Cameron Miranda
Moore's Law, an empirical relationship and observation made by Intel co-founder Gordon Moore, states that the number of transistors in an integrated circuit (IC) doubles about every two years. This law has been a driving force behind technological and social change, as well as economic growth. However, it is not a law of physics and has physical limitations. As transistors reach the atomic scale, progress has become slow and expensive, and the law may be approaching its natural end. There are also growing costs related to energy, cooling, and manufacturing, as well as the impact on the environment, that threaten the future of Moore's Law.
| Characteristics | Values |
|---|---|
| Formulation | The number of transistors on an integrated circuit (IC) doubles about every two years at a minimal cost. |
| Transistors per integrated circuit | The most popular formulation is the doubling of the number of transistors on ICs every two years. |
| Density at minimum cost per transistor | It is not just about the density of transistors that can be achieved, but about the density of transistors at which the cost per transistor is the lowest. |
| Transistor size | Transistors have become microscopic structures printed on small sheets of carbon and silicon molecules. |
| Limitations | Physical limitations, speed of light, atomic nature of materials, growing costs, and energy consumption. |
| Alternatives | Software performance engineering, solutions in software, algorithms, and hardware architecture. |
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What You'll Learn
Transistors can only get so small
Transistors, which are essential in almost every electronic device, have been getting smaller and smaller for decades. This has meant that they have also been getting faster and faster. However, there is a limit to how small transistors can get.
Transistors are now only about 70 silicon atoms wide, and the possibility of making them even smaller is shrinking. As transistors approach the size of atoms, there are physical limitations to how much smaller they can get. For example, at a certain point, transistors may no longer be able to block electrons, leading to many false positives. Smaller transistors are also more vulnerable to overheating.
The semiconductor industry is approaching the natural end of Moore's Law, as companies compete to build ever-more-powerful chips against the reality of physical limitations. In 2014, Intel launched a 14nm chip and struggled to bring a 7nm chip to market. However, in 2024, the company began receiving parts for a machine that can create technology that "pushes Moore's law forward" and can print transistors as small as 2nm.
While transistors can only get so small, there are other avenues for the semiconductor industry to advance. For example, different materials are constantly being tested to find new use cases. Photonic chips, which use light instead of electrical signals, are also being explored as a possible solution.
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Physical limitations of wires
Moore's Law is the observation that the number of transistors in an integrated circuit (IC) doubles about every two years. It is not a law of physics but an empirical relationship based on historical trends.
The physical limitations of wires in relation to Moore's Law can be explained by the following:
Heat Management
The increasing thermal noise voltage (Johnson-Nyquist noise) on decreasing characteristic capacitances, along with the constraint of using lower supply voltages to manage power dissipation, can cause Moore's Law to break down within 6-8 years or even earlier. This is a critical issue that has led to the development of various cooling schemes, such as pool boiling, detachable heat sinks, channel flow boiling, and microchannel and mini-channel heat sinks.
Quantum Mechanics
Quantum computing, which utilizes quantum mechanics for faster computations, has emerged as a promising alternative to traditional computing. However, the current state of hardware limits the ability to find embeddings, which are essential for optimizing quantum computations.
Nanowire Transistors
The development of nanowire transistors has the potential to spur the creation of microscopic computers. While this technology has advanced significantly, it is still challenging to create transistors that are small enough while maintaining their functionality.
Interconnect Innovations
While not directly a factor in creating smaller transistors, interconnect innovations of the late 1990s, such as chemical-mechanical polishing and copper interconnects, have enabled improved wafer yield, additional layers of metal wires, and closer device spacing.
In conclusion, the physical limitations of wires in the context of Moore's Law include heat management issues, the need for advancements in quantum computing hardware, the challenges of creating functional microscopic transistors, and the ongoing innovations in interconnect technology. These limitations impact the continued exponential growth predicted by Moore's Law.
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Growing costs of energy, cooling, and manufacturing
Moore's Law, an observation made by Gordon Moore in 1965, states that the number of components on a microchip doubles about every two years with minimal cost increase. This law has guided the semiconductor industry in planning and setting targets for research and development. However, as technology continues to advance, the law is facing challenges in terms of energy costs, cooling systems, and manufacturing processes.
