Both are the same price.
Both have the same clock speed (1600 MHz).
Both are DDR3 RAM.
Both are compatible with the motherboard:
AMD Phenom II X6 6-Core CPU ready, AMD 890GX/SB850 chipset, dual-channel, DDR3 1800(OC) support
The only difference is that the Ripjaws have a better heat spreader, and has a lower voltage.
Go for the Ripjaws.