yes you need to upgrade psu to 550-600w.  use a standard form factor 550w ATX psu (which has a black 6+2 pin PCIe connector) plus a 24 to 8 pin adapter for Dell inspiron 3670. EVGA has good deal on 550-600w psu. Nvidia rtx 3050 spec 
Hello everyone! So, I'm interested in upgrading my 1050 TI that I purchased a few years ago for my Inspiron 3670 to the new RTX-3050 that's going to be released Jan-27 2022. However, my PSU (the pre-included one) is only 300 watts or so, (and I don't see any extra cables inside the case which I presume would be needed for a higher end GPU). Would the RTX-3050 work regardless? Or would I need to upgrade my power supply, and if so, how would I go about doing so? Cheers! ~ DominatorVIP
Will the new RTX-3050 work with my Inspiron 3670?