[Jonboy]

i am not saying it makes a power difference,
what i am saying is the tracks on the motherboard can cope with the odd cpu fan and smaller system/north/southbridge fans but i would not trust running the larger fans used for case cooling due to the thin tracks now used on the newer motherboards i would rather hook them up to the molex from the psu.
people dont realise electric current moves and any movement causes friction and friction causes heat why take the risk of burning a track out if you dont have to .