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ASUS Z87 Pro Fan Problems

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May 11, 2011
Dallas - Ft Worth Area
Hello! I built a new PC a couple weeks ago and am having problems with fan readings. I'm looking at Monitor in the (updated) BIOS and System Info in AI Suite 3. I have not changed any default fan settings. No overclocking so far except for DRAM XMP. Here's what I'm getting: (Watch the front fan.)

Original Fan Configuration
Name Description RPM
CPU CPU cooler 740
CPUOpt Case top CM200mm 770
Fan1 Rear 120mm 1380
Fan2 Side 140mm 760
Fan3 not used
Fan4 Front CM200mm 495

Swapped fans connected to Fan2 and Fan4 to see if motherboard or fan was faulty.

Fan2 Front CM200mm 495
Fan3 not used
Fan4 Side 140mm 760

Hmm..., bad fan, right? Swapped front fan to Fan3 to verify bad fan.

Fan2 not used
Fan3 Front CM200mm 495
Fan4 Side 140mm 760

OK, bad fan. Bought a new one. I GET THE SAME RESULTS! How can this be?

Alright, the acid text. Set up original configuration then moved the case top 200mm fan (which had been reporting a good reading) to Fan4 and moved the front 200mm fan to CPU Opt.

CPUOpt Front CM200mm 770
Fan4 ===Case top CM200mm 510===

Now the front fan is reading OK and the top fan is reading bad. This is screwy. Any idea what's going on?

Thanks, - Dave

PC Build 19 Oct 2013
Motherboard ASUS Z87-Pro 1 PS2 BIOS 1405 8/19/2013
CPU Intel Core i7 4770K 3.5GHz Socket LGA 1150
CPU Cooler Cooler Master RR-212E-20PK-R2 Hyper 212 EVO
DRAM G.Skill F3-1600C9Q-32GXM Ripjaws X Series 32GB (4 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (XMT set in BIOS)
Drive0 (OS), Drive 2 (Apps) 2 ea. Corsair CSSD-N240GBGTXB-BK Neutron Series GTX 240GB SATA III Internal Solid State Drive (SSD)
Drive1 (Data) Seagate ST2000DX001 2TB MLC/8GB 7200 RPM 64MB Cache SATA 6.0Gb/s NCQ 3.5" Desktop Solid State Hybrid Drive
GPU ASUS GTX650TI-O-1GD5 GeForce GTX 650 Ti 1GB 128-bit GDDR5 PCI Express 3.0 x16 HDCP Ready
Driver 331.58-desktop-win8-win7-winvista-64bit-english-whql
PSU Rosewill TACHYON -750 750w Modular Active PFC Platinum 80
Blu-Ray Drive ASUS BW-14D1XT Black Blu-ray Burner SATA
O/S Microsoft Windows 7 Professional 64 bit OS all updates


Inactive Moderator
Dec 17, 2000
Portland, OR
Not really a direct response to your questions, but IMO your best bet would be to relocate all but the CPU fan to a separate fan controller connected directly to the PSU.