Nvidia Corp. NVDA, -4.06% said in a statement Monday that Tesla Inc. TSLA, -10.34% was wrong in describing its self-driving computer as more powerful than Nvidia's, which Tesla used until it began developing its own chip. "Tesla was inaccurate in comparing its Full Self Driving computer at 144 TOPS of processing with Nvidia Drive Xavier at 21 TOPS," a spokesman said in an email. "The correct comparison would have been against Nvidia's full self-driving computer, Nvidia Drive AGX Pegasus, which delivers 320 TOPS for AI perception, localization and path planning." The statement also contends that "while Xavier delivers 30 TOPS of processing, Tesla erroneously stated that it delivers 21 TOPS. Moreover, a system with a single Xavier processor is designed for assisted driving AutoPilot features, not full self-driving." Tesla showed off its new chip and other self-driving information at an event earlier Monday. Tesla shares finished Monday's session with a 3.9% decline, while Nvidia stock increased 1.2%.