Intel Xeon 6556P-B

The Intel Xeon 6556P-B is a 36-core, 72-thread server processor built on the Granite Rapids architecture and manufactured on Intel's 5 nm process node. It operates within a 215 W TDP, features a base clock of 2.30 GHz and a boost clock of 3.50 GHz, and is positioned as an active production part for the Server/Workstation market segment, with a launch MSRP of $2628.

Single-Thread vs Multi-Thread Behavior

The Xeon 6556P-B presents a clear split between its single-thread and multi-thread capabilities, a distinction that dictates its suitability for various workload types. The processor's base clock of 2.30 GHz and boost clock of 3.50 GHz indicate a design focused on sustained throughput across many cores rather than maximizing per-core frequency extremes. In single-threaded scenarios, the 3.50 GHz boost clock provides a reasonable ceiling, but the architecture's primary strength lies in its aggregate compute capacity.

The multi-threaded behavior is defined by the combination of 36 physical cores and 72 threads via Hyper-Threading, paired with a substantial 144 MB of shared L3 cache. This configuration allows the processor to handle numerous concurrent threads with a large, high-speed data pool, reducing latency when multiple cores access shared datasets. The per-core L2 cache is 2 MB and L1 cache is 112 KB, which supports local data processing before hitting the larger shared L3 pool.

The 50th percentile ranking against all CPUs indicates that the Xeon 6556P-B sits at the median of the entire CPU landscape, but this broad metric does not capture its specific behavior profile. In real workloads, the single-thread performance is sufficient for administrative tasks, light scripting, and managing operating system overhead, but it is not the processor's defining trait. The multi-thread behavior is where the data shows the processor's intended purpose: handling parallelized tasks such as large-scale virtualization, database transaction processing, and scientific simulations that can utilize all 72 threads simultaneously. The 215 W TDP suggests that sustained multi-threaded loads will draw significant power, and the thermal solution must be designed accordingly, but the performance per thread in a heavily parallel environment is the core value proposition.

Who Should Consider It

Based on the benchmark data, the Xeon 6556P-B is engineered for server and workstation environments where multi-threaded throughput is paramount. Workloads that scale across many cores will see the most benefit, as the 36-core/72-thread count directly translates to high parallel execution capacity. Data center operators running containerized microservices, virtualization hosts managing multiple guest operating systems, and enterprise applications with high concurrency demands are the primary audience.

Content creation professionals working with 3D rendering, video encoding, and large-scale data compilation will find the processor advantageous, as these tasks typically exhibit near-linear scaling with core counts. The 144 MB L3 cache helps in scenarios where working sets exceed typical per-core cache sizes, such as in-memory databases or complex analytical queries. The DDR5 memory support with quad-channel configuration and 204.8 GB/s memory bandwidth further supports memory-intensive workloads, ensuring that the CPU cores are fed with data at a rate that keeps them busy.

The processor is less suitable for pure gaming workloads, where single-thread performance and high clock speeds are often the limiting factors. While the 3.50 GHz boost clock is not negligible, the 215 W TDP and server-oriented design make it a poor fit for consumer gaming systems. Office productivity tasks such as word processing, spreadsheets, and web browsing will not leverage the processor's strengths, and the power draw would be wasteful for such light loads. The data suggests a clear directive: choose this processor for multi-threaded server and workstation workloads, and look elsewhere for latency-sensitive or lightly threaded applications.

Benchmark Performance

The benchmark results for the Xeon 6556P-B show a processor with a median standing globally, but the lack of specific benchmark scores and nearest rival data limits the depth of quantitative analysis. The percentileVsAllCpus field indicates a 50th percentile position, meaning half of all CPUs in the database perform better and half perform worse on average. This broad measure is heavily influenced by the vast range of consumer and enterprise processors, and does not isolate the Xeon's performance within its own server-class segment.

Without specific benchmark scores, the assessment relies on architectural parameters. The 3.50 GHz boost clock is modest compared to high-end desktop processors, but the 36-core count and 144 MB L3 cache provide a raw compute advantage in heavily threaded workloads that desktop parts cannot match. The data shows a trade-off: lower per-core frequency and lower single-thread scores are compensated by massive parallel throughput. In multi-threaded benchmarks, the processor would be expected to outperform most consumer CPUs, but without explicit scores, this remains an inference from the core count and cache size.

