The article discusses NVIDIA’s second-quarter revenue report, which revealed a concerning level of customer concentration. While NVIDIA’s overall revenue grew by 101% year-over-year, a significant portion of this growth came from just two customers: Microsoft and an unnamed U.S. cloud service provider. These two customers accounted for a combined 67% of NVIDIA’s data center revenue, which is a substantial increase from the previous quarter’s 57%. This high customer concentration raises risks for NVIDIA, as a loss or reduction in orders from either of these major customers could significantly impact the company’s financial performance. The article suggests that investors should be cautious about NVIDIA’s customer concentration and monitor the company’s efforts to diversify its customer base in the data center segment. Additionally, the article highlights the importance of NVIDIA’s gaming and professional visualization segments, which have historically been more diversified and stable revenue sources.