I just went from a 3.8
MGHz to 4.1 MGHz processor (A10-6800K), and doubled memory, from 8 GB of 1366 to 16 GB of 2133. The difference in performance is amazing. Mostly due to memory, I suspect (the only difference in CPU is the slight percentage increase in speed). Now to go put the old CPU and memory in her machine, which will be an upgrade for her Windows system.
[Update a few minutes later]
I’m sure the fact that the OS is on an SSD doesn’t hurt, either.
[Update late afternoon]
Oh, goody. In order to give her computer the new CPU/memory, I have to change the motherboard out, too, but the HP Pavilion case doesn’t seem to have cables marked. Sigh.