I Have the same spec laptop, I used 1proc with one core, and used the least amount of memory possible. In VMware less is more. I've found this out over the past 3 years, you can't really equate the virtual resources to physical ones. My Lab is set up accordingly
Vcenter/Domain Controller - 2Gb of RAM / 1 processor 1 core / virtualisation engine is set to automatic / the other 2 boxes are not ticked
Esx x 2 - 2Gb of RAM / 1 processor 2 cores / virtualisation engine is set to automatic / virtualise Intel is enabled
I'd suggest not to use the VCenter Appliance as it takes an age to load
Good look with the Exam