Quang Khoi Thai

My AW 18 780M SLI almost reaches the limit of 330W when full-loading without OC. I think that there will be higher capacity adapters in near future; and I'm really curious to see how Dell keep the mobility for a 600W adapter

I encountered quite similar problem on my old M17X R4 as yours. The machine turned off suddenly sometimes without a sign. Then I found that the graphic card caused a short-circuit; and that's why the power brick turned off automatically (to protect to system). I removed the graphic card and used Intel HD graphics instead, then machine worked well again. Thus, I think that your problem comes from the discrete graphic cards.