wat?
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Perfectly made sense.
Thats some awesome PC specs.
Not really. Multi core processors are really cheating, most instructions cannot be done in parallel anyway. A 12GHz processor would beat the shit out of a 3GHz quad core for most things a normal user would be doing. Multi processor systems are useful because different things can use different cores, ie OS and a game, the heat dissipation is also a lot better. It's like saying 1GB memory working at 10MHz would be equal to 10GB working at 1MHz, it depends on what you are doing.
For 5GB would probably be best to use 2x2GB and then the 2x512mb as long as they are all working at the same speed.
Edit: He's running 6GB of RAM, most likely 2x2GB and 2x1GB.