Question: are amd cpus compatible with nvidia gpus?
Answer: An AMD CPU will work fine with an Nvidia GPU, But the step up from a 270x to a 280 or to a GTX 770 isn't that big, I would personally just wait a bit till you actually start to get games coming out that your setup struggles with, a 270x and a FX 8350 should be able to run most games just fine on high settings at high ...