Technology
Understanding Hyperthreading on AMD Ryzen Processors
Introduction
When discussing Intel's processors, it is common to come across the term ‘hyperthreading’ which is a form of simultaneous multi-threading (SMT). However, when it comes to AMD Ryzen processors, the term 'hyperthreading' is not commonly used. This article provides a detailed explanation of how hyperthreading or SMT works on AMD Ryzen processors, highlighting the differences and similarities with Intel's implementation.
What is Hyperthreading or SMT?
Hyperthreading is Intel's proprietary term for SMT (Simultaneous Multithreading). SMT is a technique that allows a single physical core to handle multiple threads, effectively increasing the processor's efficiency. This is achieved by interleaving the execution of threads in a way that maximizes the utilization of the core resources. Although AMD uses the term 'SMT' instead of 'hyperthreading,' both refer to the same concept of multi-threading.
Ryzen Processors and Simultaneous Multithreading
Amd Ryzen processors are part of a family of multiple different CPUs, with some supporting SMT and others not. For instance, the Ryzen 5 350 is a six-core CPU without hyperthreading, meaning it has six threads. In contrast, a Ryzen 5 1600 has SMT and therefore 12 threads.
Common Ryzen Processors Without Hyperthreading
Ryzen 3 2200G - A single-threaded quad-core processor with no hyperthreading. Ryzen 3 230 - A four-core CPU with no SMT, thus four threads.Common Ryzen Processors With Hyperthreading
Ryzen 5 1600 - A six-core CPU with SMT, hence twelve threads. Ryzen 5 350 - A six-core CPU with SMT, hence twelve threads. Ryzen 5000-series processors - All have SMT/hyperthreading.Intel vs. AMD: Hyperthreading Terminology
The term 'hyperthreading' is more commonly associated with Intel processors, leading to a situation where AMD processors that support SMT do not explicitly mention 'hyperthreading'. This is primarily due to legal reasons, similar to how Intel named its successor to the 80486 as the 'Pentium' to avoid copyright issues.
The K5, a competitor from AMD, and the Cx6x86 from Cyrix, were both drop-in replacements for the Intel Pentium, but they also faced similar naming restrictions. AMD calls SMT by its technical term 'SMT' to avoid legal conflicts with Intel's proprietary term.
Conclusion
While hyperthreading or SMT is a crucial feature for many modern processors, it's important to understand that the terminology used can differ between manufacturers. AMD's Ryzen processors might not explicitly mention 'hyperthreading,' but they indeed support SMT, providing a way to handle multiple threads simultaneously and maximize processing efficiency.