The doubling of Nvidia shares so far this year was one for the all-time market annals and it's top today was close to Apple as the world's second-most valuable company.
However it's all come down as a wave of profit taking sends shares down more than 6%. That sentiment has spread to other high flyers as well with Costco down 7.5% and Broadcom off by 6.75% and Supermicro down…