Apple's refreshed M4 24-inch iMac sports a fast chip, but that isn't the only reason to upgrade. Here's how the hot new model compares to the year-old M3 iMac that it replaces.

While Apple is releasing a number of new M4-powered Macs this year, including the redesigned, smaller Mac Mini and the MacBook Pro M4, the Cupertino-company didn't forget about the MacBook Air.

Compared to the M3 chip, the M4 chip has an extra 3 billion transistors and more memory bandwidth, great for faster processing speeds. For most devices, it also has a higher max memory capacity than the M3 chip. The only exception here is the iPad Pro, which has a max memory capacity of 16GB due to its own limitations.