Cuda in Badaboom How do I know if it's using Cuda?

How do I know if Badaboom is using Cuda to encode and export a video?
Is there a way to turn it on and off so that I can compare the difference?

My GFX card is 9800GTX+ so I’m pretty sure that it is using it, there is a drop-down shown 9800gtx+(0).
But I want to see if physical difference in the two and have the option, if there are any.