Gtx 960m vs r9 m290x? which one is more powerful.

[thehotter1]

i was wondering which gpu is more powerful?
I got a good deal on an alienware 17" for 800$ Canadian
with r9 290x and i7 4700MQ 16 gb ram wondering would it stand a chance against maxwell gpu's?

 

[starscream27]

r9 is a bit faster
http/www.notebookcheck.net/AMD-Radeon-R9-M290X.108643.0.html
http/www.notebookcheck.net/NVIDIA-GeForce-GTX-960M.138006.0.html