I have this PC http://www.bestbuy.com/site/ibuypower-desktop-amd-fx-series-8gb-memory-500gb-hard-drive-black-blue/6980021.p?id=1218818471270&skuId=6980021 and I want to upgrade my graphics card to play minecraft on med/ high settings and maybe a 128 by128 texture pack! So just tell me some graphic cards that might be what I'm looking for!