Dell has outfitted 180w graphics card (GTX 1080) pairing with 460w PSU on several models of XPS.  Suggested PSU for RTX 3060 is 450w. It was a typo in your post that your current card is Nvidia Quadro Q4000.  My statement of Quadro P4000 should work fine with photoshop and lightroom still stand.  It's a 105w single slot card and used P4000 can be had for less than 200 usd.
I am upgrading my Dell XPS 8700 with a new graphics card because Adobe Suite no longer supports the current card. The current graphics card is the Nvidia Quadro Q4000 The card I am installing is the Nvidia GeForce RTX 3060 The XPS 8700 PSU is only 450 W maximum.  I want to install a new PSU - Corsair CX-M Series CX750M so I can power the new graphics card. Are the PSU and graphics card compatible? What issues might I expect to encounter with these upgrades? Thank you in advance. 
XPS 8700, upgrades CX750M, GeForce RTX 3060