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3.5. Display settings
Video memory size
This sets the size of the memory provided by the virtual graphics card available to the
guest, in MB. As with the main memory, the specified amount will be allocated from the
host's resident memory. Based on the amount of video memory, higher resolutions and color
depths may be available.

The GUI will show a warning if the amount of video memory is too small to be able to
switch the VM into full screen mode. The minimum value depends on the number of virtual
monitors, the screen resolution and the color depth of the host display as well as of the
activation of 3D acceleration and 2D video acceleration. A rough estimate is (color depth
/ 8) x vertical pixels x horizontal pixels x number of screens = number of bytes. Like
said above, there might be extra memory required for any activated display acceleration
setting.

Monitor count
With this setting VirtualBox can provide more than one virtual monitor to a virtual
machine. If a guest operating system (such as Windows) supports multiple attached
monitors, VirtualBox can pretend that multiple virtual monitors are present.[15] Up to 8
such virtual monitors are supported.

The output of the multiple monitors will be displayed on the host in multiple VM windows
which are running side by side.

However, in full screen and seamless mode, they will use the available physical monitors
attached to the host. As a result, for full screen and seamless modes to work with
multiple monitors, you will need at least as many physical monitors as you have virtual
monitors configured, or VirtualBox will report an error. You can configure the
relationship between guest and host monitors using the view menu by pressing Host key +
Home when you are in full screen or seamless mode.

Please see Chapter 14, Known limitations also.

Enable 3D acceleration
If a virtual machine has Guest Additions installed, you can select here whether the guest
should support accelerated 3D graphics. Please refer to Section 4.4.1, “Hardware 3D
acceleration (OpenGL and Direct3D 8/9)” for details.

Enable 2D video acceleration
If a virtual machine with Microsoft Windows has Guest Additions installed, you can select
here whether the guest should support accelerated 2D video graphics. Please refer to
Section 4.4.2, “Hardware 2D video acceleration for Windows guests” for details.
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