The Vostro 3470 with 200w power supply can support a 30w GT 1030 but it does not meet power requirements to support 75w GTX 1650 or 75w GTX 1050.

Review this YT video for upgrade process https://www.youtube.com/watch?v=AucYJ18ubaw

Unfortunately you can only install a thin heatsink single slot width card in slot2 PCIex16 slot of V3470 because the psu is right underneath the slot (and you cannot install in slot1 above slot2 b/c slot1 has a closed end).  This means only low height GT1030 with a low profile heatsink may fit.  If you are okay w moving psu outside case then gtx 1050/1650 are possible.

https://www.dell.com/support/manuals/en-us/vostro-3470-desktop/vos_3470_service_manual/removing-the-system-board?guid=guid-e0dfa395-72bd-412a-9f1d-6e1110b68595&lang=en-us

psu can be upgraded upwards to 240/260w Dell oem from the Optiplex series or you can use standard psu w 24-6 adapter.  psu calculator shows a 240w is adequate for 1050/1650.  concur w chino that the stock 200w psu is a bit under.