Is there a case for more than 8GB of RAM? Sure there is, but the bang for the buck trails off.
Here is a definitive guide to how much RAM your PCs needs.
Note that how much RAM, along with the type and speed, that your system supports will depend on your motherboard. Consult your PC/motherboard manual, or, if your PC was manufactured by an OEM, use a system checker such as the one found on Crucial.com to find out what RAM is compatible with your system...
Read more: How much RAM does your PC really need? | ZDNet