if you have a Adobe sub or stand alone Account then Felix is free to install and use
the down side;
- you need a payed Adobe account and Mac or WX system
- Adobe uses their digital CC to load the beta software and they don't put much effort into windows ui design... the install instructions on their site are wrong.
for reference;
My system is a stock Asus tp500ln with Dual boot w8.1 | wx
the image above took just under 5 minutes to rendor on Fast.
p.s, the cpu is what mainly drives rendors... [i7 in my case] the bigger the chip number the faster an image will rendor