Through several research in Internet forums I bought these recommended Corsaire Vengeance Black 8GB (2x4GB) DDR3 1600 MHz (PC3 12800) for my Asrock Z77 Extreme4 motherboard. Easily in the BIOS of the motherboard has the XMP profile and may be manually set to 1600 MHz. Everything runs smoothly and is properly recognized under CPUz.
I am much in Internet forums on the go and can say that most people with DDR3 compatible motherboards with these bars have no problems. They are great and available for modders in other colors.