# core complex die

> a chiplet component of AMD Zen processors

**Wikidata**: [Q111442155](https://www.wikidata.org/wiki/Q111442155)  
**Source**: https://4ort.xyz/entity/core-complex-die

## Summary
A core complex die (CCD) is a specialized chiplet component used in AMD Zen processors to house the processing cores. It serves as a modular electrical component for data processing across Zen 2, Zen 3, and Zen 4 microarchitectures.

## Key Facts
- **Manufacturer:** AMD (Advanced Micro Devices), an American multinational semiconductor company founded in 1969.
- **Classification:** It is categorized as both a chiplet and a processor component.
- **Microarchitecture Support:** Utilized in Zen 2, Zen 3, and Zen 4 processor designs.
- **Internal Structure (Zen 2):** Contains two logical core complexes (CCX) per die.
- **Internal Structure (Zen 3):** Contains one logical core complex (CCX) per die.
- **Fabrication Method:** Produced using the N7 process for Zen 2 and Zen 3 generations.
- **Primary Function:** Acts as the core compute unit, distinct from the client I/O die (cIOD).
- **Common Aliases:** Often referred to as CCD, core compute die, CCX die, or Zen CCD.

## FAQs
### Q: What is the difference between a CCD and a CCX?
A: The CCD (core complex die) is the physical chiplet, while the CCX (core complex) is a logical component inside it. Depending on the microarchitecture, a single CCD may contain either one or two core complexes.

### Q: Which AMD processors use the core complex die?
A: The core complex die is a fundamental component of AMD Zen processors, including those based on the Zen 2, Zen 3, and Zen 4 microarchitectures. This includes product lines such as Ryzen and Epyc.

### Q: When was the Zen 3 version of the CCD launched?
A: The Zen 3 microarchitecture, which features a CCD containing a single core complex, was launched on November 5, 2020.

## Why It Matters
The core complex die (CCD) is central to AMD’s modular chiplet strategy, which moved away from traditional monolithic processor designs. By utilizing the CCD as a standalone compute die, AMD can scale the number of cores in a processor by adding multiple CCDs to a single package. This approach allows for greater flexibility in manufacturing and product segmentation across the semiconductor industry. The evolution of the CCD—such as the transition from two core complexes in Zen 2 to a single, unified core complex in Zen 3—demonstrates a continuous refinement of how data processing units are organized to improve efficiency.

## Notable For
- **Chiplet Architecture:** It is a primary example of a chiplet-based processor component rather than a single-die design.
- **Generational Flexibility:** The internal logic of the CCD changed significantly between Zen 2 and Zen 3, moving from a dual-CCX to a single-CCX configuration.
- **Advanced Fabrication:** Employs the N7 fabrication method for high-performance processing in Zen 2 and Zen 3 iterations.
- **Distinct Functional Role:** It is specifically designed for computation, maintaining a clear architectural separation from the I/O die (cIOD).

## Body

### Architectural Definition
The core complex die (CCD) is an electrical component designed for processing data within the AMD Zen microarchitecture. As a chiplet, it functions as a modular building block that is combined with other components, such as the cIOD (client I/O die), to form a complete processor.

### Internal Configuration
The internal structure of a CCD varies by microarchitecture generation:
*   **Zen 2:** Each CCD contains two core complexes (CCX).
*   **Zen 3:** Each CCD contains a single core complex (CCX).
*   **Zen 4:** The CCD remains the standard compute die for this generation.

### Manufacturing and Development
The CCD is manufactured by AMD, which is headquartered in Santa Clara, California (formerly Sunnyvale). The development of these dies is a key part of AMD's role in the semiconductor and computer industries. For the Zen 2 and Zen 3 generations, the CCDs were fabricated using the N7 process.

### Related Components
While the CCD handles the core processing tasks, it is designed to work in tandem with other specialized dies. It is explicitly different from the cIOD, which manages input/output operations. The Zen 3 microarchitecture, launched on November 5, 2020, represents the fourth generation of the Zen CPU design and utilizes the single-CCX CCD configuration.