Matrox TripleHead2Go
 

Since then, Matrox, has quite wisely stayed out of the expensive 3D
graphics performance race, leaving ATI and nVidia to battle it out. Instead
its had great success in niche areas such as providing solutions for
corporates, medical facilities and the military. The release of its
TripleHead2Go, marks something of a return for Matrox to the high-end gaming
market, at least indirectly. Matrox refers to the DualHead and the
TripleHead as Graphics Expansion Modules – the box provides the connectivity
and all the horsepower comes from the graphics card. In a sense, the
TripleHead2Go is the biggest advert for SLI that nVidia could ever have
hoped to have come up with