Hi srhamlin,
okay now I understand more your situation...
Hum, I thinks he do not have a standard about this because each motherboard is not same...
But by exemple the P35-DS3L have a fan headers can support up to 3.0A
The Akasa make a 3 and 4 Pin Fan cable splitter ... so if you plug it on fan_cpu ... why not...
You have posibility for your GA-Z68M-D2H ask to
http://ggts.gigabyte.com.tw/Default.aspx Ask them if it is a standard for all or just for P67-Z68 motherboard or is it only for your model GA-Z68M-D2H.
As long as you take this step, ask them if there is a difference between fan_sys AND fan_cpu at the amperage on the motherboard.
Be nice to come back give us the answer ... it shares the information on the forum.
Gloup_Gloup