Your nvidia GeForce4 (shadows) model MX440-8X, should run at 0.8 volts. A 4X card will run at 1.5Volts. It's only when you drop to 2X or 1X that it usually runs at 3.3volts.
You can check a card by looking at the gold slots. If, looking from the locking tab, you have a key (notch) a third of the way across, it is 0.8 to 1.5 v. If the key ( notch ) is two thirds of the way across it is 3.3v. This way you cannot put the wrong speed of graphics card into the wrong motherboard.
Just to clarify the key ( notch ) is farthest away from the monitor connection.