"Modes" versus "Virtual" in xorg.conf

[peasthope@shaw.ca]

Folk,

Either of these in /etc/X11/xorg.conf will set the display resolution.

SubSection "Display"
	Depth      24
	Virtual 1280 960
EndSubSection
 
SubSection "Display"
	Depth      24
	Modes "1280x960"
EndSubSection

"Modes" is far more common that "Virtual" in cited xorg.conf examples.
Why?  Is this a matter of technical efficiency?  Is the Virtual setting just more 
recent than Modes?

Thanks,                         ... Peter E.

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