Selecting the correct architecture depends on the end-user application. For high-performance workstations, prioritize CPUs with high core counts (8+ cores) and large L3 cache (e.g., Intel Core i7/i9 or AMD Ryzen 7/9). For ultrabooks and mobile office use, focus on TDP (Thermal Design Power) efficiency, typically looking for processors in the 15W-28W range to ensure long battery life and minimal heat throttling. Always verify the socket compatibility (BGA vs. LGA); most modern laptop CPUs are BGA (Ball Grid Array), meaning they are soldered to the motherboard and cannot be replaced individually.