Growing costs of energy
The demand for energy consumption increases with technological advancements. To ensure sustainable growth, the tech industry must embrace energy-efficient computing. Energy-efficient technologies can help reduce energy consumption and carbon footprint, leading to a more sustainable future. For example, modern data centers can reduce their energy usage by adopting energy-efficient solutions. Additionally, consumers can save on electricity bills by using energy-efficient devices.
Cooling systems
As components are shrunk to fit more in a small space, cooling becomes a challenge. The higher the number of components in a given space, the hotter it gets, and the harder it is to cool. This issue was already acknowledged by Moore himself in a 2005 interview, where he stated that "we're pushing up against some fairly fundamental limits".
Manufacturing processes
The semiconductor industry has experienced a slowdown in advancements since around 2010, falling slightly below the pace predicted by Moore's Law. The failing Dennard Scaling effect, which describes how transistors use less power as transistor density increases, has resulted in chips using more power and producing more heat. This has led to issues with device overheating and quick battery discharging. As physical limits are approached, manufacturing processes are hitting a wall, and it is becoming harder to deliver the desired power-saving effects.
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The speed of light is finite
Moore's Law, an empirical relationship, states that the number of transistors in an integrated circuit (IC) doubles about every two years. This law has guided the semiconductor industry in long-term planning and setting targets for research and development. However, Moore's Law may be approaching its natural end due to physical limitations.
The impact of the finite speed of light on Moore's Law becomes more pronounced as transistors continue to shrink in size. Transistors have reached the atomic scale, with commercially available transistors measuring only 3 nanometers wide. While there is still potential to make them smaller, doing so becomes increasingly expensive and time-consuming.
The physical limitations imposed by the finite speed of light and the atomic nature of materials present significant challenges to the indefinite continuation of Moore's Law. These limitations affect the ability to further miniaturize transistors and increase computational speed. As a result, the law's prediction of exponential growth in processing power may no longer hold true.
To address these challenges, researchers are exploring alternative methods to improve computer performance beyond the transistor level. This includes advancements in software performance engineering, algorithms, and hardware architecture to enhance system efficiency and speed. Additionally, tools like OpenCilk are being developed to facilitate parallel coding and improve software productivity, correctness, and scalability.
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The law was never meant to last forever
Moore's Law, an empirical relationship that observes that the number of transistors in an integrated circuit (IC) doubles about every two years, was never meant to last forever. Transistors can only get so small, and eventually, the permanent laws of physics become a hindrance. Transistors have already reached the atomic scale, with the smallest ones commercially available only 3 nanometers wide, barely wider than a strand of human DNA.
While there is still room to make them smaller, such progress has become prohibitively expensive and slow, casting reliable gains into doubt. There is also a physical limitation that wires cannot be thinner than atoms, at least not with our current understanding of material physics. As of 2025, the commercially available processor with one of the highest numbers of transistors is a GB202 graphics processor with over 92.2 billion transistors.
The fact that Moore's Law may be approaching its natural end is most evident at chip manufacturers, who are tasked with creating ever-more-powerful chips against the backdrop of physical limitations. Even Intel is competing with itself and its industry to create what may not be possible. In 2014, Intel launched a 14nm chip and struggled to bring a 7nm chip to market.
James R. Powell calculated that due to the uncertainty principle alone, Moore's Law will be obsolete by 2036. Another factor threatening the future of Moore's Law is the growing costs related to energy, cooling, and manufacturing. Building new CPUs or GPUs can be extremely expensive. The cost to manufacture a new 7nm chip is over $500 million.
Moore's Law has been a driving force of technological and social change, productivity, and economic growth. However, it was never meant to last forever, and its potential end has significant implications, especially with the recent frenzy around generative AI and large language models.
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Frequently asked questions
Moore's Law is the observation that the number of transistors in an integrated circuit (IC) doubles about every two years.
Moore's Law was never meant to last forever. Transistors can only get so small and eventually the laws of physics get in the way. Transistors are now measured on an atomic scale, and while there is still room to make them smaller, doing so has become prohibitively expensive and slow.
The end of Moore's Law means that the pace of progress in computing power may slow down. This could have far-reaching implications, especially with the recent developments in generative AI and large language models.
There are several paths that can be taken to advance computational capabilities, such as optical computing and "2D materials". However, these would require completely different methods and processes and would be incompatible with the current silicon industry. Additionally, there is ongoing research in software performance engineering, with proposed solutions in software, algorithms, and hardware architecture that can make systems more efficient and therefore faster.
