Newegg.com - Kingston HyperX Blu 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 Desktop Memory Model KHX1333C9D3B1K2/4G
Supported RAM (Registered or Buffered): Unbuffered
Supported RAM Integrity Check: Non-ECC
Supported RAM Speed: 1066 MHz , 1333 MHz , 1600 MHz , 1866 MHz
Supported RAM Standard: PC3-10600 , PC3-12800 , PC3-14400 , PC3-8500
Supported RAM Technology: DDR3 SDRAM
Make sure the ram you get is "NOT ECC buffered" type ram.
Mind is mostly correct, but not all types of ram fly well with asus mobo's, asus had a good reason for stating that for AM3+.