Pop quiz: How do you know if you’re witnessing a real wave of technology transformation, and not just a tech flash in the pan?

Answer: Look at the stack. In a true technology wave, the whole stack changes, not just one layer, says Kindred Ventures’ Steve Jang. And if you look at AI, he says, that’s exactly what’s going on: “Right now you’re seeing it all the way from chips all the way up through the application layer.”

Jang, Kindred’s founder and managing partner, was speaking at Fortune’s Brainstorm AI conference in San Francisco on Monday, on a panel to discuss how VCs are thinking about these bubbly times in the AI market. His point is that the angst over the AI bubble is kind of besides the point. What really matters is whether the underlying tech transformation is real or not.

Sapphire Ventures partner Cathy Gao, who was also on the panel, said that valuations for some companies have clearly climbed far beyond any sort of fundamentals. But she also noted that the growth curves of certain companies right now “far outstrip the growth curves of companies we’ve ever seen before.”

To help sift through the hype in this environment and find the startups with real staying power, Gao said she uses a three-question test.