which memory module?

[charlotte49er]

I am trying to take advantage of the great Crucial discount but there are 3 diff't 256 DDR modules. There are some differences in the specs but not exactly sure what they mean? Can someone provide some guidance? Thanks.

DDR PC2100 ? CL=2.5 ? Unbuffered ? Non-parity ? 2.5V ? 32Meg x 64

DDR PC2100 ? CL=2.5 ? Unbuffered ? ECC ? 2.5V ? 32Meg x 72

DDR PC2100 ? CL=2.5 ? Registered ? ECC ? 2.5V ? 32Meg x 72

 

[Kingofcomputer]

normal use - non-ecc, unbuffered
crucial use (need error correction) - ecc
special use (server mb must use registered or mb requires registered to use all the slots) - registered

for detail about the difference, see crucial's faq.