The 12 (special edition with 140 mm fan) has fins that touch the headsink base (a plus, me thinks), and 1 fan. The C14 has 2 fans (that leave less space for my HyperX RAM with tall headsinks), but I might run it with just 1 fan (remove lower fan). Price difference about 20 euros. The 14 gets better reviews, apparently, at overclocked, 4000 Mhz, CPUs. Why? Well, as of late, my i5 750 gets beyond 80 degrees Celcius during benching a 4K, and even when gaming. Dust may have reduced my systems cooling a bit. B ut I know my Artic Cooling HSF is not top notch. More headroom with a Noctua. Or should I just get the D14 (tower with 2 fans)? Thanks a lot!