Kill all power to a PCI-e Grahpics Card?

The computer in question has two primary modes:

Mode A: (Working with web development, games, schoolwork)
Mode B: (Downloading/uploading files overnight, moving files on a local network)

Mode A actually requires a video feed to see what you're doing (kind of hard to play games while blind!) while Mode B is just set-it-and-forget-it busywork.

Is it at all possible for someone queue up a bit of tasks and then completely cut the power to the videocard? I'd like it to use as little juice as possible when I'm not actually using the machine.

In an effort to keep the power consumption (and thus heat) low, I'm just wondering if there is any effective way to make your GPU shutdown for the night. Someone correct me if I'm wrong, but even when you setup the power saving options in Windows, the card still is powered on, just not displaying a feed to the monitor, correct?

I sleep in the same room as the computer and any additional power/heat/cooling items translates into more noise when trying to catch some Z's. Any thoughts on this?

lower the clocks as much as possible then turn the fan down untill you cant hear it and the temps are still low.

Yeh, ive found it very simple, just go into atitool and hit new up the top left, then set your clocks and hit save.
Good luck