Bad Resolution

So I’ve successfully installed Catalina on my pc, but my resolution is very low, it’s at 1024x768 even though I have a 1080p monitor, and when I go to adjust the resolution there is only one. How can I fix this? My GPU is a gtx 980ti and my CPU is a i5 6600k and I’ve done this using opencore. Any way to fix the resolution? Also I’m using a DVI cable since does that matter?

submitted by /u/Mike_hal
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