Intel 5th Gen Emerald Rapids Xeon Platinum 8558P & 8551C 48 Core CPUs Leaked & Benchmarked

Intel’s fifth-generation Xeon Scalable processors marked a significant architectural shift for data centers when they first entered the market. Among the notable models that emerged from early benchmarking databases were the Platinum 8558P and Platinum 8551C, both featuring forty-eight cores. This article reviews the key specifications and performance characteristics of these processors.

Architectural Overview and Platform Compatibility

These processors utilize the LGA 4677 socket to ensure compatibility with the Eagle Stream server platform. The architecture adopts a hybrid design that combines performance cores with efficient cores to balance throughput and power consumption.

Core Configuration and Cache Hierarchy

Both the Platinum 8558P and Platinum 8551C models feature a forty-eight core configuration with ninety-six threads. Initial listings highlighted a distinct cache layout compared to earlier variants in the series. The following breakdown outlines the primary memory hierarchy for these SKUs alongside comparable predecessors.

• Xeon Platinum 8558U: Forty-eight cores, ninety-six threads, 260 MB L3 cache, and 96 MB L2 cache.
• Xeon Platinum 8551C: Forty-eight cores, ninety-six threads, 16 MB L3 cache, and 192 MB L2 cache.
• Xeon Platinum 8468: Forty-eight cores, ninety-six threads, 105 MB L3 cache, and 96 MB L2 cache.

Final production specifications may adjust these memory tiers to optimize performance for diverse server environments. The hybrid core design allows these processors to handle compute-intensive tasks and background services more efficiently than earlier generations.

Clock Speeds and Performance Context

Performance specifications for these models center around balanced clock frequencies. The Platinum 8558P operates with a base clock of 2.70 GHz and a maximum turbo frequency of 3.20 GHz. The Platinum 8551C features a slightly elevated base clock of 2.90 GHz while maintaining the same turbo ceiling. These frequencies support steady performance across virtualization and database workloads.

Early benchmarking comparisons positioned the chips against AMD EPYC Genoa processors. The Emerald Rapids lineup demonstrated measurable improvements over the fourth-generation Sapphire Rapids processors. These results highlighted the competitive landscape of the data center market during that launch cycle.

Legacy and Current Relevance

The Platinum 8558P and 8551C processors remain relevant for organizations managing legacy server infrastructure. They continue to serve as reliable options for specific enterprise applications. Administrators evaluating hardware should consult current Intel documentation to align processor capabilities with modern workload demands.