Intel® Xeon™ Gold 6421N

The Intel Xeon Gold 6421N is a server processor with 32 cores and 64 threads, built on the Sapphire Rapids architecture. It launched in Jan 2023. Clocks run from 1.8 GHz base to 3.6 GHz boost. A 60-MB L3 cache backs the cores (4.0 MB per core). It addresses DDR5 memory up to 4 GB across 8 channels. The chip drops into the FCLGA4677 socket and exposes PCIe 5.0 (80 lanes). Rated TDP is 185 W. Notable platform capabilities: AMX (Advanced Matrix Extensions), AMX, AVX-512, Extended Page Tables (EPT).

The Intel Xeon Gold 6421N scores 2,978 in single-core performance and 58,797 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 13,232 for overall performance, 42,387 for productivity performance, 37,699 for creator performance, 82,316 for engineering performance and 23,633 for gaming performance. Its multi-core throughput works out to 1,837 per core, 919 per thread and 318 per watt. Its computed efficiency index is 973. Its performance index is 164, so its overall performance is 64% 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 Gold 6421N scores 222,952 in integer math, 158,478 in floating-point math, 813,972 in compression, 49,370 in cryptography, 5,432 in physics simulation, 59,246 in vector SIMD, 306 in the prime sieve and 100,629 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 279% above in integer math, 245% above in floating-point math, 257% above in compression, 330% above in cryptography, 398% above in physics simulation, 282% above in vector SIMD, 357% above in the prime sieve and 344% 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 Gold 6421N has 32 physical cores and runs 64 logical threads. It runs 2 threads per core. It runs at a base clock of 1.80 GHz and boosts up to 3.60 GHz.

The Intel Xeon Gold 6421N is a server processor, belongs to the Intel Xeon Gold family, uses the Sapphire Rapids architecture and carries the codename Sapphire Rapids. It launched in Jan 2023.

The Intel Xeon Gold 6421N has 2.50 MB of L1 cache, 64 MB of L2 cache and 60 MB of L3 cache. That adds up to about 126.5 MB of cache, or 3.95 MB per core. Each core has 2 MB of private L2 cache.

The Intel Xeon Gold 6421N has a 3-level cache hierarchy: L1 at 2.5 MB, L2 at 64 MB and L3 at 60 MB. L2 is the largest level and makes up about 51% of the cache listed here.

The Intel Xeon Gold 6421N 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 Gold 6421N does not include integrated graphics, so a discrete graphics card is required for display output.

The Intel Xeon Gold 6421N uses the FCLGA4677 socket, supports PCI Express 5.0 and provides up to 80 PCIe lanes.

The Intel Xeon Gold 6421N has a rated TDP of 185 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 Gold 6421N is manufactured by Intel. It launched at a price of $2,652.

The Intel Xeon Gold 6421N is also identified by the model number 6421N.

After an audit, 1 value was corrected on the Intel Xeon Gold 6421N record. Each change is listed with its old value, new value, rule and sources.

• PCIe revision: 5 → 5.0. Rule: Cleanup pcie int to decimal. normalize to the dominant "N.0" format.

The audit log is public: all changes for this CPU, the corrections overview and the method.

Feex has recorded 55% of the specifications it tracks for the Intel Xeon Gold 6421N. 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: 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 FCLGA4677 socket as the Intel Xeon Gold 6421N and have the closest multi-core scores in the Feex database include Intel Xeon Gold 6442Y, Intel Xeon w7-3545, Intel Xeon Gold 5420+, Intel Xeon Gold 5512U and Intel Xeon Gold 6542Y.