When your RAM is hogged to the very limit, as is the case when you have a 4GB Mac with an HDD which I sadly possess, you basically double the overhead of every operation in the system. Some people here are saying that "thats what the RAM is for", that derives from not understanding how RAM actually works. Constant deallocation and reallocation of memory will also impact your battery life. It's a massive overhead and a major annoyance. For example, users can type Show me pictures that I took in Yosemite National Park in July 2014 and Spotlight will use that request to bring up the. Every time you do one of those thing OSX will have to deallocate stuff from the file cache for applications to use since theres no space left. You will constantly see beachballs, stuttering and frame skipping. Your RAM space will be filled to the top with cached files, and then every time you try to say, launch a new app or open a new tab, go to a heavier website, even for simpler things. On HDDs however, 4GB will be painfully slow. On Fusion Drives, the SSD portion of the drive is the one used to do the caching, so on those 4GB also suffices. The SSD is already fast enough so there is really no need. I've been to that, but on that page it says you can go from Yosemite to Mojave, but then on the tech specs for Mojave, it says you need os x 10.8 or later. When you have an SSD, OSX will not cache things to memory to speed things up. 4GB if you have an SSD, 8GB if you have a regular HDD.
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