There should be a label on the bottom of the system (or if the system is old enough to have a removeable battery, under the battery).

You can also look up the model number using the service tag (bottom label) at dell.com/support

I have it in pieces anywhere else I can get that information 

Most likely the answer is no, but we'll need the exact model number (on the setup screen -- F2 at powerup) to tell you. 

Is it an Inspiron 3541, 3552, etc.