Which two companies are well-known producers of CPUs?

The selection of Intel and AMD as the well-known producers of CPUs is appropriate due to their prominent roles in the CPU market. Intel has long been a leader in the development and manufacturing of microprocessors, powering a vast majority of personal computers and servers with its Core and Xeon processor lines. Their innovative technologies and consistent performance have established them as the go-to brand for many consumers and businesses.

AMD, or Advanced Micro Devices, has also been a significant player in the CPU market, particularly noted for its Ryzen and EPYC processors. Over the years, AMD has gained a reputation for offering competitive performance, often at lower price points than Intel, which has attracted many users seeking value and high-performance computing.

In contrast, while companies like VIA do produce CPUs, their market share and impact are not nearly as substantial as that of Intel and AMD. NVIDIA is primarily known for its graphics processing units (GPUs) rather than CPUs, focusing on graphic cards and gaming technology, thus not fitting the question's criteria for well-known CPU manufacturers.