Nvidia’s stock value has ballooned by an incredible $400 billion in just five days, causing quite the stir in tech and investment circles. Now at a staggering $3.26 trillion, as per Business Insider Africa, Nvidia has soared past many competitors, though it remains behind Apple and Microsoft in terms of global market capitalization. That $400 billion increase alone surpasses the entire market value of Costco, which is roughly $250 billion, even though the retail giant posted an impressive $254 billion in revenue last year. Don’t Miss: The average American couple has saved this much money for r…