I am upgrading my laptop, dell inspiron 1521 from 1GB to 2GBwith a view to finishing up with 4 GB. at the moment there are two memory modules, A and B, of 512 MB. I understand that I should fit the new 2GB module in slot B. Do I have to renmove the 512 in slot A or can I leave it in? Also, if I only have one 2GB module fitted, does this affect the dual channel operation or is it ok to have 2.5 GB memory
Thanks guys