DukiNuki :
sims 3 with or without its expansion will require the same hardware specs . so if you can run the sims 3 standalone fine then you can run it with all of its expansions . just make sure to run the game with the right expansion to avoid crashing .
Not true; the more expansion packs you have installed, the more performance will vary. There are many reports of people with high end gaming PCs experiencing freezing and shoddy performance with all EPs installed. Graphically, you have the Seasons to contend with now.. and with all the extra content: scripts, objects (and bugs) that the EPs introduce, your CPU will need to work harder.
So, with all the EPs, performance
will decrease. How much it does varies.
I would expect the Acer Aspire 5742ZG-P614G50Mnkk to only be capable of around 25fps in most areas.