I just ordered (from Costco) an XPS 8950 i7 with 32mb ram, 512 m2 ssd and 1T HDD, RTX 3060TI graphics, and tray DVD.  1. Is the 450-460 watt in this system likely to be an issue requiring upgrade? 2. The 1T HDD is likely to be replaced by either a 1T m2 slot drive or 2 Samsung 860 1T ssd drives for storage. 1. No, since Dell built-it this way, it should be fine. IIRC, that smaller Power-Supply was a good/appropriate 12v rail-circuit for video cards. 2. Yes. Make the bootable C-Drive a M.2/NVMe SSD (480gb or larger) and then start adding 2.5inch SATA-3/600 SSDs as required for D-Drive and beyond. I suggest you use the 1tb spinning-platter HDD somewhere else or at least outside the machine (like maybe in an external enclosure).  
I just ordered (from Costco) an XPS 8950 i7 with 32mb ram, 512 m2 ssd and 1T HDD, RTX 3060TI graphics, and tray DVD. The 1T HDD is likely to be replaced by either a 1T m2 slot drive or 2 Samsung 860 1T ssd drives for storage. Unlike most of these systems, the Costco unit comes with the 450 watt psu instead of the 750 watt supply. The Nvidia web site says this graphics card should have a minimum 600 watt system psu. Is the 450 watt in this system likely to be an issue requiring upgrade? I do not do any major gaming or photo work, mostly stock market programs (math and graphs) and an occasional movie, and background music from the Klipsch speakers. I couldn't say no to the $1199 price at the local warehouse, (and the 90 day return), but wonder if I have enough power? Any advice would be appreciated!
XPS 8950, 450w power supply enough?