assuming no user has yet successfully figured out psu upgrade higher than proprietary stock 460W/500W from Dell, there is already report of running RTX 2080 and 2080S in G5.  2080 has same 215W TDP as 2070S retail.  You should be all right running a retail 2070S in G5. [URL] the retail RTX 2070S have TDP=215W. [URL] There is no detailed data yet on Dell OEM RTX 2070S in comparison to retail boards.  There is data on Dell OEM RTX 2080 (TDP 215W) in comparison to retail. [URL]
I'm looking into some upgrades and am curious if the Dell 460w PSU can provide 30.4 amps on the 12v rail? Any information on what the maximums are for this PSU? I'd hate to upgrade just to find that the PSU doesn't support it.
Dell G5 5090 - PSU - Power at the rails