Help me to know the deference between this gigabyte boards please

hello ,
i got 5 gigabyte motherboards on that link

http://www.newegg.com/Product/Prod [...] X58&Page=1

so the all 5 boards for the cpu Core i7 , but i need to know the deference between those 5 boards please because i dont know a lot about the boards ,so i wanna know more like

like on the link the all 5 boards have FSB : QPI 6.4GT/S , South Bridge: Intel ICH10R and Channel Supported: Triple Channel .

so what is the meanning of the FSB , the South Bridge and the Channel Supported ? .

and what is the meaning of the PCI Express 2.0 x16 and the PCI Express x4 ??

because the value of those 2 things is the different thing between the 5 boards and i don't know the meaning for them .

so please help me to know the meaning of those things to understand more and please tell me the different between the 5 boards that makes one boards cost is very expensive and the other not so much expensive in the case of the all boards for the cpu Core i7

thanks

thanks i got the Definitions from google and now i know the meaning of pci express too (the computer expansion card )

i guess the PCI Express 2.0 x16 is the main thing that make deference between the all boards like the most expensive one GA-EX58-EXTREME have 4 PCI Express , 3 x 2.0 x16 (x16, x16, x8) and other one PCI Express x4

and the GA-EX58-UD4P LGA have only 2 PCI Express ,2 x (x16) ,one running at x16 and the other running at x8

i wish i got the right info and i will be welcome with any comments or any addition info

thanks

Since you didn't give a budget I am just going to assume money is a object.

GIGABYTE GA-EX58-UD4P in my opinion is the best choice. With the UD5 your basically just paying for the extra PCI Express 2.0 x16. Its doubtful that you will buy 3 videocards and its also really not worth it even if you did.