AMD EPYC 4584PX vs Intel Core Ultra 9 285HX Comparison

The AMD EPYC 4584PX and Intel Core Ultra 9 285HX are both 97th-percentile performers, but they achieve that status through radically different designs. The EPYC is a 16-core, 32-thread server/workstation part on AMD Socket AM5 with a massive 128 MB of L3 cache, while the Core Ultra 9 is a 24-core, 24-thread mobile processor on Intel BGA 2114 with a much smaller 36 MB L3 cache. Benchmark results show the Intel part wins 12 of 17 head-to-head tests, yet the AMD part takes decisive victories in specific workloads like integer math and physics. The average benchmark scores are close — 86,371 for the EPYC versus 85,124 for the Core Ultra 9 — but the distribution of wins tells a more interesting story about workload fit.

The Verdict

The data points to a clear split: pick the Intel Core Ultra 9 285HX for general-purpose computing, single-threaded responsiveness, and floating-point-heavy tasks. It leads in every Cinebench test — R15, R20, and R23 — by a consistent 2.8% margin in both single-core and multi-core runs. Its single-thread Passmark score of 4,784 is 16.9% higher than the EPYC's 3,977, making it the better choice for lightly-threaded applications where per-core speed dominates.

Pick the AMD EPYC 4584PX for specific server-style workloads that reward large caches and integer throughput. It wins Passmark integer math by 29.5% (211,410 vs 163,213), data compression by 9% (772,693 vs 709,118), and physics by 17.4% (4,659 vs 3,970). The EPYC's 128 MB L3 cache versus Intel's 36 MB is the likely driver behind these wins, particularly for compression and integer workloads that benefit from keeping more working data on-die.

For mixed or unknown workloads, the Intel part is the safer default. Its multi-thread Passmark score of 62,297 edges out the EPYC's 60,617 by 2.7%, and its floating-point math score of 210,220 crushes the EPYC's 126,934 by 39.6%. The Core Ultra 9 also has 24 cores versus 16, though it lacks hyperthreading (24 threads vs 32), which explains why the core-count advantage doesn't translate into a larger multi-thread lead.

FAQ

Q: Which processor has better single-thread performance?

A: The Intel Core Ultra 9 285HX. Its Passmark single-thread score is 4,784 versus 3,977 for the EPYC 4584PX, a 16.9% advantage. It also wins every Cinebench single-core test by 2.8%.

Q: Is the EPYC 4584PX better at multi-threaded workloads?

A: Not consistently. The Intel part wins Cinebench R15, R20, and R23 multi-core by 2.8% each, and Passmark multithread by 2.7%. The EPYC wins Passmark physics by 17.4% and integer math by 29.5%, so it depends on the specific multi-threaded task.

Q: Why does the EPYC win integer math so decisively?

A: The EPYC scores 211,410 in Passmark integer math versus 163,213 for the Intel part, a 29.5% lead. This likely stems from its 128 MB shared L3 cache (with a 1x 64MB 3D V-Cache slice) compared to Intel's 36 MB, which reduces memory latency for integer-heavy loops.

Q: Which processor has a higher boost clock?

A: The AMD EPYC 4584PX boosts to 5.70 GHz, while the Intel Core Ultra 9 285HX boosts to 5.50 GHz. Despite the higher boost clock, the EPYC still loses all Cinebench single-core tests by 2.8%, indicating Intel's architecture is more efficient per clock.

Q: Do both support ECC memory?

A: Yes, both the EPYC 4584PX and the Core Ultra 9 285HX support ECC memory, and both use dual-channel DDR5. The Intel part has higher memory bandwidth at 102.4 GB/s versus 83.2 GB/s for the EPYC.

Q: Which has more PCIe lanes?

A: The AMD EPYC 4584PX provides 28 Gen 5 lanes (CPU only), while the Intel Core Ultra 9 285HX provides 20 Gen 5 lanes. For expansion-heavy server builds, the EPYC offers more headroom.

Architecture Differences

The two processors come from fundamentally different design philosophies. The EPYC 4584PX is built on Zen 4 architecture with the Raphael codename, produced on TSMC's 5 nm process. It uses 17,840 million transistors across a 2x 71 mm² die configuration. The Intel Core Ultra 9 285HX uses Arrow Lake architecture with the Arrow Lake-HX codename, produced on a smaller 3 nm TSMC node. It packs 17,800 million transistors into a single 243 mm² die.

Cache design separates them sharply. The EPYC features 64 KB L1 and 1 MB L2 per core, plus a 128 MB shared L3 cache that includes a 1x 64MB 3D V-Cache slice. The Intel part has larger per-core caches — 192 KB L1 and 3 MB L2 — but a much smaller 36 MB shared L3. The EPYC's total cache hierarchy is dominated by that massive L3, which is clearly aimed at server workloads with large working sets.

