Mrs TT may (just may) be starting to consider ditching her still functionally working, but unblessed with Windows 10 2009 Gateway Desktop (16GB) that still works well, but is, well, a desktop. Up for consideration are the Air and the MB. I grabbed me a 2013 Air a second machine at work to augment my Windows desktop when I'm at meetings, and I've found that I'm very happy with the speed, weight and surprisingly unfazed by the non-retina screen that my 2015 MBP has. So, given that whatever I obtain I'd want to last her as long as that ole Gateway desktop has, my big question (when looking at the specs) was the difference between the clock speed on the CPUs on each device. The Air is listed as coming with 1.8GHz dual-core Intel Core i5 or 2.2GHz dual-core Intel Core i7 processor and a Turbo Boost up to 3.2GHz, with the MB having 1.2GHz dual-core Intel Core m3, 1.3GHz dual-core Intel Core i5, or 1.4GHz dual-core Intel Core i7 processor and a Turbo Boost up to 3.6GHz. On paper it would seem that the clock speed on the most expensive MB is potentially slower than the Air. However I wonder if any geeks out there can weigh in with what this really means in real life. Use cases for this laptop would be browsing, Office and War for the Overworld (which she's beed addicted to ever since it first came out as Dungeon Keeper). That said, I'm also cognizant that this baby needs to last 10 years. Does the lower reported clock speed on the MB really make much of a difference - and would upping the RAM to 16GB (whereas the Air currently locks you in a 8GB) [whilst not affecting the CPU speed I know] counteract any potential slower speed?