That's an 8400M equivalent.
EDIT: According to Wikpedia it's both a G86 core and an 8400 equivalent which makes no sense to me. Stupid wiki.
I don't know a huge amount about this sort of thing, but what may be happening is that Demigod is unable to recognise your graphics card as being an 8400 varient due to laptop drivers registering it as an 8400M instead.
Try running something like a CUDA app, if after installing the CUDA runtime and running one of the samples you recieve a message "Cannot detect CUDA-Compatible Device" or similar, then this may be your problem. Demigod is detecting your video card as being an 8400M, or some random Quadro model, which it doesn't recognise as being compatible.
What OS are you on?
Do you have the latest NVIDIA drivers? If not, get them and then try it again. I'm pretty sure NVIDIA offer proper notebook drivers these days.
Try getting the custom drivers for notebooks if that doesn't work, to trick the application into thinking you have an 8400M.
I have run DG on a similar card, the 8600M without any issues, and had to work through the above to get some things working a while back.
