SMBus devices are supported by FreeBSD, OpenBSD, NetBSD, DragonFly BSD, Linux, Windows 2000 and newer and Windows CE. This article describes some of the commonly used features of Activity Monitor, a kind of task manager that allows you see how apps and other processes are affecting your CPU, memory, energy, disk, and network usage. Activity Monitor shows the processes that are running on your Mac, so you can manage them and see how they affect your Mac's activity and performance. Make sure that the Mirror Displays checkbox isn’t selected. ![]() ![]() Choose Apple () menu System Preferences, then click Displays. Use external monitors with your Mac - Use extended desktop mode Make sure that your external display is powered on and connected to your Mac. ![]() ![]() When you shop for a monitor, pay attention to the type of connector that comes bundled with the monitor. OS X suggests a “default” resolution of a Retina-scaled 1920×1080 equivalent, and we have the choice to set other resolutions ranging from an equivalent of 1504×846 to the full 3840×2160. For example, the external monitor connected to our Mac in the screenshots is a 27-inch Dell P2715Q 4K monitor, with a native resolution of 3840×2160.
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