There was a post yesterday on the “Zwift on NVidia GTX 960”
Eric C. from zwift posted the following information on the Dell Alienware Alpha. It sounds like you are good to go :<)
"Any integrated graphics will never quite be up-to-snuff to get ultra or high settings. You can find a list of our minimum, recommended, and extreme settings on our website here: http://zwift.com/what-is-it#specs
But you’ll need a pretty beefy system to get up there. We’ve had a lot of luck with Dell’s Alienware Alpha which is a tiny desktop system that produces some great results for around $550. Of course you need to provide the keyboard, mouse, and monitor (or television).
The system I have at home is a Desktop system similar to Jon’s: a 4GHz i7-4790k with 16gb of RAM and an Nvidia GTX 970 Superclocked. That’s already pretty ridiculous
Eric C. 17 hours ago"