Memory and I/O also differ. Both support dual-channel DDR5 with ECC, but the Intel part achieves 102.4 GB/s memory bandwidth versus 83.2 GB/s for the EPYC. On PCIe, the EPYC offers 28 Gen 5 lanes versus 20 for Intel. The EPYC integrates Radeon Graphics, while Intel includes Arc Xe-LPG Graphics 64EU. The EPYC is unlocked for no multiplier adjustment, while the Intel part is multiplier unlocked.

Specification Differences

| Specification | AMD EPYC 4584PX | Intel Core Ultra 9 285HX |

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

| Cores / Threads | 16 / 32 | 24 / 24 |

| Base Clock | 4.20 GHz | 2.80 GHz |

| Boost Clock | 5.70 GHz | 5.50 GHz |

| TDP | 120 W | 55 W |

| Socket | AMD Socket AM5 | Intel BGA 2114 |

| Process Node | 5 nm | 3 nm |

| L1 Cache | 64 KB per core | 192 KB per core |

| L2 Cache | 1 MB per core | 3 MB per core |

| L3 Cache | 128 MB shared | 36 MB shared |

| Memory Bandwidth | 83.2 GB/s | 102.4 GB/s |

| PCIe | Gen 5, 28 Lanes | Gen 5, 20 Lanes |

| Integrated Graphics | Radeon Graphics | Arc Xe-LPG Graphics 64EU |

| Market Segment | Server/Workstation | Mobile |

| Release Date | 2024-05-20 | 2025-01-12 |

| Launch MSRP | $699 | N/A |

| Production Status | Active | Active |

The Intel part draws far less power — 55 W TDP versus 120 W — while delivering 24 cores. The EPYC's higher base clock of 4.20 GHz versus 2.80 GHz reflects its server orientation, prioritizing consistent throughput over efficiency. The Intel part's higher memory bandwidth (102.4 vs 83.2 GB/s) and larger per-core L1/L2 caches suggest a design tuned for single-thread latency, while the EPYC's 128 MB L3 targets capacity-hungry workloads.

Head-to-Head Benchmarks

The Intel Core Ultra 9 285HX sweeps every Cinebench test. In R15 multi-core, it scores 5,342 versus 5,193 for the EPYC, a 2.8% win. Single-core R15 goes 754 to 733, also 2.8%. The pattern repeats exactly in R20 (22,260 vs 21,640 multi-core; 3,142 vs 3,055 single-core) and R23 (53,000 vs 51,524 multi-core; 7,482 vs 7,274 single-core). The consistency of the 2.8% margin across all Cinebench variants suggests a fundamental per-clock advantage for Intel's Arrow Lake design.

Passmark results split more dramatically. The EPYC's biggest win comes in integer math: 211,410 versus 163,213, a 29.5% margin. It also wins data compression by 9% (772,693 vs 709,118), physics by 17.4% (4,659 vs 3,970), extended instructions by 2% (55,888 vs 54,810), and random string sorting by 3.2% (90,378 vs 87,568).

The Intel part's largest victory is in floating-point math: 210,220 versus 126,934, a massive 39.6% lead. It also wins data encryption by 11.1% (53,869 vs 47,904), find prime numbers by 9.1% (503 vs 457), single-thread by 16.9% (4,784 vs 3,977), and multithread by 2.7% (62,297 vs 60,617). In total, the Intel part wins 12 of 17 tests, but the EPYC's wins are often by larger margins.

Where Each One Wins

The Intel Core Ultra 9 285HX is the pick for floating-point heavy work. Its 39.6% lead in Passmark floating-point math is the single largest margin in the entire comparison, making it the obvious choice for scientific computing, simulation, and any workload dominated by FPU operations. It also wins all rendering benchmarks (Cinebench) by 2.8%, so content creation that relies on CPU rendering leans Intel. Single-thread performance is decisively better — 16.9% ahead in Passmark single-thread — which benefits everyday responsiveness, legacy software, and lightly-threaded games. Its encryption advantage of 11.1% also makes it preferable for security-related tasks like VPNs or encrypted storage.

The AMD EPYC 4584PX wins where cache capacity and integer throughput matter. The 29.5% lead in integer math suggests strong performance in database operations, financial modeling, and general server logic. Its 9% data compression win (772,693 vs 709,118) points to file archiving, backup systems, and in-memory compression workloads. The 17.4% physics win indicates better performance in physics simulation engines, which often rely on large working sets. Random string sorting at 3.2% ahead adds to the picture of a processor that excels at data manipulation tasks. With 28 PCIe Gen 5 lanes versus 20, the EPYC also offers more expansion headroom for server storage or networking cards, though that's an I/O advantage rather than a benchmark one.

For a mobile workstation or a general-purpose desktop replacement, the Intel part's combination of lower TDP (55 W vs 120 W), higher single-thread scores, and floating-point dominance makes it the more versatile choice. For a dedicated server or workstation running cache-sensitive integer workloads, the EPYC's 128 MB L3 and 32 threads give it a clear edge in specific, high-value tasks. The average benchmark scores differ by only 1.5% in the EPYC's favor (86,371 vs 85,124), but the workload profile matters far more than that aggregate figure.