Pending OP Response I don't know what this is but I'm assuming its GPU related

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Double check what you are getting, the description in the link say rm850e but the link takes you to the rm750e, complete with picture of a 750watt model.

If any PSU has 80+ Gold and 10year warranty, you'll be getting as good one.
 
Agreed on the PSU however the OP has other issues going on but being that they never acknowledged what was mentioned regarding them having the Windows Power Plan set to high performance and the PC not being set up correctly I did not chime back in, helpers should not have to interrogate members to get the required feedback :(

Related thread XPS 8950, 460W PSU insufficient

Fwiw, the OP should not head off and purchase a more powerful PSU than what is required and reason being is that the present RTX 3060Ti GPU is a Dell branded card that has been dumbed down so as not to require as much power as a stock 3060Ti from Nvidea or third part brand such a EVGA or MSI to name just two, this done to save money and reduce heat both of which results in a performance hit and a bit more work with setting up.