@iEllaLouise Some games load quicker and will take advantage of an SSD and some won't. The sims 3 loads 10 times quicker on SSD. The sims 4 has no effect on loading times with SSD. The SSD will boot windows quicker and some other programs you need for windows.
You have to leave at least 50 gb free hard drive space with the sims games. They not only use physical memory ( computer ram) but they also use virtual memory and you need free hard drive space for that. You will run out of hard drive space as your sims games get larger. As your saves get larger it will make your files bigger. If you use CC and mods that will take up even allot more space. We have had several people here have issues with having only one 256 gb ssd while trying to game just one of the sims games. You will have even more problems trying to game the sims 3 and 4 on one small 256 gb ssd. Again you need at least 500b ssd if you want to put the whole sims 3 and eventually a complete sims 4 game.
These games take up more hard drive space than stated by ea if you factor in saves, cc, mods etc.
You need enough hard drive space. 500 gb or more . You also need enough computer ram, a video card that meets requirements, a processor that meets requirements etc