Used Kraken X60 at 25% fan speed (2x Stock NZXT 140mm Push) + Delidded and
lapped 3770K with Phobya HeGrease. 21C Ambient.
Differences between 25% and 55% (Fans pulse above that) are pretty minimal, about 2-4C. Above that it's another 1-3C gain and not worth it for noise. So far I've been pleased with 25% speed performance and I haven't fully tweaked the OC yet.
I might pickup some nicer 140mm fans, but honestly I'm cheap and these are doing a fantastic job so far at the noise levels that are good.
Been a long time since I really overclocked something. I think I've had about 24 BSOD's now. 3/4 of those to get 4700 stable, but only 1/4 to get what I hope 4800 stable. Bonus points for me staying within Intel's max spec'd voltages
*Worried what will happen when I decide to bump up my memory, I think the IMC on the chip is super sensitive, but I'm not 100% sure what is affecting what yet on OC stability.