Shares of Nvidia ( NVDA 6.97%) surged higher on Tuesday, after taking it on the chin Monday. The maker of graphics processing units (GPUs) used for artificial intelligence (AI) applications gained as much as 7.2%. As of 1:30 p.m. ET, the stock was still up 7.1%.

Since the start of 2023, Nvidia 's (NASDAQ: NVDA) stock has gained an astronomical 906% as of the time of writing. It's also right around its all-time high right now, but these two facts may scare some investors off.

Other technology stocks trading at relatively low valuations to historical levels include Micron, Super Micro and Workday.

The news is the latest sign of skyrocketing valuations for privately held AI start-ups, which show growing investor enthusiasm for AI and confidence that companies like Anthropic will justify that valuation over the long term, eventually generating billions in profits.