When sourcing CPU sockets, the most critical factor is socket architecture compatibility (e.g., LGA, PGA, or BGA) and specific pin counts like LGA 1700, AM4, or AM5. You must verify the pitch size (distance between pins) and contact resistance, which should typically be less than 30mΩ to ensure signal integrity. Additionally, for high-performance computing, ensure the socket supports the required TDP (Thermal Design Power) and has a high insertion cycle rating (usually 50-100 cycles for test sockets) to guarantee longevity.