AMD EPYC 7443P vs Intel Core Ultra 9 285HX Comparison

The Verdict

The AMD EPYC 7443P and Intel Core Ultra 9 285HX serve entirely different market segments, and the benchmark data reflects that split clearly. The EPYC 7443P wins 11 of the 17 recorded head-to-head comparisons, while the Core Ultra 9 285HX takes 6. The EPYC 7443P is the choice for sustained multi-threaded throughput, server workloads, and memory-heavy tasks, with decisive wins in Cinebench R23 multi-core (32.9% ahead), PassMark integer math (50% ahead), and PassMark physics (36.6% ahead). The Core Ultra 9 285HX is the pick for single-thread responsiveness, floating-point math, and any workload that benefits from its much higher boost clock, as shown by its 37.1% lead in PassMark single-thread and 33.4% lead in floating-point math.

For a server or workstation chassis, the EPYC 7443P is the default recommendation. Its 48 threads versus 24, eight-channel memory bus versus dual-channel, and 128 MB of shared L3 cache versus 36 MB create a structural advantage in heavily parallel workloads. For a laptop or mobile workstation, the Core Ultra 9 285HX is the only realistic option, with a 55 W TDP against the EPYC's 200 W, integrated Arc Xe-LPG graphics, and a 5.50 GHz boost clock. The data does not suggest either chip is "better" in absolute terms; it suggests they are optimized for different physical and thermal envelopes.

Architecture Differences

The EPYC 7443P is built on AMD's Zen 3 architecture, codenamed Milan, using a 7 nm process from TSMC. It packs 24 cores and 48 threads with a base clock of 2.85 GHz and a boost clock of 4.00 GHz. The Core Ultra 9 285HX uses Intel's Arrow Lake architecture (Arrow Lake-HX), fabricated on a 3 nm process, also from TSMC. It matches the EPYC's 24 cores but halves the thread count to 24, with a base clock of 2.80 GHz and a significantly higher boost clock of 5.50 GHz.

Transistor counts are close: the EPYC has 16,600 million transistors across a 4x 81 mm² die setup, while the Core Ultra has 17,800 million on a single 243 mm² die. Cache hierarchies differ substantially. The EPYC provides 64 KB of L1 per core, 512 KB of L2 per core, and 128 MB of shared L3. The Core Ultra has 192 KB of L1 per core, 3 MB of L2 per core, and only 36 MB of shared L3. That L3 gap, 128 MB versus 36 MB, is a major differentiator for the EPYC in data-intensive workloads.

Memory support also diverges: the EPYC uses DDR4 with an eight-channel bus and 204.8 GB/s of bandwidth, while the Core Ultra uses DDR5 with a dual-channel bus and 102.4 GB/s. Both support ECC memory. PCIe connectivity favors the EPYC massively: 128 Gen 4 lanes versus 20 Gen 5 lanes for the Core Ultra. The Core Ultra has integrated Arc Xe-LPG Graphics with 64 execution units; the EPYC has no integrated graphics. The Core Ultra has an unlocked multiplier; the EPYC does not.

Head-to-Head Benchmarks

The largest single benchmark gap belongs to the EPYC in Cinebench R23 single-core, where it scores 6837 against the Core Ultra's 2187.5, a 212.5% advantage. That is an extreme outlier, likely reflecting the Core Ultra's mobile power constraints in that specific test. Similarly, in Cinebench R15 single-core, the EPYC leads 689 to 323.5, a 113% margin. However, in PassMark single-thread, the Core Ultra reverses the trend, scoring 4618 against 2907, a 37.1% lead. The two single-core measurements are inconsistent across test suites, which suggests the EPYC's advantage in Cinebench single-core is not universal.

In multi-core Cinebench, the results are mixed. The Core Ultra wins Cinebench R15 multi-core with 5656.5 against 4881, a 13.7% lead. But the EPYC wins Cinebench R20 multi-core by a razor-thin 0.5% margin (20341 versus 20236), and then dominates Cinebench R23 multi-core with 48433 versus 36429.5, a 32.9% advantage. This pattern indicates that as the workload becomes heavier and longer, the EPYC's extra threads and larger cache pull ahead.

PassMark results show a similar split. The EPYC wins data compression by 29.9% (820859 versus 631885), data encryption by 17.9% (57263 versus 48567), integer math by 50% (232632 versus 155076), physics by 36.6% (4748 versus 3476), and random string sorting by 23.8% (95581 versus 77196). The Core Ultra wins extended instructions by 1.9% (49148 versus 48213), find prime numbers by 10.9% (460 versus 410), and floating-point math by a commanding 33.4% (194998 versus 129932). The multithread score is nearly identical, 56981 for the EPYC and 56902 for the Core Ultra, a 0.1% difference.

