How do I know that my SLi is working properly?

[dcnv]

Hi ! i just recently bought another 7800GT for my system = SLi now. I have enable the GPU for SLi and everything. But i didnt notice anything different from my system without the SLi on. Even when i go to Properties > Settings i just see 7800GT. So i wonder is there a way i can see if my SLi is really working? or is there somewhere in the system said that I have 2 x 7800GT? or is there a place i can see 512mb video instead of 256mb?
Thank for the help in advance

 

[shadowofthesun]

If you selected enable SLI in your nVidia control panel, AFAIK that's the only place to tell. One way to confirm is to turn on the load balancing graphs, which appear as green bars in certain supported games and show how much of each GPU is being used. This option should be in the control panel (unless it's been removed, which is possible.) Also, you could just go the old-fashioned route and use FRAPS to measure FPS before and after SLI is supposedly enabled. I guess you could try to see if Device Manager under the Windows control panel shows 2 display managers, but not having used SLI I cannot tell you if this is a feasible way to tell.