How to disable external VGA and also enable onboard VGA

hello,
 my spec is
cpu corei5 ivybridge
mis zh77A GA43
vga hd7770 msi
i want to know, how to disable external VGA and also enable onboard VGA ??
and
i want to ask too, if i disable external VGA In MB, it is my external VGA still consumption power? or i must unplug my external VGA ?
how much different power consumption between external VGA and onboard VGA on idle time?
because my computer each night be used for download, i want to save power as i can...
also there is a eco mode? i want to know about eco mode, how much power can be save under eco mode? on idle time computer
sorry my bad english

Well remove the HD7770 and is disabled and doesn't consume any power. You can't enable or disable it the discrete vga when pc is in use. That board does also not support Virtu.
The possible power saving beacuse of eco mode depends on the individual systems. There is no general value. Just try it. 

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