Motherboards/graphics card

[saint_hades]

Hi
I was wondering if different motherboards change the speed of the computer.
Like a more expensive motherboard, with lets say with a Quad core in it, is it going to be faster than a cheaper motherboard, with the same processor.

I know that some motherboards can't have some processors on them, like a old motherboard you can't install a new processor on in.

and is PCI slots for newer graphics cards?

thanks

[soybean]

and is PCI slots for newer graphics cards?

No, PCI Express slots are for newer graphics cards. 

I'll let somebody else answer the question on motherboards.