An unreal 7900GS · DIGIT-ARC

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i dont think you can overclock those old P4 CPU to that extent though you might try a bit. Adding RAM will improve system performance.

Another stick of 1 GB ram will definitely help

Wats the temp of ur gfx crd core after bout 2-3hrs of hardcore gaming.

1. My XFX card is factory overclocked to 480MHz and 700MHz (core and ram)
How far can this go?

Well , most of the 7900GS's can do 600/1600 i.e. 600/800 with the stock cooling ..

2. My CPU is 3.2 GHz plain vanilla Pentium 4. How can I overclock it to say 3.6GHz?

Its a prescott rite ?? If so then u can easily oc it to over 3.6 GHz ... a 3.2 GHz should easily do 3.8 GHz without oc'ing the RAM .. but make sure ur current load temps. are below 55c. ..

3. Will adding another 1GB stick of ram of the exact same specifications as
the existing stick improve system performance?

Ofcourse it'll ..