Hi I was wondering what gpu would work the best for me between the GTX 760 and the GTX 750 TI to play modern games on ultra like Battlefield 4 and Watch dogs and AC Black vlag at a resolution of 1600×900
Your picture will generally look noticably sharper. It'll make games look a fair amount sharper. 1600x900 is a decent resolution but 1920x1080 is a noticable step up.