How to make keyshot use the total available graphics memory?

I have rtx 2070 super with amd r7. When I tried to render a image in GPU mode in keyshot 9 the bottom of the rendering page shows (3033mb/8024mb). I dont know what this means exactly but I'm guessing that keyshot 9 is not using the total available graphics memory. Am I right ? If i am, how to solve this?