No the 8700 is not eligible. Microsoft set the requirements and Dell has the list of Dell computers--- Dell computers tested for upgrade to Windows 11 | Dell US  However-- no need to buy a new computer. Windows 10 is supported by MS until 2025.
this retiree has a 6 1/2 year old tower desktop. can the processor be upgraded to meet  windows 11 standards or do I have to buy a new one? xps 8700 i7-4790 24 ram  
XPS 8700, upgrading to Windows 11 possible?