A note on the dual channel discussion:
One stick of PC3200 allows 3.2 GB/s of information to sent. When two sticks of PC3200 are run in dual channel, 6.4 GB/s of information are being sent. Running in dual channel doesn't change the speed of the RAM, it just lets twice as much information go through at one time, which makes it seem like the RAM is running faster.
Jesus said to him, "I am the way, the truth, and the life; no one comes to the Father but through me". -John 14:6