Show me where I said it wouldn't work with 4GB of RAM? Please.
I said you want as much as possible. Nothing more, nothing less.
Sorry for the misunderstanding. I thought you were saying 4GB is not enough for PS
FWIW, I tested Mavericks on my late 2007 MBP, and running just Safari with few tabs and Maps ate more than 2GB of RAM... Anyway, I might upgrade my wife's MBA to 8GB so she could run smoothly several medium to heavy applications at the same time...