Foundries and chip designers release these early silicon revisions to trusted partners so they can build compatible motherboards and test system stability. These chips often have open clock multipliers or extra debugging features that retail versions lack, but they may also contain unpatched hardware bugs. They are strictly meant for internal validation and are usually stamped with confidential markings.
Don't use the engineering sample for the final thermal qualification since its power delivery profile might change in production.
Engineering samples are legally the property of the manufacturer and are technically loaned, which is why buying them on secondary markets often violates non-disclosure agreements.
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Related terms
Tape out
To finalize an integrated circuit design and send the manufacturing data to the foundry.
Silicon lottery
The natural variance in manufacturing quality that dictates how far a specific chip can be overclocked.
Chip
A small piece of semiconducting material containing a complex integrated circuit.
Motherboard
The main printed circuit board in a computer or complex electronic system routes power and data between major components.