AMD EPYC 4584PX vs AMD Ryzen 9 8945HX Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive overall victory for the AMD EPYC 4584PX, which wins 15 of the 17 head-to-head benchmark comparisons. The margin is not uniform across workloads, however. In the Cinebench suite, the EPYC 4584PX is consistently about 20.6% ahead in both single-core and multi-core tests. Specifically, Cinebench R23 multi-core shows 51,524 points versus 42,713 for the Ryzen 9 8945HX, a 20.6% advantage. Single-core R23 tells the same story: 7,274 versus 6,030, again a 20.6% gap. The R15 and R20 results mirror this pattern, with deltas of 20.6% to 20.8% across all four tests.

The largest single victory for the EPYC 4584PX comes in PassMark physics, where it scores 4,574 against 2,168, a massive 111% lead. This is the standout outlier in the dataset. The find prime numbers test also shows a substantial gap, with 441 versus 262, a 68.3% difference. These two workloads reward the EPYC's higher boost clock and larger cache configuration.

Other PassMark tests show smaller but still positive margins for the EPYC 4584PX. Data compression comes in at 741,648 versus 677,755, a 9.4% lead. Data encryption shows 45,902 versus 40,836, a 12.4% advantage. Extended instructions are 7.9% ahead at 53,774 versus 49,823. Random string sorting favors the EPYC by 11.3%, at 87,690 versus 78,781. Multi-threaded performance is 13.1% higher at 58,117 versus 51,405. Floating point math is nearly a tie, with the EPYC leading by only 3.4% at 121,460 versus 117,453. Integer math is similarly close, at 3.5% ahead with 201,919 versus 195,180.

The Ryzen 9 8945HX manages to win only one unique test category, PassMark single-thread, where it scores 3,907 versus 3,795. That is a 2.9% margin in favor of the mobile chip. This is notable because it is the only benchmark in the entire set where the Ryzen 9 8945HX is ahead, and it is a relatively narrow lead compared to the EPYC's advantages elsewhere.

Architecture Differences

Both processors are built on the same Zen 4 architecture and use the same 5 nm process node from TSMC. They share the same dual-die configuration with a die size of 2x 71 mm². The similarities end there in several important ways. The EPYC 4584PX is part of the EPYC 4004 series, codenamed Raphael, and is designed for the server and workstation market segment. It uses AMD Socket AM5 and carries a TDP of 120 watts. The Ryzen 9 8945HX belongs to the 8000 series, codenamed Dragon Range, targets the mobile segment, uses AMD Socket FL1, and has a TDP of just 55 watts.

The transistor counts differ meaningfully. The EPYC 4584PX contains 17,840 million transistors, while the Ryzen 9 8945HX contains 13,140 million. This is a significant structural difference that helps explain the EPYC's performance advantages. Clock speeds also differ. The EPYC 4584PX has a base clock of 4.20 GHz and a boost clock of 5.70 GHz. The Ryzen 9 8945HX has a base clock of 2.50 GHz and a boost clock of 5.40 GHz. The EPYC's base clock is substantially higher, which contributes to its strong showing in sustained multi-threaded workloads.

Cache configuration is another major differentiator. Both chips have 64 KB of L1 and 1 MB of L2 per core. The L3 cache, however, is very different. The EPYC 4584PX has 128 MB of shared L3 cache and includes a 1x 64 MB 3D V-Cache slice. The Ryzen 9 8945HX has only 64 MB of L3 and no 3D V-Cache. This extra cache is likely a key factor in the EPYC's superior performance on cache-sensitive workloads like data compression and the physics test.

Memory support is identical in type: both use DDR5 with a dual-channel memory bus and 83.2 GB/s of bandwidth. The EPYC 4584PX supports ECC memory, while the Ryzen 9 8945HX does not. PCIe capability is the same on paper: Gen 5 with 28 lanes from the CPU. Integrated graphics differ, with the EPYC featuring Radeon Graphics and the Ryzen 9 featuring Radeon 610M. The EPYC 4584PX has a locked multiplier, while the Ryzen 9 8945HX has an unlocked multiplier, which is unusual for a mobile part. The EPYC's release date is 2024-05-20, while the Ryzen 9 8945HX launched later on 2025-04-22.

Where Each One Wins

The EPYC 4584PX dominates nearly every workload category in the dataset. Its biggest wins are in physics simulation, where it more than doubles the Ryzen 9 8945HX score, and in prime number finding, where it leads by 68.3%. These results point to workloads that are heavily dependent on raw compute throughput and cache capacity. The EPYC also holds a consistent 20.6% advantage across all Cinebench tests, both single-core and multi-core, which indicates that its higher boost clock of 5.70 GHz and larger L3 cache provide a uniform uplift in rendering and 3D modeling tasks.

