Can investors still win with Nvidia stock after today's explosive gains?Nvidia (NVDA 8.15%) stock posted big gains in Wednesday's trading. The artificial intelligence (AI) leader's share price closed out the daily session up 8%, according to data from S&P Global Market Intelligence.Nvidia stock gained ground in conjunction with a report from Semafor that the U.S. was considering lifting restrictions on the sale of advanced semiconductors to Saudi Arabia. If so, it would open up a new market for the AI compa ...