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For the 80mm case fans we have selected the high quality and very reliable Noctua's versions. in this size range there is also the redux version(grey ones), a stripped down version with only the fan and 4 case screws an older bearing technology and different colors. Off course a bit cheaper than the regular version.
There is also the 3-pin and 4-pin version. The 4-pin version is with PWM. Our motherboards we sell have 4-pin headers, so please take the 4-pin version. With PWM the speed is automaticly adjusted. If you don't want to enable PWM take the 3-pin version. The fan will most likely always run at top speed.
Our advice. Take the Supermicro Motherboard and connect PWM case fans to Peripheral zone fan headers and let PWM control the fan speed based on the PCH temperature.
In this size range there is also the ULN(Ultra Low Noice) version available only 10,4 dB(A) !