Summary: Works awesome! Keeps my temps well within tolerance. Sorry, fellow shoppers, I don't have numbers to share but plenty of internet sites do. My former processor (coupled with a Xigmatek cooler) was a pretty swell deal, but this cooler is quieter and I have less random shutdowns. In case you're wondering I have an i7-5820k. No overclocking yet, but the cooler has given me no complaints. Cracking into the manual initially, I thought it would be a tough install.
Summary: I have a AMD A10 5800k with 8 GB RAM in a ATX Mid tower, i live in Central America the weather are dry and dusty with 30C-36C temperature, no AC in my room only a fan, my pc with cpu fan I achieved temperatures of 45C(idle)-60C, 60C when i playing mmorpg's. With this I now achieve temperatures of 33C-41C(max). Thats a huge change, first time using liquid cpu cooler, easy to install, is not really noise. I highly recommend this cooler. Great price for you got.
Summary: My system came with a defective CPU cooler and would hit 103C regularly. Far too hot. I ordered this H55 and installed it myself in about an hour. WOW! My Intel Quad Core i5 now hums along beautifully at 37C even under extreme loads. This Corsair H55 is worth it's weight in gold in saved productivity, and saved processor life.
Summary: So much better than the noisy cooler that came with my AMD 8350. The fan is quiet and CPU stays around 32 deg C for average CPU load. My case didn't have room for 120mm fan so I had to do some sheet metal work to make it fit.
Summary: Works great. No more warnings of CPU heat. Hard to install the back plate if following the instructions and using the same holes as marked. Forums helped to give confidence that eventually the screws would line up to mount the device.
Summary: Put an AMD 8350 under full load with multitasking video converting, and running a few HD videos at once. Performance was flawless and core temps never exceeded 43 degrees C. Not bad cooling compared to 70+C with air cooling. Also the H55 runs quiet which is nice after the old fan thermal exchange sometimes sounded like a jet engine.