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It is useful to understand how they work to appreciate the importance of these computational units specialized for matrix multiplication. That is why I only recommend GPUs with Tensor Cores. There are now enough cheap GPUs that almost everyone can afford a GPU with Tensor Cores. The only bottleneck is getting data to the Tensor Cores.

Tensor Cores are so fast that computation is no longer a bottleneck.

Tensor Cores reduce the reliance on repetitive shared memory access, thus saving additional cycles for memory access.

Tensor Cores reduce the used cycles needed for calculating multiply and addition operations, 16-fold - in my example, for a 32Г—32 matrix, from 128 cycles to 8 cycles.

This understanding will help you to evaluate future GPUs by yourself.

This section can help you build a more intuitive understanding of how to think about deep learning performance. The Most Important GPU Specs for Deep Learning Processing Speed If we look at the details, we can understand what makes one GPU better than another. This is a high-level explanation that explains quite well why GPUs are better than CPUs for deep learning. The best high-level explanation for the question of how GPUs work is my following Quora answer: Read Tim Dettmers' answer to Why are GPUs well-suited to deep learning? on Quora You can skip this section if you just want the useful performance numbers and arguments to help you decide which GPU to buy.

In turn, you might be able to understand better why you need a GPU in the first place and how other future hardware options might be able to compete. This knowledge will come in handy in understanding why GPUs might be slow in some cases and fast in others. If you use GPUs frequently, it is useful to understand how they work. After that follows a Q&A section of common questions posed to me in Twitter threads in that section, I will also address common misconceptions and some miscellaneous issues, such as cloud vs desktop, cooling, AMD vs NVIDIA, and others. From there, I make GPU recommendations for 1-2, 4, 8 GPU setups, and GPU clusters.

I discuss the unique features of the new NVIDIA RTX 30 Ampere GPU series that are worth considering if you buy a GPU. Then I will make theoretical estimates for GPU performance and align them with some marketing benchmarks from NVIDIA to get reliable, unbiased performance data. These explanations might help you get a more intuitive sense of what to look for in a GPU. I will discuss CPUs vs GPUs, Tensor Cores, memory bandwidth, and the memory hierarchy of GPUs and how these relate to deep learning performance. First, I will explain what makes a GPU fast. This blog post is structured in the following way. I will head each major section with a small summary, which might help you to decide if you want to read the section or not. You might want to skip a section or two based on your understanding of the presented topics. (3) If you want to get an in-depth understanding of how GPUs and Tensor Cores work, the best is to read the blog post from start to finish. (2) If you worry about specific questions, I have answered and addressed the most common questions and misconceptions in the later part of the blog post. These form the core of the blog post and the most valuable content. You have the choice: (1) If you are not interested in the details of how GPUs work, what makes a GPU fast, and what is unique about the new NVIDIA RTX 30 Ampere series, you can skip right to the performance and performance per dollar charts and the recommendation section. This blog post is designed to give you different levels of understanding of GPUs and the new Ampere series GPUs from NVIDIA. But what features are important if you want to buy a new GPU? GPU RAM, cores, tensor cores? How to make a cost-efficient choice? This blog post will delve into these questions, tackle common misconceptions, give you an intuitive understanding of how to think about GPUs, and will lend you advice, which will help you to make a choice that is right for you. Deep learning is a field with intense computational requirements, and your choice of GPU will fundamentally determine your deep learning experience.

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