AMD® EPYC™ 9255

The AMD EPYC 9255 is a server processor with 24 cores and 48 threads, built on the Zen 5 architecture (4 nm process). It launched in Oct 2024. Clocks run from 3.2 GHz base to 4.3 GHz boost. A 128-MB L3 cache backs the cores (6.3 MB per core). It supports DDR5 memory. The chip drops into the SP5 socket and exposes PCIe 5.0. Rated TDP is 200 W. Notable platform capabilities: AVX-512, AMD-V (Hardware Virtualization), AMD SEV.

The AMD EPYC 9255 scores 3,655 in single-core performance and 76,580 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 16,730 for overall performance, 54,894 for productivity performance, 48,698 for creator performance, 97,640 for engineering performance and 30,110 for gaming performance. Its multi-core throughput works out to 3,191 per core, 1,595 per thread and 383 per watt. Its computed efficiency index is 1,183. Its performance index is 207, so its overall performance is 107% 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 9255 scores 306,442 in integer math, 183,367 in floating-point math, 1,018,904 in compression, 59,668 in cryptography, 9,740 in physics simulation, 75,185 in vector SIMD, 580 in the prime sieve and 129,202 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 420% above in integer math, 300% above in floating-point math, 347% above in compression, 419% above in cryptography, 794% above in physics simulation, 385% above in vector SIMD, 766% above in the prime sieve and 470% 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 9255 has 24 physical cores and runs 48 logical threads. It runs 2 threads per core. It runs at a base clock of 3.20 GHz and boosts up to 4.30 GHz.

The AMD EPYC 9255 is a server processor, belongs to the AMD EPYC family, uses the Zen 5 architecture and is manufactured on a 4 nm process. It launched in Oct 2024.

The AMD EPYC 9255 has 80 KB of L1 cache, 24 MB of L2 cache and 128 MB of L3 cache. That adds up to about 152.1 MB of cache, or 6.34 MB per core. Each core has 1 MB of private L2 cache.

The AMD EPYC 9255 has a 3-level cache hierarchy: L1 at 80 KB, L2 at 24 MB and L3 at 128 MB. L3 is the largest level and makes up about 84% of the cache listed here.

The AMD EPYC 9255 supports DDR5 memory, uses 12 memory channels, runs memory at up to 6,400 MT/s and delivers up to 614.4 GB/s of memory bandwidth. It does not support DDR4 and LPDDR memory.

The AMD EPYC 9255 does not include integrated graphics, so a discrete graphics card is required for display output.

The AMD EPYC 9255 uses the SP5 socket and supports PCI Express 5.0.

The AMD EPYC 9255 has a rated TDP of 200 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 AMD EPYC 9255 is manufactured by TSMC. It launched at a price of $2,495.

The AMD EPYC 9255 is also identified by the model number 9255 and the SKU 100-000000694WOF.

Feex has recorded 59% of the specifications it tracks for the AMD EPYC 9255. 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: ECC Memory. 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 and Die Count. Naming & Aliases: Processor Number and Part Number.

Processors that use the same SP5 socket as the AMD EPYC 9255 and have the closest multi-core scores in the Feex database include AMD EPYC 9354, AMD EPYC 9354P, AMD EPYC 9274F, AMD EPYC 9384X and AMD EPYC 9374F.