You will get different answers from different people about the gaming cards. Some people believe that the CAD cards are a pure ripoff and totally unneeded. Some people believe that not using a professional card is always going to cause problems. My take is that gaming cards can cause problems, but they can often work well enough, espeically for people who are tolerant of their possible weaknesses.
RAM only affects performance when your models or simulations are big enough to use up all of the available RAM. If you work with reasonably sized files and simulations, then you probably won't notice any difference at all between 8 and 16 GB. On the other hand, if you do manage to fill up your RAM, then you will see a big decline in performance. Watch your RAM usage on your existing machine to get an idea of where you fall on the sprectrum.
I would not expect a laptop to run ANSYS or SolidWorks Simulation very quickly.
Check in the Administration forum for the CPU and hardware performance. Folks like Anna Wood and Charles Culp keep an eye on the best hardware and may already answered your question.Do some searches on i7 or Ivy Bridge. Look at the threads on recommended systems. You might want to move this question to that forum.