Do NOT connect any fan to the CPU_OPT header. Now, IF you have only ONE fan on the CPU, and FOUR cooling the case generally, then make one small change. The CHA_FAN header design actually only operates in the older DC Mode, so that's fine for your fans.

Note that for these three headers you do NOT have an option to set DC Mode. For EACH, set:Ĭhassis Fan n QFan Source to MB to use the motherboard temp sensor for guidanceĬhassis Fan n QFan Profile to Standard (normal automatic fan speed control)Īllow Fan Stop to Disabled so the fan never stops completely Then, for the THREE fans used for case ventilation, see p. 2-38) configure EACH this way:ĬPU Q-Fan Control to DC Mode (suited to 3-pin fans)ĬPU Fan Profile to Standard (normal automatic fan speed control) Those two should be connected to the CPU_FAN and CPU_OPT headers. We'll start assuming you have TWO fans cooling your CPU. However, if only one is for the CPU and you have FOUR for case vent, then there's a slight change to make. IF you have TWO of those on the CPU and the other 3 on case vent, this is easy. You have five fans in total, all of the 3-pin design, according to your posts above. There choose the option to Save Changes and Reset. When you have them all configured, you use the Esc key to get back to Main Menu, then click on Exit on the top menu bar to get to the Exit Menu (p.2-48).

2-37)) you need to select each of the FIVE fan headers and configure each in turn separately. 2-8), then use F6 to get to Q-Fan Tuning (p. 2-6 to get there, use the F7 key to get to Advanced Mode (p. Next, recognize that, in BIOS Setup (see your manual, p. The second group are those used to cool the case interior, and these should all be connected to mobo CHA_FAN headers, of which you have three. All the fans in this group must be connected to the CPU_FAN or CPU_OPT headers, because those two use as their guide a temperature sensor built into the CPU chip. The FIRST is the fan(s) used to cool the CPU, whether that's just one, or two. First, you should understand that there are two fundamentally different fan groups.

Asus motherboard cpu fan control