Apologies that you did not yet receive a response.
The best low profile video cards that we validated for the low wattage 255/290 PSU were =
FDT1K AMD Radeon R7 250
W42M3, F9P1R AMD Radeon R5 240
DMHJ0, MX4D1 AMD Radeon HD8490
YT0RH AMD Radeon HD8570
2FVV6, 0WH7F AMD Radeon HD7470
The Nvidia GT 1030 is you best option as of now.
I do not work for dell. I am also a user.