Josef - Always use the default refresh rate and resolution for the target monitor. Most 27" monitors are at least 1920 by 1080 (i.e. 'Full HD'/ 1080p...
A geek with green leanings - A kiwi handler (North Island Brown Kiwi) I run a habitat restoration project in a huge forest near Wellington, NZ engaging hundreds of volunteers each year. When not tracking kiwi or planting trees, I am an ISP/ web designer and virtual rail fan