FWIW, I wasn't very happy with the 212+ on my 2500K, I bought another (identical) fan and ran it as a dual setup but it may have only had a 1-2C difference.
Last week I used duct and black electrical tape to seal the edges around the fans... there is a huge gap between the fans and the actual heat exchanger on the 212+, I really think it blows more air out the sides than it does through the fins of the exchanger. As it turned out, my temps dropped 5-6C with the new taped-up push-pull fan setup (in LinX testing.) It's not very pretty, but it's working for me until I can upgrade the cooling or replace the CPU/mobo altogether.
Just food for thought...