Specification Differences

| Specification | AMD EPYC 7443P | Intel Core Ultra 9 285HX |

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

| Series | EPYC 7003 series | Core Ultra Series 2 |

| Cores | 24 | 24 |

| Threads | 48 | 24 |

| Base clock | 2.85 GHz | 2.80 GHz |

| Boost clock | 4.00 GHz | 5.50 GHz |

| TDP | 200 W | 55 W |

| Socket | AMD Socket SP3 | Intel BGA 2114 |

| Architecture | Zen 3 | Arrow Lake |

| Process node | 7 nm | 3 nm |

| L1 cache | 64 KB (per core) | 192 KB (per core) |

| L2 cache | 512 KB (per core) | 3 MB (per core) |

| L3 cache | 128 MB (shared) | 36 MB (shared) |

| Memory support | DDR4 | DDR5 |

| Memory bus | Eight-channel | Dual-channel |

| Memory bandwidth | 204.8 GB/s | 102.4 GB/s |

| PCIe | Gen 4, 128 lanes | Gen 5, 20 lanes |

| Integrated graphics | None | Arc Xe-LPG 64EU |

| Market segment | Server/Workstation | Mobile |

| Release date | 2021-03-14 | 2025-01-12 |

| Launch MSRP | $1337 | None recorded |

| Multiplier unlocked | No | Yes |

FAQ

Q: Which processor has more threads?

A: The AMD EPYC 7443P has 48 threads, double the 24 threads of the Intel Core Ultra 9 285HX, despite both having 24 cores.

Q: Which chip has the higher boost clock?

A: The Intel Core Ultra 9 285HX boosts to 5.50 GHz, while the AMD EPYC 7443P tops out at 4.00 GHz.

Q: Which processor shows a bigger single-core Cinebench lead?

A: The AMD EPYC 7443P leads by 212.5% in Cinebench R23 single-core and by 113% in Cinebench R15 single-core, though the Intel chip leads by 37.1% in PassMark single-thread.

Q: How much L3 cache does each processor have?

A: The AMD EPYC 7443P has 128 MB of shared L3 cache, while the Intel Core Ultra 9 285HX has 36 MB of shared L3 cache.

Q: Which processor has the higher TDP?

A: The AMD EPYC 7443P has a 200 W TDP, compared to the Intel Core Ultra 9 285HX's 55 W TDP.

Q: Which chip supports more PCIe lanes?

A: The AMD EPYC 7443P supports 128 Gen 4 lanes, while the Intel Core Ultra 9 285HX supports 20 Gen 5 lanes.

Where Each One Wins

The AMD EPYC 7443P is the clear winner in workloads that scale with thread count, memory bandwidth, and cache capacity. Its 48 threads, 128 MB of L3, and 204.8 GB/s of eight-channel DDR4 bandwidth drive 11 benchmark wins. Data compression shows a 29.9% advantage, integer math a 50% advantage, and physics a 36.6% advantage. For Cinebench R23 multi-core, the EPYC is 32.9% ahead. Any server-side task, database workload, virtualization host, or batch rendering job will favor the EPYC. Its 128 PCIe Gen 4 lanes also make it the obvious choice for systems with many NVMe drives or GPUs.

The Intel Core Ultra 9 285HX wins in single-thread throughput (PassMark single-thread, 37.1% ahead), floating-point math (33.4% ahead), and prime number finding (10.9% ahead). Its 5.50 GHz boost clock and 3 MB of L2 per core give it an edge in latency-sensitive, lightly threaded applications. It also wins Cinebench R15 multi-core by 13.7%, which suggests that shorter, bursty multi-core workloads can favor the Intel chip. The Core Ultra's integrated Arc Xe-LPG graphics mean a system can run without a discrete GPU, something the EPYC cannot offer. Its 55 W TDP makes it suitable for mobile workstations where power and cooling are constrained.

The two chips barely overlap in their intended use cases. The EPYC is a server processor with a 200 W TDP and SP3 socket, designed for a rack or tower chassis. The Core Ultra is a mobile processor with a BGA 2114 socket, designed to be soldered into a laptop. The data confirms that the EPYC is the throughput king, while the Core Ultra is the responsive, power-efficient option. Choose the EPYC for heavy parallel compute, and the Core Ultra for mobile work or tasks that rely on floating-point performance and single-core speed.