Well, first off there's no such thing as PC2700 400 ram. Make sure the ram you're buying is compatible with the motherboard of the PC. PC2700 is 333 MHz, not 400.
If it is compatible, it's easy. Just take the case off of the PC, push back the ram securing pegs, put in the new sticks, push the securing pegs back on, done. I wouldn't put in the older chips. The new ones will be fine.
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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