Setting Vertical refresh

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Auteur: Mark Berkwitt
Date:  
Nouveaux-sujets: How do you know? (Was: Setting Vertical refresh)
Sujet: 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?