Re: Dimension 8400 RAM
THIS <ADMIN NOTE: Broken link has been removed from this post by Dell>will explain how to install new memory modules in a 8400.
Keep the original memory [2 x 512mb modules] in the connectors 1 & 2 and install the new 2 x 1gb modules in 3 & 4.
Installing new RAM will not effect the paging file allocation.
I've found it best to let Windows take care of the paging file, that's on the C:/ drive.