CPU Comparison

The AMD EPYC 9254 dominates this comparison, winning every head-to-head benchmark by a massive margin. The Ryzen 5 40 is a low-power mobile part, while the EPYC 9254 is a 24-core server processor; the data shows a performance chasm that defines their entirely separate use cases. The EPYC 9254’s smallest victory in the shared tests is a 78.6% lead in Cinebench R15 single-core, and its largest is a 91.1% lead in Cinebench R23 multi-core. The Ryzen 5 40’s only statistical claim is a near-identical average benchmark score relative to its own rivals, not to the EPYC.

Where Each One Wins

The AMD EPYC 9254 wins every single benchmark category where both processors have data. In multi-threaded workloads, the gap is staggering: the EPYC 9254 scores 54,473 in Cinebench R23 multi-core versus 4,841 for the Ryzen 5 40, a 91.1% deficit for the latter. This is not a close contest; it is a category difference. The EPYC’s 24 cores and 48 threads, combined with 128 MB of shared L3 cache, make it a clear leader for server virtualization, database workloads, and heavy compilation tasks. The Ryzen 5 40’s 4 cores and 8 threads place it in an entirely different performance tier.

Even in single-threaded tests, where core count matters less, the EPYC 9254 wins decisively. It scores 7,690 in Cinebench R23 single-core versus 1,150 for the Ryzen 5 40, an 85% lead. This indicates the EPYC’s Zen 4 architecture has a significant per-core instruction throughput advantage over the Ryzen’s Zen 2 design. The Ryzen 5 40 does not win any benchmark in the head-to-head data. Its only notable position is its 70th percentile ranking among all CPUs, which is actually one point higher than the EPYC’s 69th percentile, but this is an artifact of comparing across entirely different benchmark suites rather than a direct performance win.

The Ryzen 5 40’s domain is efficiency and mobility, not raw throughput. Its 15 W TDP and integrated Radeon 610M graphics make it suitable for fanless or passively cooled laptops. The EPYC 9254, with a 200 W TDP and no integrated graphics, is designed for rack-mounted servers with dedicated cooling and discrete GPUs. The Ryzen 5 40’s LPDDR5 memory support and dual-channel bus indicate a focus on low-power, compact systems, whereas the EPYC’s DDR5 with twelve-channel support and 460.8 GB/s bandwidth targets memory-bandwidth-hungry enterprise applications.

The Verdict

The verdict is unambiguous: choose the AMD EPYC 9254 for any workload that requires maximum compute throughput. Benchmark results show it outperforms the Ryzen 5 40 by 85% to 91% across all shared Cinebench tests. This is the processor for server racks, cloud infrastructure, and heavy scientific computing. Its 24 cores, 48 threads, and 128 MB L3 cache provide the parallel processing headroom that the 4-core Ryzen 5 40 cannot approach. The EPYC’s 460.8 GB/s memory bandwidth and 128 PCIe Gen 5 lanes further solidify its position as a data-center workhorse.

Pick the AMD Ryzen 5 40 only if the workload is constrained by power and physical space. Its 15 W TDP is a fraction of the EPYC’s 200 W, and its AMD Socket FT6 form factor is designed for thin-and-light mobile devices. The integrated Radeon 610M GPU eliminates the need for a discrete graphics card in basic systems. However, the data shows no scenario where the Ryzen 5 40 wins a performance benchmark against the EPYC 9254. The Ryzen’s 70th percentile ranking versus the EPYC’s 69th is a statistical tie in overall standings, but this is misleading; direct comparisons show a total wipeout.

For buyers, the decision is simple. If you need a server CPU, the EPYC 9254 is the only choice between these two. If you need a mobile processor, the Ryzen 5 40 is the only one that fits, but you are sacrificing roughly 85-91% of multi-core performance compared to the EPYC. There is no middle ground. The EPYC 9254 has a launch MSRP of $2299, which reflects its enterprise positioning, while the Ryzen 5 40 has no listed launch price.

Head-to-Head Benchmarks

The Cinebench R23 multi-core test shows the largest gap. The EPYC 9254 scores 54,473, while the Ryzen 5 40 scores 4,841. This is a 91.1% difference, meaning the EPYC delivers over 11 times the multi-core score. The EPYC’s 24 cores versus 4 cores explain this, but the magnitude is still striking. For context, the EPYC’s score is more than double that of its nearest rival, the AMD EPYC 9334, which averages 15,940 in overall score, though that rival metric is not directly comparable to the Cinebench test.

In Cinebench R15 multi-core, the EPYC 9254 scores 5,490 versus 790 for the Ryzen 5 40, an 85.6% lead. This older benchmark still shows the same pattern: the EPYC’s parallel scaling crushes the Ryzen’s modest 4-core design. Single-core results are closer in percentage terms but still lopsided. Cinebench R23 single-core shows 7,690 for the EPYC versus 1,150 for the Ryzen, an 85% lead. Cinebench R15 single-core shows 774 versus 165.5, a 78.6% lead. The EPYC’s Zen 4 architecture, built on a 5 nm process, delivers substantially higher instructions per clock than the Ryzen’s Zen 2 on 6 nm.

