Alienware x51 R2 upgrade help

I have a question regarding upgrading my Alineware x51 R2 that currently has a i5-4460 and a Gtx750ti with a 300w power supply. I am wondering if it is possible to upgrade to a i7-4790k or i7-4790, a gtx 960 as well as adding an SSD. I am just wondering if my system will be able to run all of these components without crashing.