I have a corsair h80i in my pc and I have my i7-3820 overclocked from 3.6ghz to 4.3ghz. My cpu core temps go to a maximum of 65°c when the cpu is running at max load. I usually have the software set to balanced mode and it is pretty quiet. I always run hwmonitor at startup so I can monitor my temps and it has never went over 65°c. I would definitely recommend the h80i especially if you are looking for a great and affordable cooler, but if you have the space go for the h100i. The fans it comes with are very good, so no need to purchase extra fans unless you want better air flow or a quieter cooler.