![]() Power related settings are controlled through SMC. NVRAM is responsible for speaker volume, screen resolution, startup disk selection, and time zone information. New Macs don't come with PRAM, instead, they include NVRAM which performs similar functions. They are responsible for storing and processing of important startup functions in an iMac, MacBook Air & Mac Pro. SMC (System Management Controller), NVRAM (Non-volatile Random Access Memory), and PRAM (Parameter Random Access Memory) are essential components of any Mac desktop or laptop computer.
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