Intel® Xeon™ 6521P

The Intel Xeon 6521P is a server processor with 24 cores and 48 threads, built on the Granite Rapids architecture. It launched in Jan 2025. Clocks run from 2.6 GHz base to 4.1 GHz boost. A 144-MB L3 cache backs the cores (6.0 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 (136 lanes). Rated TDP is 225 W. Notable platform capabilities: AMX (Advanced Matrix Extensions), AMX, AVX-512, Extended Page Tables (EPT).

The Intel Xeon 6521P scores 3,238 in single-core performance and 66,657 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 14,691 for overall performance, 47,860 for productivity performance, 42,490 for creator performance, 84,988 for engineering performance and 26,378 for gaming performance. Its multi-core throughput works out to 2,777 per core, 1,389 per thread and 296 per watt. Its computed efficiency index is 979. Its performance index is 182, so its overall performance is 82% 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 6521P scores 246,263 in integer math, 178,828 in floating-point math, 967,721 in compression, 51,221 in cryptography, 5,972 in physics simulation, 72,820 in vector SIMD, 560 in the prime sieve and 104,517 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 318% above in integer math, 290% above in floating-point math, 324% above in compression, 346% above in cryptography, 448% above in physics simulation, 370% above in vector SIMD, 736% above in the prime sieve and 361% 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 6521P has 24 physical cores and runs 48 logical threads. It runs 2 threads per core. It runs at a base clock of 2.60 GHz and boosts up to 4.10 GHz.

The Intel Xeon 6521P is a server processor, belongs to the Intel Xeon 6 family, uses the Granite Rapids architecture and carries the codename Granite Rapids. It launched in Jan 2025.

The Intel Xeon 6521P has 144 MB of L3 cache. That adds up to about 144.0 MB of cache, or 6.00 MB per core. Feex has no recorded L1 cache size for this processor.

The Intel Xeon 6521P 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 6521P does not include integrated graphics, so a discrete graphics card is required for display output.

The Intel Xeon 6521P uses the FCLGA4710 socket, supports PCI Express 5.0 and provides up to 136 PCIe lanes.

The Intel Xeon 6521P has a rated TDP of 225 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 6521P is manufactured by Intel. It launched at a price of $1,500.

The Intel Xeon 6521P is also identified by the model number 6521P.

Feex has recorded 51% of the specifications it tracks for the Intel Xeon 6521P. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Performance Cores, Efficiency Cores, Hybrid Architecture, All-Core Boost and Unlocked Multiplier. Architecture & Generation: ISA Family and Market Status. Cache: L1 Cache (Total), L2 Cache (Total), L2 Cache (per Core) and L4 Cache. Memory Support: Memory Bandwidth, ECC Memory and Max Memory Speed. 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 6521P and have the closest multi-core scores in the Feex database include Intel Xeon 656, Intel Xeon 6731P, Intel Xeon 6520P, Intel Xeon 6710E and Intel Xeon 654.