Hey guys im relatively new to the whole computer modifications realm and upgrades. About a year ish ago i got a Dell XPS 8500, processor is an Intel Core i7-3770 CPU @ 3.40 GHz. I have 12.0 GB of RAM and windows 7 64 bit. Anyways I'm trying to upgrade my rig before Warlords of Draenor comes out. My graphics card is a GTX 640 which i know is pretty weak. So if i were to upgrade where should i go from here? Hopefully I want to make pretty cost efficient upgrades, nothing to crazy but i defnitly hope i'll see a difference. Thanks for any help If anyone knows of any killer deals too, please provide links