Underclocking graphics card in a Linux Server

I recently built myself a new Linux Server with a Core 2 Duo 1,83 GHz CPU and a nVidia GeForce 7200LE graphics card, which was the cheapest passively cooled card I could find. I've measured power draw of the system and it seems to draw about 95 Watts.

The graphics card seems to generate quite a bit of heat though, I don't even have a monitor, mouse or keyboard connected to the machine so this seems quite unnecessary.

Can I underclock or even power down the graphics card somehow to conserve energy?

Update: After removing the graphics card and undervolting the CPU from 1.25V to 1.1V (seems stable), power usage has dropped to 70 Watts. Thanks everyone.

Solution 1:

There is a tool called nvclock which can adjust the clock for Nvidia cards.

It only works if you use the proprietary nvidia driver.

There is a debian/ubuntu package called nvclock and GUIs for KDE nvclock-qt and GNOME nvclock-gtk.