Its really not that hard to upgrade the power supply. The 7770 would run on a nice 350W, but 300W is definitely pushing it.
EDIT: If you want step by step, I could probably help you.
thats very generous! but once my computer is unplugged, my connection with the outside world is gone. haha.
the only reason i can afford these upgrades is because it was recently my birthday.
college does not take kindly to my wallet. haha.