Writing to colleagues Huang, one of the most important people in the AI industry, has admitted to an affair.
It comes after a New York Times report in October alleged Mr Huang, 63, had a close relationship with a Chinese businesswoman who passed information to Beijing.
The US-based company says it is initiating an independent investigation, while top Republican lawmakers in the US House of Representatives have called on the CEO to brief Congress this month about the claims.
The company has said that while its board has no reason to believe that either US national security or Nvidia secrets were compromised, its inquiry will examine all available information.
Mr Huang fully supports the review and has committed to cooperating with it, it added.
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