The processors AMD EPYC 9645 They are a very powerful and efficient option for web servers, especially those requiring high processing capacity and handling of large volumes of requests. They belong to AMD's EPYC 9005 series, designed specifically for high-performance server environments.

Here I detail their key features and why they are suitable for web servers:

• Cores and Threads: The EPYC 9645 features 96 CPU cores and 192 threads. This large number of cores allows the server to handle multiple tasks and requests concurrently, which is essential for high-traffic web environments where numerous requests are processed simultaneously.
• Clock Speed: It operates at a base frequency of 2.3 GHz and can reach a turbo frequency of up to 3.7 GHz, adjusting to the workload. This ensures that the processor can respond quickly to both routine tasks and peak demands.
• L3 Cache: It incorporates a generous 256MB L3 cache. A large cache is crucial for server performance, as it reduces the time the processor takes to access frequently used data, speeding up database operations and content delivery.
• Memory: It supports DDR5 memory with 12 channels, with speeds up to 6400 MT/s. DDR5 compatibility and a large number of memory channels mean significantly higher memory bandwidth, which is vital for memory-intensive applications such as large databases or caching services.
• PCI Express Connectivity: It features 128 PCI Express 5.0 (PCIe 5.0) lanes. PCIe 5.0 offers twice the bandwidth of PCIe 4.0, enabling extremely fast communication with other server components, such as high-speed NVMe storage drives or 100GbE or higher network cards, reducing data transfer bottlenecks.
• Manufacturing Technology: It is manufactured using a 3nm process. A smaller manufacturing process generally translates to greater energy efficiency and better performance per watt, which is beneficial for reducing operating costs in data centers.

Advantages for Web Servers:

• Efficient Multitasking: The large number of cores and threads allows the web server to handle a large number of client connections, run PHP processes, database queries, and other web server tasks without slowdowns.
• Database Performance: The combination of high speed, large L3 cache, and support for 12-channel DDR5 memory directly benefits databases (such as MariaDB 11.4.4, which you mentioned), accelerating data reading and writing.
• Scalability: With 192 threads, these processors are well positioned to scale and handle the growth in traffic and complexity of web applications.
• Energy Efficiency: The 3nm technology contributes to lower power consumption relative to performance, which can result in lower cooling and electricity costs in a data center.
• High Connectivity: PCIe 5.0 connectivity is ideal for servers that use high-speed NVMe storage for databases or caching systems, and for high-speed networks that handle large volumes of traffic.

There are already companies offering VPS (Virtual Private Server) lines based on the AMD EPYC 9645, highlighting their performance.

In summary, the AMD EPYC 9645 is a high-end processor that delivers exceptional performance in terms of processing power, memory management, and I/O connectivity, making it a very solid choice for web servers looking to maximize efficiency and responsiveness, especially for high-traffic WordPress sites or demanding web applications.