CPU_OPT Fan Header

[ShivP]

Hi,

I have 4x 4-pin Enermax Fans but only have 3x 4-pin headers and 1x 3-pin header on my motherboard. I want to use all 4 fans, but can't right now. However, I do have a CPU_OPT header next to the CPU_FAN header which I could use. Is this safe to use or will I have to fork out the ~£5 for a PWM Y-Cable? Will the 3-pin motherboard header be okay to use?

Cheers

 

[ShivP]

Well I got a cable like this; http://www.overclockers.co.uk/showproduct.php?prodid=CB-031-AK plugged into one of my 4-pin headers, with two fans connected into it and the molex connected, and it doesn't change speeds anymore I think the 4-pin header's aren't actually PWM?

 

[ShivP]

Goddamnit, thought so. How can I get all of these fans to work via PWM as I want to control them via SpeedFan? And how is SpeedFan controlling those other fans which are in the 4-pin headers?

 

[ShivP]

Yes I believe they are PWM, weird they are in the CPU OPT fan header now and still I can't control them, I am using the black cable...

 

[ShivP]

Think I might have to buy a couple of these 4-pin Y cable things... Without external power or anything

 

[ShivP]

Bought two Y-Cables, hopefully they work.