Yes you can use that PSU with that mobo. The 20+4 pin connector is a 20 or 24 pin connector. It is a 24 pin connector with a removable 4 pin clip.
I guess you want to have at least 30amps at +12volts, That PSU is 28amps at +12volts so I would look at a different one. It looks like that PSU comes with a extender for the main plug, I'm sure that's why it fits well in that case. You can simply buy a extender and put it on any PSU http://www.monarchcomputer.com/Merch...y_Code=CaseMod
I was recommended to a antec PSU by our friends here
My 430watt antec is 34amps at +12v. This 550watt antec is 38amps at +12v and nVIDIA SLI certified http://www.newegg.com/Product/Produc...82E16817103931