Analysis-Nvidia investor dilemma: how much is too much in a stock portfolio?

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Nvidia Corporation (NASDAQ: NVDA) Delayed: 202.00 -6.65 (3.19%)
Previous Close $208.65    52 Week High $88.77 
Open $202.17    52 Week Low $24.75 
Day High $203.77    P/E 272.97 
Day Low $200.04    EPS $0.74 
Volume 71,855,773