Hi I'm looking forward to installing a graphics card on my desktop for gaming. It is a Dell Inspiron 530 with 4GB RAM installed but only 3.24 usable. It has a 1.8 Ghz processor, and it is a Windows 7 Ultimate 32 Bit. So, will I be able to optimally use both the RAM and the graphics card if I upgrade to 64 bit, or am I good the way I am?