When it comes to the semiconductor sector, why does the market obsess about Nvidia ? That was the question that had Jim Cramer scratching his head on Tuesday’s episode of “Mad Money,” as he called the market’s focus on this single chip maker “repulsive.” As the most recent Consumer Electronics Show just proved, there is a lot of really important technology that relies on chips not made by Nvidia, a stock that rallied 220% in 2016.