Nvidia is one of the biggest winners this year, but is on track for its first monthly decline.Jakub Porzycki/NurPhoto via Getty Images Even AI-related stocks haven't been immune from this month's market sell-off. Shares in semiconductor firms have slipped, with Nvidia set for its first monthly decline of 2023. Meanwhile, investors have started betting against funds tracking the AI sector. Stocks are off to disappointing start for the month – and the theme that's taken markets by storm this year seems to be under pressure.The S&P 500 is down 5% and the tech-heavy Nasdaq Composite has slumped 7% over the first 13 trading days of what's typically the quietest month of the year for investors – and even artificial intelligence isn't immune from the sell-off.Here's a round-up of AI's struggles this August:Semiconductor giant Nvidia, which has emerged as one of the market's biggest winners in 2023 after riding the ChatGPT wave to a $1 trillion-plus valuation, is on track for its first monthly decline of the year, with shares down 7%.