Nvidia is putting $3.5 billion into a $3.9 billion convertible bond sale by Taiwan's MediaTek — good news for both chip firms and a sign the AI buildout keeps pulling in huge money.

• Nvidia took the bulk of MediaTek's bond sale, the largest ever by a Taiwanese company.
• Alphabet, Google's parent, and big international investors joined in too.
• MediaTek will use Nvidia's NVLink Fusion technology so cloud firms can build custom AI chips that plug into Nvidia's systems.
• The tie-up covers AI data centers, AI on personal devices, and chips for software-driven cars.
• Taiwan's stock market closed up 1.78% the same day.

Outlook: Expect more custom AI chip deals as Nvidia locks partners into its hardware ecosystem.