Graphics How can I tell if my dedicated graphics card is working

I have a GT650m in my Samsung Ivybridge laptop but I can't tell if it's working as I can only ever get a responce on the intel HD4000 if I check in techpowerup GP-Z.

 

Run something like the heaven benchmark

 

Well it worked. does that mean my GT650m only works with games as I've never seen it kick in with anything else?

 

it might have lucidlogix virtu on it, which switches between the two depending on how much gpu power is required

 

Having just googled it, I don't think I have it.

 

It makes use of optimus technology

http://www.nvidia.com/object/optimus_technology.html