Hi Madan,
Go to www.crucial.com - and run the scanner. It will tell you what the maximum amount of ram you can upgrade to, what type of ram you currently have, and what you need.
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
When you get that info, you’ll then purchase the ram, and install it in your machine. What’s the exact model of your inspiron, i could find you instructions online, I’m sure.
Let me know!
- C