I currently have i5 8400 ( going to upgrade to a i5 8700 in a few years when its needed)16gb vengeance DDR4 ram.. recently ordered a 1080 ftw2 im curious for more AAA gaming like tomb raider, shadow of war, fallout 4, RPG etc , fps mainly BF1,overwatch,destiny2 SW battlefront.. curious if worth going high refresh rate 1080p monitor or go with 1440p 60-80hz or 100 + monitor.. also was curious can i change resolution on lets say 1440p 144hz monitor to lower refresh or 1080P at high refresh rates for older games.. sorry new to whole high refresh monitor thing.. help would be most appreciated