The data compression test, which is often sensitive to cache size, shows the EPYC ahead by 9.4%. The encryption test shows a 12.4% lead, and random string sorting shows 11.3%. These are all memory and cache intensive operations, and the EPYC's 128 MB L3 cache with the additional 64 MB 3D V-Cache slice appears to be the deciding factor. The multi-threaded PassMark score also favors the EPYC by 13.1%, reinforcing its suitability for parallel workloads.

The Ryzen 9 8945HX wins only the PassMark single-thread test, and by a narrow 2.9% margin. This is a genuine but limited advantage. In single-threaded applications that are not cache sensitive, the Ryzen 9 8945HX can edge ahead, likely due to its lower TDP and different power management characteristics. However, this single win does not offset the EPYC's broad superiority across the rest of the benchmark suite.

For server and workstation use cases, the EPYC 4584PX is clearly the stronger choice. Its wins in physics, prime finding, compression, encryption, and all Cinebench tests make it suitable for rendering, scientific computing, data processing, and virtualization workloads. The Ryzen 9 8945HX, with its single-thread win and much lower TDP of 55 watts, is more appropriate for mobile environments where power efficiency is critical and where single-threaded performance is a priority.

The Verdict

The benchmark data is unambiguous. The AMD EPYC 4584PX wins 15 of 17 head-to-head comparisons and leads by double-digit percentages in most of them. Its average benchmark score of 83,090 places it in the 96th percentile of all CPUs, while the Ryzen 9 8945HX has an average score of 76,212 and sits in the 95th percentile. The EPYC is 9% ahead on average benchmark score, a meaningful gap for identical core and thread counts.

The EPYC 4584PX's nearest rivals in the database are the AMD EPYC 9135 with an average score of 82,980, a 0.1% difference, and the Intel Core Ultra 9 285K at 83,807, which is 0.9% ahead. The Ryzen 9 8945HX, by contrast, sits close to the Intel Core Ultra 9 285HX at 76,155, a 0.1% difference, and the AMD Ryzen Threadripper PRO 9945WX at 76,513, which is 0.4% ahead. This context shows that the EPYC is competing in a higher performance tier entirely.

For users building a server or workstation, the EPYC 4584PX is the clear pick from this data. It offers ECC memory support, a larger L3 cache, a higher boost clock, and a dominant benchmark record. The Ryzen 9 8945HX is the choice only for mobile platforms where its 55 watt TDP and small single-thread advantage matter. Its unlocked multiplier also offers overclocking potential that the EPYC lacks, though the data does not include overclocked results. The verdict from the recorded measurements is straightforward: the EPYC 4584PX is the superior processor in almost every measurable way.

FAQ

Q: Which processor has the higher multi-core Cinebench R23 score?

A: The AMD EPYC 4584PX scores 51,524 in Cinebench R23 multi-core, while the AMD Ryzen 9 8945HX scores 42,713. The EPYC leads by 20.6%.

Q: Does the Ryzen 9 8945HX win any benchmarks?

A: Yes, it wins the PassMark single-thread test with a score of 3,907 versus 3,795 for the EPYC 4584PX, a 2.9% advantage. This is the only unique test category it wins.

Q: What is the difference in L3 cache size?

A: The EPYC 4584PX has 128 MB of shared L3 cache plus a 1x 64 MB 3D V-Cache slice. The Ryzen 9 8945HX has 64 MB of L3 cache and no 3D V-Cache.

Q: Which processor supports ECC memory?

A: The AMD EPYC 4584PX supports ECC memory. The AMD Ryzen 9 8945HX does not.

Q: How do their clock speeds compare?

A: The EPYC 4584PX has a base clock of 4.20 GHz and a boost clock of 5.70 GHz. The Ryzen 9 8945HX has a base clock of 2.50 GHz and a boost clock of 5.40 GHz.

Q: What is the TDP difference between the two?

A: The EPYC 4584PX has a TDP of 120 watts, while the Ryzen 9 8945HX has a TDP of 55 watts.

Specification Differences

| Specification | AMD EPYC 4584PX | AMD Ryzen 9 8945HX |

| --- | --- | --- |

| Series | EPYC 4004 series | 8000 series |

| Base Clock | 4.20 GHz | 2.50 GHz |

| Boost Clock | 5.70 GHz | 5.40 GHz |

| TDP | 120 W | 55 W |

| Socket | AMD Socket AM5 | AMD Socket FL1 |

| Codename | Raphael | Dragon Range |

| Transistors | 17,840 million | 13,140 million |

| L3 Cache | 128 MB (shared) | 64 MB |

| 3D V-Cache | 1x 64 MB Slice | None |

| ECC Memory | Yes | No |

| Integrated Graphics | Radeon Graphics | Radeon 610M |

| Market Segment | Server/Workstation | Mobile |

| Release Date | 2024-05-20 | 2025-04-22 |

| Launch MSRP | $699 | Not available |

| Multiplier Unlocked | No | Yes |

| Part Number | 100-000001481 | 100-000001848 |