speed binning

Speed binning is the practice of **testing each die and sorting by maximum operating frequency**, then selling faster chips at premium prices and slower chips at lower prices. It's how chip companies extract maximum value from manufacturing variation. **How Binning Works** Not all dies from the same wafer perform identically—**process variation** causes some transistors to switch faster or slower than nominal. After wafer fabrication, every die is tested at multiple frequencies and voltages. Dies are sorted into **bins** based on the highest frequency they can sustain while meeting power and reliability specifications. **Binning in Practice** Take Intel Core processors as an example: all Core i5, i7, and i9 dies may come from the **same silicon design**. The fastest dies become **i9** (highest clock speeds, premium price). Good-but-not-fastest become **i7**. Average performers become **i5**. Dies with minor defects (one core disabled) become **lower-tier** products. **Binning Variables** • **Frequency**: Maximum stable clock speed at rated voltage • **Power**: Leakage current determines TDP (thermal design power) bin • **Functional blocks**: Dies with a defective core, cache block, or GPU unit can be sold as lower-SKU products with that block disabled • **Voltage**: Minimum operating voltage at target frequency (lower Vmin = more efficient) **Revenue Optimization** Without binning, a company would have to price all chips at the **lowest common denominator**. Binning captures the value of the best silicon. A **$200 average die** might sell as: 10% at $600 (premium bin), 30% at $300 (mid bin), 40% at $150 (value bin), 20% at $80 (budget/defect bin). The revenue-weighted average far exceeds a flat-price approach. **Yield Recovery** Binning is also a **yield recovery** strategy. Dies that fail at the top spec aren't scrapped—they're sold as lower-tier products, converting potential scrap into revenue.