Admittedly, it's hard to envision Nvidia doing it again. After all, the GPU maker now sports a market cap of over $4.2 trillion -- the highest valuation for any company ever. To turn $10,000 into $1 million, Nvidia's market cap would have to grow to a mind-blowing $420 trillion.

Even at record highs, Nvidia’s stock may not be as expensive as it is touted to be. Some valuation metrics suggest room for upside

Nvidia (NASDAQ:NVDA) stock continues its record-breaking streak, as it races toward the $5 trillion valuation mark – just weeks after breaching