I have a Dell studio 540. 2.33 GHz and a 6gb RAM. Stock graphics card. What games could I play if I were to upgrade to 8 GB RAM and a Intel Core 2 Quad Processor Q9550 2.83GHz 1333MHz 12MB LGA775 CPU, OEM with a PowerColor AMD Radeon R9 270 2GB GDDR5 OC DVI/HDMI/DisplayPort PCI-Express Video Card AXR9 270 2GBD5-TDHE/OC graphics card? I'm new to this stuff.