I'm asking about my Foxconn AM2+ motherboard A79A-S. The provided sys fan is one 4 pin (meaning PWM enabled). So how many 80 mm or 120 mm PWM fans could you bank together into the 1 connection into the mobo sys-fan? I understand that by using PWM in bios & software, that one could put power into the connector with an easy 25% margin of comfort. Would that be proper thinking? Some of the Supermicros have done this. My skill level isn't up to interpreting their position. So this looks like a good alternative instead of joining 4 fans to 4 connectors separately. What are the downsides?