can't use gpu unless a display is connected to it.

i have a radeon hd 3870 with 2 vga monitors connected to it and an gtx 1660 s with nothing connected to it. drivers installed and all that. i can't get any app to use the gtx unless i connect a display to it.

no, i won't plug a display to it.

now what?

edit: updated windows. nothing changed. (i'm on windows 10)

edit2: upgraded to windows 11. still nothing.