26db isn't "terrible", but I can tell you that those AF120 fans do not actually have a maximum 26db at full speed. They are louder than they would like you to believe however they are still better than a lot of fans out there for the price.
Those AF120 three pack fans are three pin models however, and that board does not have the ability to run 3 pin DC controlled fans off of it's PWM system fan headers so you will either need a case integrated or aftermarket fan hub that is capable of handling those three pin DC fans while connecting to a motherboard PWM header, or an aftermarket controller like the NZXT Grid v3. Phanteks has a couple of pretty good controllers as well.
Honestly, you'd be better off simply buying PWM fans to start...