Yosemite 10.10.2 Choppy graphics

[tc92]

I just got a clean install of Yosemite runing well with sound, wifi, and bluetooth
however the graphics are very choppy and videos are even worse
i have a evega GeForce 760 sc installed and I used chimera to load Yosemite
any help is greatly appreciated

cheers

 

[Biggyskittle]

Did you end up resolving this issue and if so how?
Thanks