Shouldn't i see somewhere around ~8-12gb? Looks like only 1 card is being used

Preferences:

This is what C4d Looks like:

maybe i'm missing the point and this is accurate but it just doesn't feel like twice as fast. I'm currently doing a render logging the time, then enabling the second one and checking the speed there. Problem is i'm at work and can only control my computer from work. Can't restart at the moment. Any ideas?
Thanks in advance!