New AMD motherboards on the X870E chipset will be more expensive due to the ASMedia ASM4242 USB4 chip

New AMD motherboards on the X870E chipset will be more expensive due to the ASMedia ASM4242 USB4 chip


Bridge between PCI Express USP and two DisplayPort ports for two USB4 DFPs.
Integrated USB4 router with extended host controller, PCI Express switch and internal DisplayPort LTTPR/Non-LTTPR retimer.
Conforms to the Enhanced Host Controller Interface specification, revision 1.2.
GPIO, SPI and UART interface support.
Support I2C master buses for external power controller.
Firmware download via external ROM SPI.
External crystal oscillator 25 MHz.
Integrated controller of different broadband modulation.
The required voltage is 3.3V/1.8V/1.1V for normal operation and 3.3V/1.1V in standby mode.
Microsoft® Windows 11 driver support and various Linux™ kernels out of the box.
Compliance with industry specifications.
USB4 specification, version 1.0
USB 3.2 specification, revision 1.0
USB Type-C Cable and Connector Specification Release 2.0
VESA DisplayPort Alt Mode on USB Type-C, standard version 2.0
VESA DisplayPort (DP), standard version 1.4a
PCI Express Base Specification, Revision 4.0, Version 1.0
PCI Express Electromechanical Card Specification, Version 2.0
PCI Express Electromechanical Mini Card Specification, Version 1.2
PCI Bus Power Management Interface Specification, Revision 1.2
Local bus PCI revision 3.0

Features of Upstream PCI Express
Supports four PCIe Gen 4 lanes for the top port.
Maximum bandwidth up to 16 Gbps per line.
Support for PCI Express link power management.
Input 100 MHz.
Support for SRIS mode.
MSI/MSI-X support.

DisplayPort port specifications
Support for two DisplayPort ports.
Support for four DP interface lines per port.
Compliant with DP V1.4a.
HBR3 level support.
Supports a maximum bandwidth of up to 8.1 Gbps per line.
DP hot-plug support.

Downstream USB port characteristics
Support two USB4 DFP.
Support for multiple protocol tunneling including USB, DP, PCIe and host interface.
Support USB4/USB 3.2 power management.
Compatible with Thunderbolt 3 via USB4.
Supports alternate DP mode.
Support for USB 3.2 Gen 2×2 mode.
Support for multiple INs of USB 3.2 functions.
Support for USB 3.2 BOT and UAS protocols.
USB 3.2 transfer types support: control, block, stream, interrupt, isochronous.
Backward compatibility with legacy functionality and USB devices.
Remote remote/wakeup support.

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