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how much does a ram card and graphics card cost to reach these requirements
CPU: Pentium 4 2.4GHz Single Core processor
System RAM: 1GB
Video Card: Direct X 9.0c compliant video card with 128MB RAM (NVIDIA 6600 or better/ATI X1300 or better, excluding ATI X1550).
Sound Card: 100% direct X 9.0c compatible sound card

I have 504 RAM but i'm not sure what kind
and pentium 4
but i don't know were to find how much ram my video card or my system ram

I want to know because i want to buy bioshock and if bioshock runs on my computer gears of war has to run on my computer