Summary: Have the no-fan version running in a full-size ATX Coolermaster case since 2007. You do need plenty of clearance from the MB to the edge of the case. I wanted a noiseless solution. CPU runs at 45 deg C worst case. However, i don't think this (no fan) version would be good for modern system.
Summary: This cooling fan only came with hardware that would work for a socket 2011. The mounting instructions indicate it should have had more hardware. I was forced to go to a local hardware store and purchase 4 3mm screws to be able to mount the cooling fan correctly. Once installed however it has functioned well, keeping my processor running about 32 degrees. Not sure the additional headache and worry off set the lower price tag however.
Summary: Mixed feeling on this one, I found it a little difficult to get mounting into my case especially up at the top rear corner. I did end up trashing it eventually because it was a hastle to take out and put back in.
Summary: This fan outperforms its' price tag. It's a solid design that runs efficiently and quietly. I used a LGA 775 specific model of this fan for 3 years in a gaming PC and it worked great. I only had to replace it because I let dust build up in the case. As a note to that, don't buy this fan as a replacement unless you are willing to take your motherboard out of the case. Great for an initial build on a budget.
Summary: First off, don't be intimidated by the installation process. It looks complicated, but if you read the instructions first and use all the parts included then it becomes very simple. Yes, you must remove the motherboard to mount the bottom bracket. But this was a new build, so the motherboard was already off for me. It's not that hard to take off your motherboard, just tedious, but let's not be lazy folks, some things take a little effort.
Summary: Great bang for the buck. Using it with a Q9550 quad core and running windows 8 developer preview and it's keeps the core temp at 37c. So I'm happy, I'm going to overclock so we'll see how it handles that.
Summary: Had the older version of this CPU fan and it lasted 3 years before the bearings went and it started making a cricket noise. Decided to get the same one because I knew it would fit and I'm probably going to rebuild in less than 3 years anyway. Overall for the price this is a great fan, keeps cpu cool and it's quiet.
Summary: worked great for me and in a case that would not fit a 120mm fan and heat sink. It was a little noisy and I ordered a nactua fan to quiet it down. was bench testing it and on ;the board it was quiet. by the time the new fan came it was running very quiet. Im running at 86f on boot up. So it is doing the job for a small single fan cooler. It should take a reasonable amount of oc. I dont know if id want to take it up 30%.