]I apologize if this is in the wrong sub forum.
I have 3.06 ghz intel core 2 duo 27" iMac. I run a windows partition to play some games on but I have trouble with fps on higher settings for two games ( Rift / EQ2 ).
Kind of a waste of money to buy a Mac for video games. Xbox or the like is the way to go.
Memory is not going to help you. The way to figure this out is by watching "Performance Meter". Looking there yo can see if memory or I/O or the CPY or disk access is maxed-out. It it is then address that, if not. if for example the CPU is ony 50% used then getting a faster one will only make it 25% used.