NVRAM can keep the information even if the computer isn't powered. But they use different mechanisms to store data and for different uses. NVRAM and RAM (Random-Access Memory) both are forms of computer memory. It is mainly used for data storage and data transfer between a computer and digital devices. It is used to keep or enhance the performance of the Mac machine.įlash memory is a type of EEPROM (electronically erasable programmable read-only memory). NVRAM stores OS-related information to allow the Mac computer to run normally. NVRAM and flash memory are both non-volatile memory and can store data when the power is off. You can check them in System Preferences. Or, commonly, after resetting NVRAM, your sound volume, screen resolution, and time zone will back to default settings. See the Apple logo appears and disappear the second time on a Mac with an Apple T2 chip.Hear the startup chime a second time after pressing the resetting shortcut key.Here are the common scenarios when you need to reset NVRAM/PRAM: That's the reason why you need to reset NVRAM when your Mac doesn't work well. If the stored information in this random-access memory goes out of control, your Mac might run improperly. When should you reset NVRAM/PARAM?Īs mentioned above, NVRAM/PARM contains your Mac's state configurations. Modern Mac computers no longer use PRAM but use NVRAM instead. But usually, the settings are related to startup disk selection, recent kernel panic, display resolution, sound volume, and time zone.Īnd it's worth noting that NVRAM is the updated Mac terminology for PRAM (Parameter random-access memory). The setting information stored in NVRAM varies from your Mac model and its connected devices. It is a small amount of memory in Mac, where the OS-related settings are stored to enable your computer to start up quickly and perform properly. The full name of NVRAM is Non-volatile random-access memory. And then, you'll be clear about when you should use it and how to reset it on Intel-based and M1 Macs. But what does resetting NVRAM do? This post will help you learn NVRAM comprehensively. The most common suggestion for troubleshooting your misbehaving Mac is to reset NVRAM.
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