There have been several posts recently about the amount of RAM needed for computers. I think it all depends on how long you plan to keep the laptop and what you plan to do with it when you are finished. 8GB should be sufficient to run PS & LR today, but what happens in two or five years with 30 and 50 megapixel cameras on the horizon and the inevitable software changes to keep up with larger and larger files? Odds are that 8GB won't be enough, but if you plan to sell the laptop then, you should be okay. My personal example is that my iMac was really powerful seven years ago when it came with 2GB and could be upgraded to a whopping 4GB of RAM. It could handle anything that Photoshop and Lightroom could throw at it with the 10-16 megapixel files. But nowadays, even though my cameras have not changed that much, my iMac runs like a dog with Lightroom 5 or 6 and Photoshop CC, even after I upgraded it to 6GB of RAM. The software evolution to keep up with camera evolution made my computer run more and more slowly to the point where I had to buy a new one... this time upgradable to 32GB of RAM. (Hopefully it will last for seven years before becoming outmoded!)
