Hi,
Welcome to the community
Check out this link for possible upgrades on your Desktop, once you open an item, check compatibility to see if it will fit your system.
accessories.us.dell.com/.../PfydFeaturedCategoryResults.aspx
Let me know if further help is needed, you can also reach our sales team to check latest inventory. You can call them at 1-877-9073355 or chat http://chat1.us.dell.com/netagent/cimlogin.aspx?questid=ECD0842F-ABAB-4AB0-858A-95EAB5ED8593&portid=9C39C2B5-F1B5-4B42-9928-10AE367360BB&nareferer=https://chat1.us.dell.com/netagent/cimlogin.aspx? (Choose Spare Parts)
Regards,