You need to focus you're questions. But, you can only use as much ram as you're mobo supports. Most modern mobos are capped at 8-12gb of ram. 12gb of ram is alot, and I don't know of any game or program the
average user would need that much ram for.
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GIGABYTE MA78GM-S2HP AM2+ MOBO - AMD Athlon X2 7750 BE - 9800GT 1GB
4GB PC2 6400 Dual Channel - 500GB SATAII 300 - 1TB FREEAGENT USB 2.0 - TRI Boot WinXP Win7 Ubuntu 9