Dual Screen Setup - Force one single refresh rate across both monitors

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http://askubuntu.com – I have to different but simlar monitors. According to nvidia-settings my main monitor is running at 59.93 MHZ while the other runs at 59.88 MHZ. In X Video settings I have enabled VSync and that it should sync to my primary monitor. This results in video tearing on my secondary. Is there a way to specify a refresh rate at which both monitors should run? (HowTos)