Welcome to the forums..The 750 G2 comes with two CPU power cables with 4+4 pin connectors on the motherboard end and would be a good choice providing it meets the system's overall wattage requirement..You can use the OuterVision Power Supply Calculator or the EVGA Power Meter to estimate your system's overall wattage requirement..If you did not know it and use the EVGA Power Meter, you'll recieve a 10% off discount code in your email just for using it..It's a one-time discount good for 30 days and only in the EVGA U.S. shopping cart.
 
The 4+4 pin connector is electrically an 8 pin connector split in half..An 8 pin motherboard socket takes both halves..A 4 pin motherboard socket takes only one half of a 4+4 pin connector, with the other half hanging.
 
The reason for 4+4 pin connectors is for better compatibility across various motherboard designs..Some motherboards only have one 4 pin socket, some have an 8 pin socket, some (like yours) have an 8 pin and a 4 pin, still others have two 8 pin sockets..Motherboards with 8 pin or more sockets provide more current and stability for higher wattage CPUs and overclocking.
 
You don't need to use the 4 pin unless extreme overclocking or stability issues arise, only the 8 pin..Scroll down to "Stripping the X99-A II" here..Motherboard manuals can sometimes be confusing and with omissions..Sometimes parts of them have "cookie cutter" information they copy/paste from other manuals..Attached images are the ATX Power connections for an X99 Deluxe and an X99-A II, for example.
 

 

Yep..Exactly right.

Limiter_1
About the evga power meter, is it free? I had to check before coicking the link just in case. ;)

Yep.

Use the OuterVision calculator, it's more detailed and you can put in your GPU clock speed and overvoltage, just rough guess it.
 
Depending on the region you order the PSU from will determine what type wall socket plug you get..You won't get a European plug if you order in the US/Canada region, and vice-versa, you get the cord/plug from the region you order it from..EVGA (and the vast majority of others) PSUs will work in any voltage region..They either detect and auto-switch to the correct input voltage, or there's a manual switch you must be sure is in the right position before plugging it in/turning it on..If it's manually switched and in the incorrect position, a popping noise will promptly be heard associated with a cloud smoke, you can trust me on that one
 
On the sticker of PSUs it tells you what the AC Input voltage range is..As in the snip attached below, it's rated from 100 - 240 volts AC..Some el cheapo units are only 110 volt..Some are only 220 volt..But like I said the overwhelming and vast majority of PSUs today will auto-detect the input voltage..You can go to the EVGA Products Page to find out more.