nvidia gtx 750

so i turned my old dell vostro 260 into a yosemite hackintosh, i have everything working but there is one thing that is bugging the hell out of me and that is that using an asus gtx 750 ti 2gb with latest web drivers I'm getting the wrong resolutions. for example the resolution i want is...

Shakta's Haswell GA-Z97MX-GAMING 5 ~ i5-4430 ~ Nvidia GTX 750 ...:beachball:Success!:beachball:... Components: Gigabyte LGA 1150 GA-Z97MX-Gaming 5 AMP-UP Audio Quad DAC-UP Multi graphic support Micro ATX...