Difference between GPU and CPU (Bump and?)

I have a scene I need to push over to GPU from CPU and so far I can see that I need to tweak bump settings - is there a formular for this, to make them look alike?
Is there anything else I should be keeping an eye on?

Hi, thanks for posting. There is no formula for converting the bump that works in all cases. You have to test a little and see what works best in your case.
Here we have a very detailed topic about moving your project from V-Ray CPU to V-Ray GPU.
If you encounter difficulties with your GPU scene you could send it for review here or on the support contact form.