Setting Vertical refresh

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Skribent: Mark Berkwitt
Dato:  
Nye-emner: How do you know? (Was: Setting Vertical refresh)
Emne: Setting Vertical refresh
Using Redhat 7.2 and finding it's pushing my Matrox G450 and monitor to
frequencies beyond the monitors capabilities. The specs list at 160Hz max.
I want the Vert. refresh to be set at 85Hz.
How can I force this setting?