While it's technically possible to have a motherboard with 3 CPU sockets, it's not a common configuration, especially for consumer-grade hardware. Motherboards supporting multiple CPUs are typically found in server-grade or workstation-class systems.

However, even if your motherboard supports 3 CPUs, there are several factors to consider:

1. CPU Compatibility: Ensure that your motherboard supports the specific CPU models you plan to use. CPUs from different generations or architectures may not be compatible with each other or the motherboard.

2. Operating System Support: Most consumer-grade operating systems, like Windows 10, do not natively support more than 2 CPUs. You would need a server or workstation operating system that can handle multiple CPUs, such as Windows Server or Linux distributions tailored for multi-processor systems.

3. Performance Gains: The performance benefits of using multiple CPUs depend on the workload. Gaming performance is primarily dependent on the GPU, so adding more CPUs may not provide significant gains. Video editing and rendering can benefit from multiple CPUs, but the software you use must be optimized for multi-threading to take advantage of the additional cores.

4. Cost and Complexity: Building a system with 3 CPUs can be expensive, as you need to invest in high-end motherboards, CPUs, and compatible components. It also introduces complexity in terms of cooling, power supply requirements, and system stability.

In most cases, it's more practical and cost-effective to invest in a single, high-performance CPU with multiple cores and threads, rather than using multiple CPUs. Modern CPUs, like the AMD Ryzen or Intel Core series, offer excellent multi-core performance for gaming and content creation tasks.