How GPU different from CPU ?

 GPUs (Graphics Processing Units) and CPUs (Central Processing Units) are both types of processors, but they are designed to perform different tasks and have different architectural features. Here are some key differences between GPUs and CPUs:

1. Architecture: CPUs are general-purpose processors designed to handle a wide range of tasks. They typically have a few powerful cores optimized for sequential processing. On the other hand, GPUs are specialized processors primarily designed for rendering and manipulating images and graphics. They have a larger number of smaller cores optimized for parallel processing.

2. Parallelism: GPUs excel at performing multiple calculations simultaneously, which is known as parallel processing. They can execute thousands of threads concurrently, making them well-suited for tasks that can be divided into smaller parts that can be processed independently. CPUs, although they also support parallel processing, have a smaller number of cores and are more efficient at handling tasks that require sequential processing.

3. Memory: GPUs have dedicated high-bandwidth memory (VRAM) that is optimized for fast data transfer between the GPU cores and the memory. This is crucial for graphics-intensive applications that require quick access to large amounts of data. CPUs typically have smaller amounts of cache memory that is optimized for fast access to frequently used data but may need to rely on system RAM for larger data sets.

4. Instruction Set: CPUs typically have complex instruction sets that can handle a wide variety of tasks, including arithmetic, logic operations, and branching. They are designed to be flexible and versatile. GPUs have simpler instruction sets tailored for performing calculations on large data sets simultaneously. They are optimized for tasks such as matrix operations, which are commonly used in graphics rendering and machine learning.

5. Use Cases: CPUs are used for general-purpose computing tasks, such as running operating systems, executing software applications, and handling system-level operations. They are well-suited for tasks that require high single-threaded performance and complex decision-making. GPUs, on the other hand, are primarily used for graphics-intensive applications like gaming, video editing, and 3D modeling. They are also widely utilized in machine learning and scientific computing due to their ability to accelerate parallel computations.

It's important to note that the line between CPUs and GPUs has become somewhat blurred in recent years. Modern CPUs have incorporated some features typically found in GPUs, such as integrated graphics processing units (iGPUs). Additionally, GPUs have become more flexible and can now handle certain types of general-purpose computing tasks. This convergence has led to the emergence of hybrid processors like APUs (Accelerated Processing Units), which combine CPU and GPU functionality into a single chip.