Test & burn-in capacity

Test and burn-in capacity is the machines and hours needed to prove every chip actually works before it ships. It matters because untested silicon cannot leave the door, and the test time each AI package demands keeps climbing faster than the fleet of testers grows. The reason it has become a real bottleneck is compounding complexity: every high-bandwidth memory generation and every multi-die package adds more to verify per unit, while the equipment that does the verifying comes from only a few suppliers.

When test capacity binds, tester allocation delays turn packaged inventory into unshippable work-in-progress for months — the slowest serial step sets the throughput of the whole line. Exposure splits across the toolmakers who build the testers and probe systems — Advantest, Teradyne, FormFactor and Technoprobe — and the outsourced test houses that run them at scale, chiefly King Yuan Electronics and Powertech Technology.