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#51
One factor you have to consider the size of your video card counts into your ram count.
If you want to get full use of your system x64 would do it justice.
Dual boot x86 and x64 run a bench mark see which one scores higher. If x64 does and you can find the drivers for it defiantly go with x64.
Your games will still run in 32 bit mode (unless they have a 64 bit mode) but your system will still have the extra ram and make performance slightly better.