I am about to receive a base model 2017 iMac 27 with a 512GB SSD. I am trying to decide on how much RAM to buy to add to the 8GB that is fitted. I had 24GB in my 2012 iMac and never noticed any problems. My most intensive uses are light photo and video editing. Would going to 32/40GB really make a noticeable difference or should I just save the cash?