AMD® EPYC™ 7643

The AMD EPYC 7643 is a server processor with 48 cores and 96 threads, built on the Zen 3 architecture. It launched in Mar 2021. Clocks run from 2.3 GHz base to 3.6 GHz boost. A 256-MB L3 cache backs the cores (5.9 MB per core). It supports DDR4 memory. Rated TDP is 225 W. Notable platform capabilities: AMD-V (Hardware Virtualization), AMD SEV.

The AMD EPYC 7643 scores 2,690 in single-core performance and 76,259 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 14,323 for overall performance, 53,334 for productivity performance, 46,784 for creator performance, 106,763 for engineering performance and 27,135 for gaming performance. Its multi-core throughput works out to 1,589 per core, 794 per thread and 339 per watt. Its computed efficiency index is 955. Its performance index is 178, so its overall performance is 78% 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 AMD EPYC 7643 scores 389,093 in integer math, 224,756 in floating-point math, 1,272,425 in compression, 80,683 in cryptography, 7,143 in physics simulation, 81,268 in vector SIMD, 638 in the prime sieve and 136,969 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 561% above in integer math, 390% above in floating-point math, 458% above in compression, 602% above in cryptography, 555% above in physics simulation, 424% above in vector SIMD, 852% above in the prime sieve and 505% 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 AMD EPYC 7643 has 48 physical cores and runs 96 logical threads. It runs 2 threads per core. It runs at a base clock of 2.30 GHz and boosts up to 3.60 GHz.

The AMD EPYC 7643 is a server processor, belongs to the AMD EPYC family and uses the Zen 3 architecture. It launched in Mar 2021.

The AMD EPYC 7643 has 3 MB of L1 cache, 24 MB of L2 cache and 256 MB of L3 cache. That adds up to about 283.0 MB of cache, or 5.90 MB per core. Each core has 512 KB of private L2 cache.

The AMD EPYC 7643 has a 3-level cache hierarchy: L1 at 3 MB, L2 at 24 MB and L3 at 256 MB. L3 is the largest level and makes up about 90% of the cache listed here.

The AMD EPYC 7643 supports DDR4 memory and uses 8 memory channels. It does not support DDR5 and LPDDR memory.

The AMD EPYC 7643 does not include integrated graphics, so a discrete graphics card is required for display output.

The AMD EPYC 7643 supports PCI Express 4.0.

The AMD EPYC 7643 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.

Feex has recorded 46% of the specifications it tracks for the AMD EPYC 7643. 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: Codename, ISA Family and Market Status. Cache: L4 Cache. Memory Support: Memory Bandwidth, ECC Memory and Max Memory Speed. Platform & Compatibility: Package, Package Size and PCIe Lanes. 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, Foundry and Launch Price. Naming & Aliases: Normalized Name, SKU, Model Number, Processor Number and Part Number.

Processors close to the AMD EPYC 7643 in the Feex database, matched by socket, family, segment, architecture, core count, TDP and benchmark scores, include AMD EPYC 9455 Emb, AMD EPYC 9455P, AMD EPYC 9475F, AMD EPYC 9654P and AMD EPYC 9535.