I recently upgraded my backup unRAID machine from an i3-4360 to an i7-4770, so that both my machines could support virtualization.  I found a guy on craigslist that sold me the i7 for a whopping $150, including 16GB DDR3-1600.  Couldn't pass it up.  He also included the stock Dell cpu cooler that was originally on the cpu.  It had a loudish 80mm fan on it.  I didn't feel like spending $60 on a cooler for a cpu that I spent barely more than twice that for.  I noticed that the heatsink on the Dell cooler was larger than the 80mm fan attached to it.  Turns out the circular shaped heatsink was almost exactly 92mm in diameter, so I decided to just buy a Noctua NF-A9 PWM fan and "retro-fit" it onto that heatsink.  Worked out pretty well, and it's much quieter now.

 

 

 

Only the "before" picture works. 

Oops, thanks for the heads-up.  Should be fixed now.