AMD EPYC 9554 vs AMD Ryzen 5 8640HS Comparison

Where Each One Wins

The benchmark data paints an exceptionally lopsided picture. The AMD EPYC 9554 wins every single head-to-head benchmark recorded in the database, with no victories for the Ryzen 5 8640HS across any tested workload. This is not a close contest by any metric.

The EPYC 9554 dominates in multi-threaded scenarios, which aligns with its server positioning. In Cinebench R23 multi-core, the EPYC scores 92,457 against the Ryzen's 11,486, a delta of 705%. Cinebench R15 multi-core shows a 405.1% advantage for the EPYC, scoring 9,319 versus 1,845. These are not incremental gains; they represent a fundamental difference in processing capability for heavily parallel workloads.

Single-thread performance also favors the EPYC 9554, though the margin is more revealing of the architectural gulf between the two parts. In Cinebench R23 single-core, the EPYC scores 13,052 against the Ryzen's 1,711, a 662.8% advantage. The R15 single-core test shows a 390.7% delta, with the EPYC at 1,315 and the Ryzen at 268. It is notably the Ryzen 5 8640HS has a higher boost clock (4.90 GHz versus 3.75 GHz), yet the EPYC still wins every single-threaded test by a massive margin. This indicates that the EPYC's architecture, cache hierarchy, or memory subsystem delivers far superior per-clock performance in the database's recorded tests.

The Ryzen 5 8640HS does have its own strengths in the broader benchmark suite, even if it loses every head-to-head comparison. Its PassMark results show a single-thread score of 3,584, a floating point math score of 39,725, and an integer math score of 68,173. These are respectable numbers for a mobile processor, and its average benchmark score of 26,106 places it in the 78th percentile of all CPUs. The EPYC 9554 sits at the 79th percentile with an average score of 26,743. The percentile gap is razor thin, which suggests that in the full database of CPUs, these two processors occupy nearly identical positions in the overall distribution, despite their wildly different benchmark profiles.

Architecture Differences

Both processors share the Zen 4 architecture, but they diverge dramatically in nearly every other specification. The EPYC 9554 belongs to the EPYC 9004 series with the Genoa codename, while the Ryzen 5 8640HS is part of the 8000 series with the Hawk Point codename. Both are manufactured by TSMC, but on different nodes: the EPYC uses a 5 nm process, while the Ryzen uses a 4 nm process.

The core count difference is the most striking architectural distinction. The EPYC 9554 packs 64 cores and 128 threads, while the Ryzen 5 8640HS has 6 cores and 12 threads. This 10x core advantage explains the massive multi-threaded score differences. The EPYC's transistor count of 52,560 million dwarfs the Ryzen's 25,000 million, and the die configuration differs substantially: the EPYC uses 8x 72 mm² chiplets, while the Ryzen uses a monolithic 178 mm² die.

Cache allocation follows the core count disparity. Both allocate 64 KB of L1 cache per core and 1 MB of L2 cache per core, but the shared L3 cache differs enormously. The EPYC 9554 has 256 MB of shared L3 cache, while the Ryzen 5 8640HS has only 16 MB. This 16x difference in L3 capacity is a major factor in the EPYC's single-threaded dominance, as it can hold far more working data close to the cores.

Memory subsystems are also fundamentally different. The EPYC 9554 supports twelve-channel DDR5 memory with a bandwidth of 460.8 GB/s, while the Ryzen 5 8640HS uses dual-channel DDR5 with 89.6 GB/s of bandwidth. The EPYC also supports ECC memory, while the Ryzen does not. PCIe connectivity differs as well: the EPYC offers Gen 5 with 128 lanes (CPU only), while the Ryzen provides Gen 4 with 20 lanes (CPU only).

The sockets are incompatible: the EPYC uses AMD Socket SP5, while the Ryzen uses AMD Socket FP8. The Ryzen does include integrated graphics in the form of a Radeon 760M, while the EPYC has no integrated graphics. Power envelopes are similarly divergent, with the EPYC rated at 360 W TDP and the Ryzen at 28 W TDP. The EPYC's base clock is 3.10 GHz with a 3.75 GHz boost, while the Ryzen's base clock is 3.50 GHz with a 4.90 GHz boost. Neither processor has an unlocked multiplier.

The Verdict

The data supports a clear conclusion: these processors serve entirely different markets, and the benchmark results reflect that positioning. The EPYC 9554 is a server and workstation processor built for maximum throughput. Its 64 cores, 128 threads, 256 MB of L3 cache, and twelve-channel memory bandwidth make it the obvious choice for anyone running heavily threaded workloads such as large-scale virtualization, scientific computing, or database processing. The 705% advantage in Cinebench R23 multi-core over the Ryzen 5 8640HS is the defining statistic of this comparison.

