Make a three-part match
Start with the exact motherboard, its physical revision and the full CPU model. Open CPU support on the board page. Look for the processor's own entry instead of assuming that every processor using the same socket is supported.
Read the BIOS requirement
The support list may specify the BIOS version that first added support. Compare that requirement with the firmware currently installed on your PC. A newly purchased processor can fail to start on an older BIOS even when the board supports it after an update.
Plan the update before removing the old CPU
ASUS describes updating with an already supported processor, or using USB BIOS FlashBack on boards that offer it. Check whether your exact board supports a suitable update method and read that procedure. The presence of a USB port alone does not mean the board can update without a working CPU.
Keep these checks separate
- CPU support: will the firmware recognise this processor?
- Memory support: is the chosen kit and configuration suitable?
- Expansion support: does this CPU change PCIe or M.2 availability?
Use the specification footnotes as well as the compatibility list. If a required update cannot be completed with your available hardware, arrange that step before swapping the processor.
Original sources
- ASUS: new CPU compatibility and required BIOS ↗
- MSI MAG B550 TOMAHAWK: processor-dependent expansion support ↗
Source-linked editorial summary · Reviewed 2026-10-22 · Not hardware-tested