That's slightly like asking what part of the car makes the car go forward. The motor, sure. But the motor itself is comprised of many different parts that are required. A video card has two 'key' parts:
1) GPU, which is the graphics processor.
2) VRAM/Page Buffer/Memory, where the stuff is stored.
As for the part, it would be the GPU that is doing it but there are many things which are required for these to work. The voltage regulators, the heatsink/fans. Then you have the crossfire support and a few other things. Some cards have extra stuff as well. nVidia (at least used to) have a separate chip for sending the graphics signal to the monitor. These chips were third party made, and as such you could get a difference in picture quality between different brands of the same type of chip. Whereas ATI has that built directly onto the GPU these days so all ATI cards of the same model have pretty much the exact same picture quality.|||The video card is the component. The card can interface with your motherboard via AGP or PCI Express. Your monitor interfaces via VGA, DVI, S-video cables.
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