Installing the Corsair A70 is as easy as it can be (considering, of couse, that your case has a hole in the motherboard tray, allowing you to access the solder side of the motherboard, otherwise you must remove the motherboard from the case). Before installing the cooler, you need to attach an H-shaped clip to its base. In Figure 10, you can check this clip in place and the backplate used with Intel CPUs.
After installing the clips, put the backplate on the solder side of the motherboard, put the cooler in place and fasten the four thumbnuts.
After that, just attach the fans to the heatsink and connect them to the motherboard.