2G is max RAM, hard limit. Some Core 2 Duos will work -- that said, take whatever you'd spend on the upgrades and buy something newer -- this is a 16 year old notebook -- you can easily find a system much newer than this for not much more than you will spend on parts upgrades on this dead-end model.  
Hello,   This weekend I added another *vintage* dell laptop to my collection. A very well taken care of Inspiron e1705, with the exception of a bad battery. It works fine, and has windows 7 on it. 1gb ram, 1.7ghz processor. It uses the same power supply as my Vostro 1710, so it works fine when it's plugged in. It was $12.. haha    My question is.. has anyone tried maxing out the specs on these? I want to try, not sure where to start. It's limited because it has an onboard GPU, so that cannot be upgraded, and it's a 32bit processor...  So I guess I'm just looking for Max ram.. I know 32bit support up to 4gb.. so if it can handle that, I'd like to know,   And processor.. it's got the T2250 Core Duo. I've seen the CPU upgrade page and it shows a T2700 is the biggest core duo... But can this motherboard support core 2 duo?    Any info would be appreciated. This will probably end up as a homework device for one of my kids.   Thanks!
Possible upgrade info for Inspiron e1705