A technician is asked to make recommendations for purchase of new server hardware in a datacenter. Currently the datacenter is extremely limited in power available for new hardware, so the…

ARM (Advanced RISC Machine) architecture was engineered from the ground up to minimize power draw while sustaining useful compute performance, and modern server-grade ARM SoCs such as Ampere Altra and AWS Graviton operate at significantly lower TDP than comparable x86/x64 processors. This makes ARM the clear choice when power budget is the primary constraint for new server hardware purchases.

x64 is the 64-bit extension of the x86 instruction set used by Intel and AMD; these processors are optimized for raw throughput and carry substantially higher TDP ratings, making them poor choices in power-constrained environments.

x86 is the traditional 32-bit Intel/AMD architecture which consumes more power than ARM and lacks the power-efficiency optimizations needed for a power-limited datacenter expansion.

RISC is a processor design philosophy, not a specific purchasable architecture; ARM is itself a RISC implementation, so selecting 'RISC' is too vague to identify a real product line and provides no actionable procurement recommendation.