What motherboard suits Core 9 273PTE, and how should power delivery, memory, and ports be balanced?

  The 273PTE's nonstandard suffix doesn't identify socket, chipset, or DDR4/DDR5 by itself.

  Before buying, check the exact SKU, socket, chipset, memory type, BIOS, and VRM capability in the CPU and board support lists. Only if explicitly listed as LGA1851/800-series/DDR5 should you use B860 for stock or Z890 for expansion/high-power tuning; otherwise pick a board that lists the SKU, then trade GPU, M.2, USB, and networking needs.