The Ryzen 5 8640HS is a mobile processor with a 28 W TDP, integrated graphics, and a 4.90 GHz boost clock. Its PassMark results show solid capability in single-threaded tasks, with a score of 3,584, and respectable math performance. But in direct comparison with the EPYC 9554, it loses every recorded benchmark. The Ryzen's advantage is portability and efficiency, not raw compute. Its dual-channel memory and 16 MB of L3 cache are appropriate for a laptop processor, not a server workhorse.

The nearest rival data confirms that both processors sit in the same overall percentile range. The EPYC 9554's closest rivals include the AMD Ryzen 5 5500GT with an average score of 26,748 and a 0% delta, the Intel Core i7-12700H at 26,717 with a 0.1% delta, and the Intel Core i9-11900K at 26,639 with a 0.4% delta. The Ryzen 5 8640HS's closest rivals include the AMD Ryzen 5 8540U at 26,187 with a -0.3% delta, the Intel Core i7-14701TE at 26,013 with a 0.4% delta, and the Intel Core i9-11900KF at 26,212 with a -0.4% delta. The average benchmark scores of 26,743 and 26,106 are separated by only 2.4%, which is remarkable given the core count disparity. The database's average benchmark score weights the processors differently than the head-to-head tests.

Who should pick which? The answer follows the market segment. Server and workstation buyers who need massive parallel throughput should choose the EPYC 9554. Mobile users who need integrated graphics, low power consumption, and a high boost clock should choose the Ryzen 5 8640HS. The benchmark data does not support choosing the Ryzen for raw performance in any tested scenario.

FAQ

Q: Which processor wins in multi-core performance?

A: The AMD EPYC 9554 wins all multi-core tests. In Cinebench R23 multi-core, it scores 92,457 versus the Ryzen 5 8640HS's 11,486, a 705% advantage. In Cinebench R15 multi-core, the EPYC scores 9,319 versus 1,845, a 405.1% delta.

Q: Does the Ryzen 5 8640HS win any benchmark?

A: No. The database records 4 head-to-head benchmark comparisons, and the AMD EPYC 9554 wins all 4. The Ryzen 5 8640HS records 0 wins in the head-to-head tests.

Q: How do the core counts compare?

A: The EPYC 9554 has 64 cores and 128 threads, while the Ryzen 5 8640HS has 6 cores and 12 threads. The EPYC also has 256 MB of shared L3 cache versus the Ryzen's 16 MB.

Q: What is the average benchmark score difference?

A: The EPYC 9554 has an average benchmark score of 26,743, placing it in the 79th percentile of all CPUs. The Ryzen 5 8640HS has an average score of 26,106, placing it in the 78th percentile.

Q: Do both processors use the same architecture?

A: Both use Zen 4, but they are manufactured on different process nodes. The EPYC 9554 uses a 5 nm process, while the Ryzen 5 8640HS uses a 4 nm process. The EPYC has the Genoa codename, and the Ryzen has the Hawk Point codename.

Q: What memory support does each processor offer?

A: The EPYC 9554 supports twelve-channel DDR5 with 460.8 GB/s bandwidth and ECC memory. The Ryzen 5 8640HS supports dual-channel DDR5 with 89.6 GB/s bandwidth and no ECC support.

Head-to-Head Benchmarks

The recorded head-to-head data shows a complete sweep for the AMD EPYC 9554. The largest margin comes in Cinebench R23 multi-core, where the EPYC scores 92,457 against the Ryzen's 11,486. This 705% delta is the single biggest win in the comparison and reflects the 64-core versus 6-core configuration.

Cinebench R23 single-core shows a 662.8% advantage for the EPYC, with a score of 13,052 versus 1,711. This result is particularly notable because the Ryzen has a higher boost clock at 4.90 GHz versus the EPYC's 3.75 GHz, yet the EPYC still dominates. The EPYC's 256 MB of L3 cache and twelve-channel memory bandwidth likely contribute to this outcome.

Cinebench R15 multi-core gives the EPYC a 405.1% win, scoring 9,319 versus 1,845. The R15 single-core test shows the narrowest margin of the four tests, though 390.7% is still a massive gap: 1,315 versus 268.

The Ryzen 5 8640HS does have additional benchmark data beyond the head-to-head tests. In PassMark tests, it records a multithread score of 19,889, a single-thread score of 3,584, integer math at 68,173, floating point math at 39,725, and data encryption at 13,551. In Geekbench, it scores 7,461 multi-core and 1,778 single-core. These numbers show the Ryzen is a capable mobile processor in absolute terms, but the EPYC's head-to-head results are so dominant that no recorded workload favors the Ryzen.

The nearest rival data for each processor provides additional context. The EPYC 9554's closest competitor, the AMD Ryzen 5 5500GT, has an average score of 26,748 with a 0% delta, meaning the EPYC is effectively tied with it in the database's overall average. The Ryzen 5 8640HS's closest rival, the AMD Ryzen 5 8540U, has an average score of 26,187 with a -0.3% delta. Both processors sit near the top of their respective peer groups, yet the head-to-head tests show an unbridgeable performance gap between the server and mobile parts.