620 does not have UEFI BIOS. It wont ever work. You must use GT1030 1050TI card  1060 would require upgraded power supply.
I got a ASUS PH-GTX1650-O4GD6 display card for upgrading the desktop(Inspiron 620 - Intel I5 2310).When power on, it suspended & freeze at the first DELL LOGO screen, even cannot press F2 into the BIOS.And it sounds out "beep", a short beep and interval 4~5s to loop. After beep 3~4 times, the screen turn into black.The display card work fine on other PC, and Inspiron 620 can work with older type Nvidia display.I had replaced a 500W PSU, updated BIOS version to latest.Anything else help I could try, or that meant this BIOS cannot support the newer display card??
Inspiron 620, failure upgrade to GTX1650