I recently took my inspiron 3847 parts, bought a couple new parts, and built my pc.
I used these from my two year old inspiron: i5-4460, 1TB western digital HDD, 16gb RAM
I bought these parts to improve the PC: Case, 400w PSU, Radeon rx 460, Gigabyte GA-H81M-D3V.
All the parts were compatible...