mekunekud :
The Noctua is the best air cooler out there. If you can spare the extra $30 then go for it.
The Hyper 212+ is just an amazing cooler for the price and is fully capable of keeping a i7 cool at 4.2ghz.
Take into account that this also means you require a case with a fairly good airflow since no matter what cooler you use, if you have a bad case that doesnt circulate well, you will just blow warm air onto your CPU even with the best cooler.
I also hope that is farenheit because 90 celsius means you should clean your board, case and reset your chip since even on stock cooler that sounds too high for the Sandy Bridge chips, even underload.
Its definately Celsius i use both Real temp and Cpu temp, both can say 90c When under 100% load, for example stress testing using occt. I use the Sigma Windod storm, i have a rear top exhaust fan, and Two top Exhaust, unfortunately i dont have a side intake fan because the stock one has this loud hissing sound, so i need to replace that with probably a scythe or similar, and figure out a way to either put another side fan, or raise my computer and put a bottom intake.
I have a mid tower case, so i think it should fit, but im not so sure, the board/ cpu are verry clean, nearly no dust ( same with stock heatsink/fan) i installed it less than 2 months ago.
Also, as for the heat issue, right now my top exhaust fans have one of those sound dampeners above them, so i think thats also preventing the air to easily vent out., any suggestions on fan placement for maximum airflow, and silence?