What kind of websites need 8GB per tab? I have never had problems with chrome or firefox on my 4GB box.

EDIT: someone in this thread posted this:

  I can't even scroll Twitter without stutter on my hefty gaming laptop, my browser (the whole thing! not just the tab!) often freezes for 10+ seconds when first rendering a page, and toggling Reddit's sidebar takes half a second.

This explains a lot, I (almost) never visit twitter or reddit.