge computing platforms that require external GPUs, AI accelerator cards, network cards, or concurrent multi-drive operation. The selection criteria can be summarized in one sentence: Choose the PD for pure storage, and choose the PDX for multi-device or general-purpose PCIe expansion. Additionally, the ASM2464PDX’s PCIe Gen4 x4 specification exceeds the PCIe Gen3 x4 requirements for device-side interfaces outlined in the Thunderbolt 4/3 standards, providing OEMs with room for performance differentiation.

V. Mingjiada Supply and Recycling Services

Supply Side. Mingjiada Electronics has long supplied brand-new, genuine ASMedia ASM2464PDX chips in stock, covering procurement cycles ranging from R&D prototyping and small-batch trial production to mass delivery. We serve customers in the storage devices, docking stations, AI edge computing, servers, and industrial control sectors. We also provide complementary ASMedia USB4/3.2 controllers and bridge chips, enabling customers to complete the procurement of both host-side and device-side chips on a single platform.

Recycling. Mingjiada offers long-term, high-price global buyback services for surplus and obsolete inventory of the ASM2464PDX and the full range of ASMedia chips, including factory surplus inventory, leftover materials from canceled projects, distributor excess inventory, and returned goods. Our buyback program is not limited to the ASM2464PDX model alone; we can simultaneously evaluate the inventory value of USB4/Thunderbolt-related chips such as the ASM2464PD and ASM4242, providing a two-way supply chain channel of “supply + buyback” to help customers liquidate idle inventory and reduce inventory capital tied up.