Question about this stock Haswell cooler.. What kind of behavior are you guys seeing with 3-pin vs 4-pin drive?
With 4-pin (PWM), the usable range is about 1000 to 2000rpm; this is fine for AV use but it will only support a very modest overclock.
With 3-pin, the usable range is about 1800 to 3000rpm; this allows for a moderate overclock but it's too noisy for day-to-day use. If I set the fan control under about 80%, the fan stops spinning altogether. It seems impossible to get a slow spin without PWM control.
Should I blame my board or would a different fan give more flexibility?
edit: I just plugged-in my old OCZ LGA775 cooler fan. It can go from almost zero to about 2500rpm in 4-pin mode and up to 2100rpm in 3-pin mode. This is better, but I still think ASUS AI Suite is craptastic.
edit2: Just found this in the Intel thermal guide linked above:
This explains why the motherboard's 3-pin mode is acting funny... It's interfering with the fan's own temp control mechanism.Edited by richard612 - 6/23/13 at 6:14am