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I'm shopping around for more memory for my MX3558. I know I need DDR 333 PC2700 SODIMM 200 pin. Do I want registered or unbuffered? Cas latency numbers? ECC? Its been a few years since I bough memory for my desktop and I cannot remember what I should be looking for. What happens if I use DDR 400 PC 3200? Will it just run at the lower speed and frequency?