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Intel Xeon Platinum 8558U specifications and in-depth review

Intel Xeon Platinum 8558U

Manufacturer: Intel

The Intel Xeon Platinum 8558U is a high core-count server processor designed for enterprise workloads that demand broad parallelism and large memory capacity. It operates across 48 cores at a base frequency of 2 GHz, exposing 96 threads for concurrent execution, with Turbo Boost 2 capable of pushing clock speeds up to 4 GHz when thermal conditions permit. The chip carries no integrated graphics, functioning strictly as a compute-focused component within managed server and data center infrastructure.

On the technical side, the Xeon Platinum 8558U operates within a 300W Thermal Design Power envelope and supports a maximum CPU temperature of 95 °C. Its memory subsystem is built around eight channels of DDR5 at up to 5200 MHz, with a peak bandwidth of 307.2 GB/s, full ECC support, and a total addressable memory ceiling of 4000 GB. The processor carries a notably large 260 MB L3 cache — approximately 5.42 MB per core — which provides substantial low-latency data storage close to the compute fabric. PCIe 5 connectivity, a locked clock multiplier of 20, and a broad instruction set spanning AVX2, AES, FMA3, SSE 4.1, SSE 4.2, and more round out its technical profile.

Pros
  • 48 cores and 96 threads provide extensive parallel processing capacity for highly concurrent enterprise workloads
  • A 260 MB L3 cache at 5.42 MB per core is a notably large allocation that keeps substantial working data within low-latency reach of the compute units
  • Eight-channel DDR5 memory support with a peak bandwidth of 307.2 GB/s sustains the data throughput requirements of a high core-count server processor
  • ECC memory support enables hardware-level error detection and correction, reinforcing data integrity for continuous server operation
  • Support for up to 4000 GB of addressable memory accommodates large in-memory datasets and dense virtualization environments
  • Native instruction set coverage including AES, AVX2, and FMA3 enables hardware-accelerated encryption, vectorized arithmetic, and fused multiply-add operations
Cons
  • A base clock speed of 2 GHz is low for workloads where sequential execution speed has a direct impact on latency or response time
  • The 300W TDP places significant demands on server power infrastructure and cooling systems, requiring purpose-built server chassis
  • The clock multiplier is locked, leaving no ability to tune frequency behavior beyond factory-defined parameters
  • No integrated graphics means a discrete display solution or dedicated remote management hardware is required for any visual output
  • Turbo Boost is limited to version 2, which applies a conservative approach to frequency scaling under boost conditions
Who is this for?

The Intel Xeon Platinum 8558U is well-matched to enterprise data center environments where high core-count parallel processing is the central demand, such as large-scale virtualization platforms, high-performance computing clusters, and workloads that can effectively distribute execution across 96 threads. Its 260 MB L3 cache makes it particularly suited to compute tasks where keeping large working datasets in low-latency storage close to the cores has a meaningful impact on throughput. Organizations running memory-intensive server applications will also benefit from the platform's eight-channel DDR5 subsystem with ECC support and a 4000 GB memory ceiling, which provides both the capacity and reliability expected in mission-critical deployments.

Who is this NOT for?

This processor is not a practical fit for workloads where single-threaded or low-latency sequential performance is the primary concern, as its 2 GHz base clock reflects a design philosophy centered on broad parallelism rather than per-core speed. The 300W TDP and complete absence of integrated graphics mean the chip requires purpose-built server infrastructure with dedicated power delivery, thermal management, and separate remote management or display hardware — making it entirely unsuitable outside of properly provisioned data center chassis. Environments with constrained rack power budgets or cooling capacity will find the platform's thermal requirements difficult to accommodate without significant infrastructure investment.

General info:

Thermal Design Power (TDP) 300W
semiconductor size 10 nm
PCI Express (PCIe) version 5
Supports 64-bit ✓
CPU temperature 95 °C
Has integrated graphics ✕

The Intel Xeon Platinum 8558U carries a Thermal Design Power (TDP) of 300W and a maximum operating temperature of 95 °C, setting the thermal boundaries for its operation within server-class infrastructure. It is manufactured on a 10 nm semiconductor process and supports 64-bit computing throughout its feature set. Platform connectivity is delivered via PCIe 5, enabling high-bandwidth interfacing with compatible server components. Integrated graphics are not present, which is in keeping with the processor's role as a dedicated compute unit in enterprise and data center deployments.

Performance:

CPU speed 48 x 2 GHz
CPU threads 96 threads
turbo clock speed 4GHz
L3 cache 260 MB
clock multiplier 20
Has an unlocked multiplier ✕
L3 core 5.42 MB/core
Turbo Boost version 2

The processor runs across 48 cores at a base clock of 2 GHz, with a clock multiplier of 20, delivering 96 threads for broad parallel workload execution. Turbo Boost version 2 allows frequencies to reach 4 GHz under favorable thermal and power conditions, providing a meaningful step up from the base speed for tasks that benefit from higher per-core throughput. The multiplier is locked and operates strictly within its factory-set parameters. Cache is a standout aspect of this chip, with a total of 260 MB of L3 cache distributed at 5.42 MB per core — a notably large allocation that keeps substantial amounts of frequently accessed data within low-latency reach of the compute cores.

Memory:

Supports ECC memory ✓
maximum memory bandwidth 307.2 GB/s
DDR memory version 5
RAM speed (max) 5200 MHz
maximum memory amount 4000GB
memory channels 8

The processor supports DDR5 memory across eight channels, with RAM speeds reaching up to 5200 MHz and a peak memory bandwidth of 307.2 GB/s, providing the throughput needed to keep a 48-core chip's compute capacity adequately fed. The platform can address up to 4000 GB of total memory, offering substantial headroom for workloads that rely on large in-memory datasets or dense multi-tenant virtualization. ECC memory support is included, enabling hardware-level detection and correction of memory errors to help maintain data integrity in continuous enterprise and data center operation.

Features:

uses multithreading ✓
instruction sets MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, SSE 4.2
Has NX bit ✓

The processor supports multithreading, enabling each of its 48 physical cores to handle two threads simultaneously, which increases the total thread count available for parallel workload distribution. The NX bit is also present, providing a hardware-enforced boundary between executable code and data regions in memory as a defense against certain classes of software exploits. In terms of instruction set coverage, the chip supports MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2, collectively enabling native acceleration for tasks ranging from vectorized floating-point arithmetic and fused multiply-add operations to hardware-level encryption — a range well-suited to the varied compute demands of enterprise server workloads.

Benchmarks:

Final Verdict

The Intel Xeon Platinum 8558U makes a clear and focused case for itself as a large-scale enterprise compute processor, with its defining characteristic being the combination of 48 cores, 96 threads, and a 260 MB L3 cache at 5.42 MB per core — an unusually generous cache allocation that meaningfully supports throughput-intensive parallel workloads. Backed by eight-channel DDR5 memory with ECC support and a 4000 GB capacity ceiling, the platform is well-equipped for data center environments where memory bandwidth and reliability are non-negotiable. Its 300W thermal envelope and locked multiplier make it a processor that operates within strict infrastructure requirements, and it rewards organizations that can meet those requirements with a technically coherent platform for high-concurrency enterprise workloads. For data center operators deploying demanding server applications at scale, the Xeon Platinum 8558U represents a well-defined and purposefully engineered option within the enterprise CPU segment.

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