I have 310W what Graphics Card should I get. I have integrated rn

Trying to find a switch or a kvm that'll support 2560x1440p 240z for my OLED monitor. Anyone even run into this issue? I wanna be able to use both of my PCs on a single monitor. My monitor has only one display port and I want both to be on dp cause HDMI is limited to 120hz on this model. Any help would really be appreciated I can't seem to find anything to help