The memory bandwidth of 204.8 GB/s via quad-channel DDR5 is a critical factor in benchmark performance, particularly for memory-bound workloads. This bandwidth, combined with the 144 MB L3 cache, allows the processor to sustain high data throughput in operations that repeatedly access the same datasets. ECC memory support adds reliability for long-running server workloads where data corruption is unacceptable. The benchmark data does not include comparison scores, so a definitive percentage delta against rivals cannot be stated, but the architectural profile indicates competitive positioning within the server segment for multi-threaded tasks.

How It Compares

The nearestRivals list is empty in the FACT PACK, so a direct comparison against specific competitor models with percentage deltas is not possible. The data provided does not include rival names, scores, or deltaPct values, which precludes a quantitative comparison. In the absence of these figures, the analysis must rely on the processor's own specifications to infer its market position.

The Xeon 6556P-B belongs to the Xeon 6 generation under the Granite Rapids-D codename, indicating it is part of Intel's latest server platform. Within Intel's own lineup, it sits above older Xeon generations in terms of core count and cache size, but without specific rival data, a relative position cannot be quantified. The 5 nm process node suggests a modern manufacturing process that provides efficiency gains over older nodes, but again, no comparative efficiency figures are available.

The processor's socket is Intel BGA 4368, which is a ball-grid array package, indicating a soldered, non-upgradeable installation. This positions it as an OEM or system-integrated component rather than a user-upgradeable retail part. The market segment is explicitly Server/Workstation, which aligns with its 36-core configuration and 215 W TDP. The data shows a processor designed for dense compute environments, but the absence of rival comparisons means the analysis cannot state whether it is ahead or behind its direct competition in specific benchmark scenarios.

FAQ

Q: What is the core and thread count of the Intel Xeon 6556P-B?

A: The processor has 36 cores and 72 threads, enabled by Hyper-Threading technology.

Q: What memory type and configuration does the Xeon 6556P-B support?

A: It supports DDR5 memory in a quad-channel configuration, with a memory bandwidth of 204.8 GB/s and ECC memory support.

Q: What is the processor's socket type and is it user-upgradeable?

A: It uses the Intel BGA 4368 socket, which is a ball-grid array package that is soldered onto the motherboard and not user-upgradeable.

Q: When was the Xeon 6556P-B released?

A: The release date is February 23, 2025.

Q: How much L3 cache does the processor have?

A: It has 144 MB of shared L3 cache, plus 2 MB of L2 cache per core and 112 KB of L1 cache per core.

Q: What is the production status of the Xeon 6556P-B?

A: The production status is Active, and the part number is SRWG2.

Platform and Compatibility

The Xeon 6556P-B is built on the Granite Rapids architecture and uses the Intel BGA 4368 socket, which is a fixed ball-grid array package. This means the processor is soldered directly to the motherboard, eliminating any possibility of user-level upgrade or replacement. The platform is designed for server and workstation motherboards that accommodate this specific socket, and the 215 W TDP requires robust cooling solutions and power delivery systems.

Memory support is limited to DDR5 in a quad-channel configuration, providing a memory bandwidth of 204.8 GB/s. The system supports ECC memory, which is essential for data integrity in server environments where memory errors can lead to corruption or crashes. The memory controller is integrated into the processor, and the quad-channel design allows for high throughput, though the exact number of DIMM slots and maximum capacity is not specified in the data.

For expansion, the processor provides PCIe Gen 5 with 32 lanes available from the CPU. This supports high-speed peripheral connections such as NVMe storage, network adapters, and GPU accelerators, though the lane count is modest for a server processor, suggesting a focus on balanced I/O rather than extreme expansion. The architecture is Granite Rapids, which is part of the Xeon 6 generation, and the process node is 5 nm from Intel's foundry, with a die size of 598 mm². The upgrade path is limited to the initial system purchase, as the BGA socket precludes swapping processors. The production status is Active, indicating ongoing availability, and the launch MSRP is $2628, though system integrators and OEMs would determine final platform costs.