Lexi Konz-1364417 :
First: which is better, active cooling or passive???
It really depends on what you are trying to cool. Memory modules, your motherboards northbridge and southbridge chipsets and some power supplies and video cards can be passively cooled, while most high end components such as CPUs, high end video cards and high wattage power supplies need to be actively cooled. They create far too much heat to be cooled by any other means.
Lexi Konz-1364417 :
Second: which is the best cooler (active or passive) for AMD FX-8350???
Again that's a very subjective question.
The best way to cool an FX-8350 would be a custom water cooling loop. Nothing else will keep your CPU as cool.
The best budget air cooler would be the
CoolerMaster Hyper 212 EVO
There are a lot of opinions about which Air cooler is the best. Some feel the
Noctua NH-D14 is the Best. Others feel the
Phanteks PH-TC14PE is the best. You will get a wide array of answers to those questions.
Personally I like the Hyper 212 EVO. I want good cooling performance but I don't like spending money, so that solution is perfect for me.
In todays world of power hungry components and high clock speeds, active cooling is a must.