Notably, the Ryzen 5 40 has PassMark scores for data compression (141,533), encryption (6,646), and integer math (31,598), but the EPYC 9254 has no corresponding PassMark data in this comparison. The absence of these tests for the EPYC means we cannot compare those workloads directly. However, the four Cinebench tests that do overlap all favor the EPYC by overwhelming margins. The head-to-head tally is 4 wins for the EPYC and 0 for the Ryzen.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 9254 has 24 cores and 48 threads. The AMD Ryzen 5 40 has 4 cores and 8 threads.

Q: What is the performance difference in multi-core workloads?

A: In Cinebench R23 multi-core, the EPYC 9254 scores 54,473 versus 4,841 for the Ryzen 5 40, a 91.1% difference. In Cinebench R15 multi-core, the EPYC scores 5,490 versus 790, an 85.6% difference.

Q: Does the Ryzen 5 40 win any benchmark against the EPYC 9254?

A: No. In the four head-to-head benchmarks (Cinebench R15 and R23, both single and multi-core), the EPYC 9254 wins all four. The Ryzen 5 40 has zero wins.

Q: What are the single-core performance differences?

A: The EPYC 9254 scores 7,690 in Cinebench R23 single-core versus 1,150 for the Ryzen 5 40, an 85% lead. In Cinebench R15 single-core, the EPYC scores 774 versus 165.5, a 78.6% lead.

Q: Which processor has a higher average benchmark score relative to all CPUs?

A: The Ryzen 5 40 ranks in the 70th percentile versus the EPYC 9254’s 69th percentile. However, this is based on different benchmark suites and does not reflect direct head-to-head performance, where the EPYC wins every test.

Q: What are the memory and expansion differences?

A: The EPYC 9254 supports DDR5 memory with a twelve-channel bus and 460.8 GB/s bandwidth, plus 128 PCIe Gen 5 lanes. The Ryzen 5 40 supports LPDDR5 with a dual-channel bus and 88.0 GB/s bandwidth, plus 4 PCIe Gen 3 lanes.

Architecture Differences

The two processors come from different architectural generations and design philosophies. The AMD Ryzen 5 40 uses the Zen 2 architecture, codenamed Mendocino, built on a 6 nm process at TSMC. The AMD EPYC 9254 uses the Zen 4 architecture, codenamed Genoa, built on a 5 nm process, also at TSMC. The EPYC’s die is composed of 4x 72 mm² chiplets, totaling 26,280 million transistors, whereas the Ryzen 5 40 has a single 100 mm² die with no transistor count listed.

Cache configurations differ dramatically. Both have 64 KB of L1 per core, but the EPYC 9254 has 1 MB of L2 per core versus 512 KB for the Ryzen 5 40. The L3 cache is the biggest divergence: the EPYC has 128 MB shared, while the Ryzen 5 40 has only 4 MB shared. This 32x difference in L3 capacity directly impacts server workloads that rely on large working sets resident in cache.

The EPYC 9254 is built for the SP5 socket and supports ECC memory, while the Ryzen 5 40 uses the FT6 socket and lacks ECC support. The EPYC’s memory bus is twelve-channel DDR5 with 460.8 GB/s bandwidth, compared to the Ryzen’s dual-channel LPDDR5 at 88.0 GB/s. The EPYC also has 128 PCIe Gen 5 lanes, versus 4 PCIe Gen 3 lanes for the Ryzen. The Ryzen 5 40 includes integrated Radeon 610M graphics, while the EPYC has no integrated graphics.

Specification Differences

The following table highlights only the fields where the two processors differ. The Ryzen 5 40 has 4 cores and 8 threads, while the EPYC 9254 has 24 cores and 48 threads. The Ryzen’s base clock is 2.80 GHz and boost clock is 4.30 GHz; the EPYC’s base clock is 2.90 GHz and boost clock is 4.15 GHz. The Ryzen has a 15 W TDP, the EPYC has a 200 W TDP. Sockets differ: AMD Socket FT6 for the Ryzen, AMD Socket SP5 for the EPYC. The Ryzen is Zen 2 (Mendocino), the EPYC is Zen 4 (Genoa). Process nodes are 6 nm versus 5 nm. Die size is 100 mm² versus 4x 72 mm². The EPYC lists 26,280 million transistors; the Ryzen does not.

L2 cache is 512 KB per core for the Ryzen versus 1 MB per core for the EPYC. L3 cache is 4 MB shared versus 128 MB shared. Memory support is LPDDR5 versus DDR5. Memory bus is dual-channel versus twelve-channel. Memory bandwidth is 88.0 GB/s versus 460.8 GB/s. ECC memory is false for the Ryzen, true for the EPYC. PCIe is Gen 3 with 4 lanes versus Gen 5 with 128 lanes. The Ryzen has integrated Radeon 610M graphics; the EPYC has none. Market segments are Mobile versus Server/Workstation. Release dates are 2025-09-30 for the Ryzen and 2022-11-09 for the EPYC. The EPYC has a launch MSRP of $2299; the Ryzen has none. Part numbers differ: unknown versus 100-100000480. Both have locked multipliers and are Active in production.