8 fans .30A = 2.4A, plus stall current to ovecome at turn on.http://www.digikey.com/product-detail/en/NTD4963N-35G/NTD4963N-35GOS-ND/2305685I think these will run nice & cool for you.Use a 150ohm resistor between arduino pin & gate.Connec the MOSFET between the fan '-' and Gnd. The fan '+' to 12V.Put a 1N4001 diode across each fan, cathode to +12 and anode to fan '-'; this lets the motor generated "back emf" dissipate in the motor when you turn off the MOSFET.
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