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This post has been rather helpful. Thise who made the upgrade to dual 980m will need this. I finalize my dual psu. My design has only two 30amp diodes and modular design to connect one or two PSUs. I can add simply a third PSU anytime! I did use initialy a rectifier bridge, but the forward voltage was high, so the output voltage was too low (18,2 volts) so the laptop under full load, it tripped. My design also has a display and a shunt. It shows me output voltage, output amperage, total wattage and watts per hour. I can tell you that my 3720qm and the dual 989m with the dell vbios can pull 560watts during firestrike. I couldn't image what will happend when I have a 3920xm overclocked and premas vbios on the GPUs! My guess will be at 630+ watts. Everything is soldered inside and insulated. No heat is produced, but I put it in an alouminum box anyway.