[ale] RAM upgrade question

[cc.thomas at earthlink.net (Courtney Thomas)]

I need to increase the RAM capacity from 128 to 512MB in a portable.

I've located some SODIMMs, whatever that means, that appear to match the 
docs on my machine's RAM requirement, except that said modules are CL3, 
not CL2.

Of what significance is this ?

Any other caveats ?

As always, appreciatively,

Courtney