omg please tell me i didnt order the wrong thing for my first build.

If you look up the mobo spec - http://www.gigabyte.com.au/products/product-page.aspx?pid=4591#sp - you'll see it says -
" Memory
4 x 1.5V DDR3 DIMM sockets supporting up to 32 GB of system memory
* Due to a Windows 32-bit operating system limitation, when more than 4 GB of physical memory is installed, the actual memory size displayed will be less than the size of the physical memory installed.
Dual channel memory architecture
Support for DDR3 2000(O.C.)/1866/1600/1333/1066 MHz memory modules
* To support a DDR3 1866 MHz (and above) memory, you must install an AM3+ CPU first.
(Please refer "Memory Support List" for more information.)"