The Asus ROG Maximus Z890 Extreme uses an LGA 1851 socket paired with the Z890 chipset and adopts the E-ATX form factor, measuring 305 mm wide and 277 mm tall. It accommodates a single CPU and carries no integrated processor or integrated graphics. Wireless connectivity is extensive, covering Wi-Fi 4 through Wi-Fi 7 (802.11be) alongside Bluetooth 5.4, though aptX is not supported. Video output is handled via an HDMI 2.1 port, and the board includes RGB lighting for visual customization. Overclocking is facilitated through a dedicated easy-overclock feature, while dual BIOS and a straightforward CMOS reset option simplify firmware management and recovery. The board carries a 3-year warranty.
The board supports DDR5 memory across four slots in a dual-channel configuration, with a maximum capacity of 192GB. Overclocked RAM speeds can reach up to 8800 MHz, offering considerable headroom for performance tuning. ECC memory is not supported.
The rear I/O provides a solid USB lineup, including five USB 3.2 Gen 2 Type-A ports, two USB 3.2 Gen 2 Type-C ports, and one USB 3.2 Gen 2x2 Type-C port, while USB 3.2 Gen 1, USB 2.0, USB 4, Thunderbolt 3, and Thunderbolt 4 ports are absent. Video output is limited to a single HDMI port, with no DisplayPort, DVI, or VGA connectors present. Networking is covered by dual RJ45 ports, and there are no eSATA or PS/2 ports included.
Internal connectivity is well-provisioned, with six M.2 sockets and four SATA 3 connectors for storage, while SATA 2, U.2, and mSATA options are not available. Expansion headers include four USB 3.2 Gen 1 ports, four USB 3.0 ports, and four USB 2.0 ports, all accessible through add-in connections. Cooling is supported by six fan headers, and there is no TPM connector on the board.
Expansion slot support is centered on two PCIe 5.0 x16 slots, suitable for high-bandwidth add-in cards, complemented by a single PCIe x4 slot for additional expansion. There are no PCIe 4.0, 3.0, or 2.0 x16 slots, and no PCIe x1, PCIe x8, or legacy PCI slots are present on the board.
The onboard audio supports a 7.1-channel layout with a DAC signal-to-noise ratio of 120 dB, and two analog audio connectors are available for physical connections. An S/PDIF Out port is also present for digital audio output.
The board supports RAID 0, 1, 5, and 10 configurations, covering a practical range of performance and redundancy setups. RAID 0+1 is not supported.