Now I have $200 exactly 10,000 Php budget. and I want to play games like battlefield 3/Batman Arkham City on Max Ultra without lagging. I think the only thing I should Upgrade is my GPU and also I heard that I should upgrade to 64bit because I have 4GB of ram and my technician only installed 32bit windows. Then I heard that I cannot use all 4GB of ram with 32bit. Please state a good GPU to run those games with my total budget of $200 exactly 10,000 php.