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Trying to learn about ram (help)

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Aug 22, 2002
Ok, Ive established after reading a lot about memory that the 3 best brands are Mushkin and Corsair (XMS Series) and Crucial. I have decided to go w/ Corsair XMS. I really dont know that much about RAM and am basing my choice soley on reviews and recomendations from others. So I have some questions.

What is CAS? 2, 2.5,3

What is the number string that usually follows the cas
ex. 2-2-2-3-7

What does T1/T2 mean?