Pre Release 5 doesn't render with GPU (on my computer at least)

[Nonno 0]

Well that's kinda it. I've checked my settings, and they seem to be fine.
 

I am on a laptop, i have both integrated graphics and dedicated ones. I've set mine imator to use the dedicated graphics card and it DOES use it, only in viewport mode though. When rendering, however GPU usage goes aaalll the way down to 0 and CPU usage spikes up to 30-50 percent. Further checking showed that rendering was using for the most part a single core of my cpu. I don't understand why. I'd like it to render with the graphics card as it's much faster.

I can't find any solution so i assume it's a compatibility issue with my particular setup? i'm not really sure. It worked fine before? it's just with this specific version