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⚡ Engineering Highlights at a Glance:

• AMD AM4 Socket: Works with Ryzen 5000 Series, 4000 G-Series, and 3000 Series desktop processors.
• PCIe 4.0 x16: The main graphics slot runs PCIe 4.0 on Ryzen 5000/3000 chips, doubling bandwidth over PCIe 3.0.
• 4 x DDR4 DIMM Slots: Supports up to 128GB dual-channel memory with OptiMem II trace routing up to 4600 MHz (OC).
• Dual M.2 with Heatsink: One PCIe 4.0 x4 M.2 slot and one PCIe 3.0 x4 M.2 slot, with an aluminum heatsink on M.2_1.
• Intel 2.5Gb Ethernet: I225-V controller with ASUS LANGuard for faster wired networking.
• ROG SupremeFX S1220A Audio: Dual OP amplifiers, gold-plated jacks, and 120 dB SNR stereo playback.
• Aura Sync and BIOS FlashBack: Two Aura RGB headers, one addressable Gen 2 header, and BIOS FlashBack button for updates without a CPU.

CPU Compatibility and PCIe Generation

The B550 chipset supports AMD Ryzen 3000, 4000 G-Series, and 5000 Series processors on the AM4 socket; Ryzen 1000 and 2000 Series are not compatible. PCIe 4.0 x16 on the main slot and PCIe 4.0 x4 on the M.2_1 slot only work with Ryzen 5000/3000 (non-G) processors. With Ryzen 4000 G-Series APUs, the main PCIe slot and M.2_1 run at PCIe 3.0 speeds instead. Verify your CPU choice against the ASUS CPU support list before purchase.

Memory and M.2 Population

Install memory in slots A2 and B2 first for dual-channel operation. The board supports up to 128GB across four DIMM slots, with OptiMem II trace routing for better signal integrity at high frequencies. The M.2_1 slot (PCIe 4.0 x4 with heatsink) sits under the chipset heatsink near the CPU; the M.2_2 slot (PCIe 3.0 x4) sits lower. On Ryzen 4000 G-Series chips, both M.2 slots run at PCIe 3.0. Note that the M.2_2 slot and SATA ports 5 and 6 share bandwidth; check the manual before populating all storage at once.

Power, USB, and Clearance

The board uses a 24-pin EATX main connector plus an 8-pin and a 4-pin ATX 12V CPU connector; connect both CPU power cables for stable power delivery on high-core-count Ryzen chips. The rear I/O provides two USB 3.2 Gen 2 ports (one Type-A and one Type-C), four USB 3.2 Gen 1, and two USB 2.0. Internal headers add two USB 3.2 Gen 1 and four USB 2.0 ports. The ATX form factor measures 30.5 x 24.4 cm and fits standard ATX mid-tower cases; check CPU cooler height and top radiator clearance if you use a large air cooler or 280mm AIO. BIOS FlashBack on the rear I/O lets you update the BIOS without a CPU installed, which helps if the board ships with a BIOS older than your Ryzen 5000 chip.

Pair this board with a Ryzen 5 5600, Ryzen 7 5700X, or Ryzen 7 5800X3D for the best balance of PCIe 4.0 support and gaming performance. Because PCIe 4.0 only works on Ryzen 5000/3000 (non-G) chips, choose a non-APU processor if you plan to use a PCIe 4.0 NVMe SSD.

Install memory in slots A2 and B2 first for dual-channel operation. For a 3600 MHz kit, enable DOCP in the BIOS to run the rated speed; without DOCP, memory defaults to 2133 MHz. Because M.2_2 and SATA ports 5 and 6 share bandwidth, plan your storage layout before you install drives.

Before you install the CPU, check the BIOS revision. If the board ships with a BIOS older than your Ryzen 5000 chip, use the BIOS FlashBack button on the rear I/O to update without a CPU installed. Also, connect both the 8-pin and 4-pin CPU power cables for stable power delivery on high-core-count Ryzen chips.

Use the AIO_PUMP header for liquid cooler pumps, and the CPU_FAN and CPU_OPT headers for a dual-fan tower cooler or AIO radiator fans. Enable Aura Sync in Armoury Crate to sync the two RGB headers and one addressable Gen 2 header with your other ASUS peripherals. Because the board has a pre-mounted I/O shield and Q-LED indicators, the build process is simpler for first-timers; if POST fails, check the Q-LED color to identify whether the issue is CPU, DRAM, VGA, or boot device.