Bought an HP Probook from a reseller, seems to have wrong graphics card

I have bought a Probook from Ebay, 'opened, never used', however despite being a Probook 450 G9 with an i5 processor, has the UHD graphics card. The listing suggested it should come with the Iris Xe, and the HP website suggests the i3 models come with the UHD, the i78 and i9 models with the Xe. The graphics as I understand is integral to the motherboard, so how do I have an i5 version with the UHD graphics installed? Are people putting i5 processors on i3 motherboards for cheap resale?

Question by J Collins on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.