If your vostro is the same as this Dell user who said "I bought a Vostro 3470, i5-9400, 8GB Ram, 256 SSD. It comes with a power supply of only 200w", then you could update psu to 360w, 460w, or 500w Dell proprietary with 6 pin white and 4 pin white  for example, a $ 29.99 Dell 360w psu used on eBay (see below).[IMAGE] Dell does make 500w, 460w and 360w psu in the Thin Form Factor (TFX). 2VD0G 360w Liteon 19YR3 360w 5K7J8 500w Delta99TPH 500w LiteonY7R0X 500w Chicony 4FWF7 460W Chicony HG9XD 460W, Acbel 92WNC 460W, Liteon [IMAGE]vostro-3470
Please tell me where you can buy a power supply more powerful than 200 wt
Power Supply