If you still have the tech demo.. Double check from the nVidia control panel, that ACS.exe is definitely using the GT 120. If it is, then turn all graphics down, use a single screen and a bearable resolution. See if you get any FPS. You may not, though, that thing is worse than the one in my laptop, which was old years ago. Ultimately, there may be slight optimisations in the current early access version, but not ones significant enough to make your FPS double.