Well, unless you are doing AutoCAD or Maya, you shouldn't need over 2GB of ram. Running it in dual channel will significantly increase the potential bandwidth. It may help considerably, or it may just help a little bit.
Wow!!!!!!!!!!!!!
What a great computer you have there.
You must be a lucky one, who can build a computer with all that high end hardware.
It will be great if your motherboard support for dualchannel memory.