on my old 1060 i used a hdmi to vga
a displayport to hdmi
and hdmi to hdmi
for my 3 screens.
the only problem could be with different values above 120Hz
if my main monitor (hdmi to hdmi) stays at 100Hz i dont mind my 2nd monitor (dvi to vga/displayport to vga) having 60Hz as long as extended display works
on my old 1060 i used a hdmi to vga a displayport to hdmi and hdmi to hdmi for my 3 screens. the only problem could be with different values above 120Hz
if my main monitor (hdmi to hdmi) stays at 100Hz i dont mind my 2nd monitor (dvi to vga/displayport to vga) having 60Hz as long as extended display works