R9 390 with a CX600M

[Erdy]

Hi guys, I have a CX600M psu, an Intel i5-4690k CPU and 2x8 1600 MHz Rams, I'll buy my GPU tomorrow but I'm worried about my PSU, should I get a GTX970 instead? I'm worried about vram on gtx970 I am and will be gaming on 1080p but some people say that the Vram wouldn't be enought in the future so I'm thinking to get an R9 390, what should I do?
Thanks.

 

[EarthDog]

That psu is fine...

Vram on 970 isn't a problem at 1080p.