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XPS 15 - how to display steroscopic 3D on a 120Hz external monitor?

In order to display 3D, the usual approach is to use the NVidia Vision Kit with a 120Hz refresh external monitor. The XPS 15 (mine is an L1501X with NVidia GT435M graphics) has two video ports - HDMI and Mini Displayport.

I have an Acer G0245HQ monitor I'd like to attach - this does 1080p. I can use HDMI at 60Hz but apparently HDMI implementation doesn't allow for 120Hz signal.

The advice I've had from NVidia is I need to use the Mini Displayport with a suitable cable, specifically a mini display port to DVI-DL (DL=dual link) to output 120Hz and therefore get Steroscopic 3D. No joy yet in finding one, Dell sales support claimed no cables available from Dell and sent me to a partner www.startech.com who were helpful but only as far as determining they do not have a 3D capable product for DVI.

Has anyone successfully got stereoscopic 3D working on an external monitor on a Dell XPS system?

I'd appreciate any guidance, even if it means an expensive cable or a new monitor.

Thanks.