MSI says the recommended PSU is 600 W for their RTX 3060 Ti GPU.  If the PSU isn't adequate, your PC might not even boot with the RTX 3060 Ti installed... Keep in mind that Dell OEM video cards aren't identical to "retail" cards and typically have been designed to work with smaller PSUs, so you probably shouldn't use a G5 PC with OEM RTX 3070 for comparison.
Hello all i have a Dell XPS 8930 with i7-8700 65W, 16GB DDR4, GTX 1070 150W. I want to replace it with the MSI RTX 3060 Ti 200W. However, my PSU is 460W, is it enough? Can I destroy the GPU when I game with it in this system and PSU is not enough? I have seen a Dell G5 gaming PC with 10700F and RTX 3070 220W with a 470W PSU so I guess it is possible. The XPS 8930 product page lists the GTX 1080 180W as possible GPU in the 8930. That is only 20W less than the 3060 Ti. Thanks
XPS 8930, MSI RTX 3060 Ti upgrade, 460W PSU?