HDMI won't support high res

This might not be entirely CrooFire's fault, but regardless I cannot go above 1200x800 or whatever it is. My monitor supports 1920x1080, and when I use DSUB/DVI I can go to 1440x1000. When I use HDMI, it doesn't work, and says my monitor doesnt support that res. My arse.
Help pl0x?

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