Thermalright Ultra-120 is one of the best, if not the best air cooler. It is very expensive though at £35 and then you need to put a fan on it.
AC Fan 12 PWM is the best 120mm fan for 120mm CPU cooler duty as it's a 4-pin High Frequency PWM fan and it can be properly controlled from the BIOS.
Alternatively Yate Loon 120mm are the quietest real-world noise fans.
It is impossible to compare fan cfm and dBA specifications as they are all measured in different ways. dBA means nothing without a distance - it should be quoted as "dBA at 1m" as an example. Fan CFM figures also mean nothing unless the resistance is quoted. The Noctuas are very quiet but they have a very low air pressure so they don't push the air, but they don't push it very hard so the air speed is low and less effective.
SilenX quote some mental figures, but the LED ones are rubbish in the real world.
Arctic Cooling, Acoustifan, Yate-Loon (Panaflo) are all very good compromise fans in that they are properly quiet and push a respectable amount air quite hard. Akasa Ambers have a good reputation but the quality is a bit variable and some are better than others. Noctuas are extremely quiet but as I said before they have a problem pushing hard enough to be effective. Scythe S-Flex are said to be a decent fan, but I have no experience of those.
AC Fan 12 PWM is the best 120mm fan for 120mm CPU cooler duty as it's a 4-pin High Frequency PWM fan and it can be properly controlled from the BIOS.
Alternatively Yate Loon 120mm are the quietest real-world noise fans.
It is impossible to compare fan cfm and dBA specifications as they are all measured in different ways. dBA means nothing without a distance - it should be quoted as "dBA at 1m" as an example. Fan CFM figures also mean nothing unless the resistance is quoted. The Noctuas are very quiet but they have a very low air pressure so they don't push the air, but they don't push it very hard so the air speed is low and less effective.
SilenX quote some mental figures, but the LED ones are rubbish in the real world.
Arctic Cooling, Acoustifan, Yate-Loon (Panaflo) are all very good compromise fans in that they are properly quiet and push a respectable amount air quite hard. Akasa Ambers have a good reputation but the quality is a bit variable and some are better than others. Noctuas are extremely quiet but as I said before they have a problem pushing hard enough to be effective. Scythe S-Flex are said to be a decent fan, but I have no experience of those.