Intel® Xeon™ 658X

The Intel Xeon 658X is a workstation processor with 24 cores and 48 threads, built on the Granite Rapids architecture. It launched in Jan 2026. Clocks run from 3.0 GHz base to 4.9 GHz boost. A 144-MB L3 cache backs the cores (8.1 MB per core). It addresses DDR5 memory up to 4 GB across 8 channels. The chip drops into the FCLGA4710 socket and exposes PCIe 5.0 (128 lanes). Rated TDP is 250 W. Notable platform capabilities: AMX, AVX-512, Extended Page Tables (EPT), Control-flow Enforcement (CET).

The Intel Xeon 658X scores 3,709 in single-core performance and 73,583 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 16,520 for overall performance, 53,022 for productivity performance, 47,147 for creator performance, 93,818 for engineering performance and 29,523 for gaming performance. Its multi-core throughput works out to 3,066 per core, 1,533 per thread and 294 per watt. Its computed efficiency index is 1,045. Its performance index is 205, so its overall performance is 105% above the Intel Core i5-12400 (index 100). Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the Intel Xeon 658X scores 264,105 in integer math, 210,316 in floating-point math, 1,061,690 in compression, 52,386 in cryptography, 6,599 in physics simulation, 84,566 in vector SIMD, 650 in the prime sieve and 103,411 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 348% above in integer math, 358% above in floating-point math, 366% above in compression, 356% above in cryptography, 505% above in physics simulation, 445% above in vector SIMD, 870% above in the prime sieve and 357% above in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The Intel Xeon 658X has 24 physical cores and runs 48 logical threads. It does not use a hybrid performance and efficiency core layout. It runs 2 threads per core. It runs at a base clock of 3.00 GHz and boosts up to 4.90 GHz.

The Intel Xeon 658X is a workstation processor, belongs to the Intel Xeon family, uses the Granite Rapids architecture and carries the codename Granite Rapids. It launched in Jan 2026.

The Intel Xeon 658X has 2.63 MB of L1 cache, 48 MB of L2 cache and 144 MB of L3 cache. That adds up to about 194.6 MB of cache, or 8.11 MB per core. Each core has 2 MB of private L2 cache.

The Intel Xeon 658X has a 3-level cache hierarchy: L1 at 2.6 MB, L2 at 48 MB and L3 at 144 MB. L3 is the largest level and makes up about 74% of the cache listed here.

The Intel Xeon 658X supports DDR5 memory, addresses up to 4 GB of memory and uses 8 memory channels. It does not support DDR4 and LPDDR memory.

The Intel Xeon 658X uses the FCLGA4710 socket, supports PCI Express 5.0 and provides up to 128 PCIe lanes.

The Intel Xeon 658X has a rated TDP of 250 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

The Intel Xeon 658X is manufactured by Intel. It launched at a price of $1,869.

The Intel Xeon 658X is also identified by the model number 658X.

Feex has recorded 56% of the specifications it tracks for the Intel Xeon 658X. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Efficiency Cores, All-Core Boost and Unlocked Multiplier. Architecture & Generation: ISA Family and Market Status. Cache: L4 Cache. Memory Support: Memory Bandwidth, ECC Memory and Max Memory Speed. Graphics: Integrated Graphics, Graphics Model, Graphics Base Clock, Graphics Max Clock, Execution Units, Display Outputs and Max Video Memory. Platform & Compatibility: Package and Package Size. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size, Die Count and Foundry. Naming & Aliases: Normalized Name, SKU, Processor Number and Part Number.

Processors that use the same FCLGA4710 socket as the Intel Xeon 658X and have the closest multi-core scores in the Feex database include Intel Xeon 6730P, Intel Xeon 6527P, Intel Xeon 6732P, Intel Xeon 6740E and Intel Xeon 6731P.