I have the M18xR1 with a 2920xm and 780m SLI - it runs with the 330w adapter, but I can not take full advantage of the CPU and GPUs with the single 330w. I have all the pieces for the dual adapter mod Mr. Fox developed, just need to set aside time to get it done. The benchmarks I've run since upgrading have shown that as I push the CPU and GPUs it gets starved for power, but the temps are still very good, so just need more juice! Edit to add: If you're planning to run stock and not benchmark - should be no problem, I don't see any issues with power demand at stock.