I also have the Asus M5A97 R2.0 board, and I'm trying to use SpeedFan version 4.49 (the latest) to control fan speeds. motherboard temps down by about 10c, cpu down almost 10c while playing bf3 (my "under load") and GPU is down almost 10c while playing as well. I will say this is a huge improvement over the stock 3 fans. A, get this issue resolved and have it run the way I originally intended, B, simply purchase an extension or make one out of the splitter to get the bottom chassis fan on the header and have the fronts cpu speed based and the others chassis speed based, or gang them all on the cpu speed signal to make use of the lower 20% setting. I'd just plug it directly but the cable is too short. For now I have the CPU and two front fans on the CPU header via one of the splitters and the rear fan on header 1, top fan on header 2 and the bottom fan is on the splitter via header 3 but it's on at 100%. While looking into it last night I also found out that the Asus minimum speed on chassis fans on manual mode in the bios is 60% which seems to be a standard or some sort, which is really not low enough at all. When I plug the fans directly to the mobo chassis fan headers, the speed is controlled but I'm not sure if it's varied voltage or pwm. I checked bios and FanXpert to try to find a way to select voltage control or pwm control but could not.
If I use one of the splitters with the CPU header, all fans on that splitter are speed controlled as they should be. with this arrangement the fans on the splitters run at 100% no matter what. The 2 wire pwm and rpm feedback lead is plugged into the mobo, and naturally the molex connector is attached to PSU molex.
The splitters are hooked up correctly - one fan is plugged into the "cpu fan" lead with 4 pins. I wired the three 120mm chassis fans on fan header 1, the 120mm cpu fan on cpu fan header, and the 140mm chassis fans on fan header 2. I used two Rosewill RCW-FPS-401 3-way pwm splitters. I also got two Xigmatek XAF-1454 140mm 4-pin pwm fans for chassis bottom inlet and top exhaust. I purchased four Xigmatek XAF-F1255 120mm 4-pin pwm fans for CPU cooler and Chassis front panel and rear exhaust.
These headers are clearly PWM/RPM/12v/ground as shown in the owners manual. I've an Asus M5A97 R2.0 motherboard which has three 4 pin chassis headers and one 4 pin cpu cooler header. I posted this in air cooling but I thought I'd spread around the knowledge pool a little thinking not everyone visits every forum.
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