Depends on which version of the program you're using and on what operating system.
I'm using the latest version of Premiere Elements 14 and Windows 10 64Bit
You're using a 64-bit program on a 64-bit operating system. It's already set up to use more than 2 gig of RAM. In fact, it will use as much RAM as you have.
Most taskes are done on the cpu.
Your videocard and your disk setup are also important.
What are your computer specs?