Hi there I currently have 2X pure wing 2 140mm, 3x arctic p14 140mm and 3x Dynamic X2 GP-14 Fractal 140mm (that came with my Fractal case). one of my arctics fan just broke i was looking to replace it. i was wondering if it is worth it to change all the non be quiets to the silent wings 4 because they are on sale near me for $20 each or if the fractal and arctic are more then fine.