AMD EPYC 7413 vs AMD Ryzen 9 8945HX Comparison

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7413 has 24 cores and 48 threads, while the AMD Ryzen 9 8945HX has 16 cores and 32 threads. The EPYC leads by 8 cores and 16 threads.

Q: How does the boost clock compare between the two?

A: The Ryzen 9 8945HX boosts to 5.40 GHz, which is significantly higher than the EPYC 7413's 3.60 GHz boost. The base clocks are closer: 2.50 GHz for the Ryzen versus 2.65 GHz for the EPYC.

Q: What is the thermal design power (TDP) difference?

A: The EPYC 7413 has a TDP of 180 W, while the Ryzen 9 8945HX has a TDP of 55 W. The EPYC draws over three times the power budget.

Q: Which CPU supports DDR5 memory?

A: Only the Ryzen 9 8945HX supports DDR5. The EPYC 7413 uses DDR4. The EPYC compensates with an eight-channel memory bus providing 204.8 GB/s bandwidth, versus the Ryzen's dual-channel 83.2 GB/s.

Q: Does the Ryzen 9 8945HX have integrated graphics?

A: Yes, it includes Radeon 610M graphics. The EPYC 7413 has no integrated graphics, typical for a server processor.

Q: Which chip has a higher single-thread benchmark score?

A: The Ryzen 9 8945HX scores 3907 in PassMark single-thread, versus 2400 for the EPYC 7413. That is a 38.6% advantage for the Ryzen.

Architecture Differences

The two processors represent different architectural generations and design philosophies. The EPYC 7413 is built on Zen 3 architecture (codenamed Milan) using a 7 nm process from TSMC, with a transistor count of 16,600 million spread across 4 dies of 81 mm² each. The Ryzen 9 8945HX uses the newer Zen 4 architecture (codenamed Dragon Range) on a 5 nm process, also from TSMC, with 13,140 million transistors across 2 dies of 71 mm² each.

Cache organization differs substantially. Both share 64 KB of L1 per core, but the L2 cache per core doubles on the Ryzen: 1 MB versus 512 KB on the EPYC. The L3 cache favors the EPYC heavily, with 128 MB shared versus 64 MB on the Ryzen. This larger L3 pool likely contributes to the EPYC's superior data compression and encryption results.

PCIe capabilities contrast sharply. The EPYC 7413 offers Gen 4 with 128 lanes (CPU only), while the Ryzen 9 8945HX provides Gen 5 with 28 lanes (CPU only). The EPYC's lane count suits multi-GPU and high-density storage servers, whereas the Ryzen's fewer but faster lanes target mobile platforms.

Memory architecture also diverges. The EPYC uses DDR4 with an eight-channel bus and 204.8 GB/s bandwidth. The Ryzen 9 8945HX uses DDR5 with a dual-channel bus and 83.2 GB/s bandwidth. The server chip trades newer memory technology for far greater aggregate bandwidth, which matters for workloads that stream large datasets.

ECC memory support is exclusive to the EPYC 7413. The Ryzen 9 8945HX lacks ECC, consistent with its mobile market segment. The EPYC also features a locked multiplier, while the Ryzen's multiplier is unlocked, enabling overclocking on compatible platforms.

The Ryzen 9 8945HX integrates Radeon 610M graphics, something the EPYC does not offer. The EPYC is designed for server sockets (AMD Socket SP3), while the Ryzen uses AMD Socket FL1 for mobile. The Ryzen is newer, with a release date of 2025-04-22, compared to the EPYC's 2021-03-14.

The Verdict

The data indicates a clear split by workload type. The EPYC 7413 wins 13 of 17 head-to-head benchmarks, but the Ryzen 9 8945HX wins the four most telling single-threaded or mobile-oriented tests. For server-side multithreaded tasks, the EPYC's 24 cores, 48 threads, and 128 MB L3 cache deliver decisive victories in prime number finding (51.5% ahead) and physics (117.2% ahead). The Ryzen's 5.40 GHz boost clock and newer Zen 4 architecture give it a 38.6% single-thread advantage, making it the choice for lightly threaded applications where per-core speed dominates.

The EPYC 7413's 0.8% lead across all Cinebench versions, from R15 to R23, shows consistent multicore strength. The Ryzen 9 8945HX's PassMark single-thread score of 3907 versus 2400 indicates a fundamentally different performance profile. The EPYC's 95th percentile ranking among all CPUs matches the Ryzen's 95th percentile, but the average benchmark scores tell a story: the EPYC averages 80041, while the Ryzen averages 76212, a 5% gap.

For server deployments, the EPYC 7413's ECC support, eight-channel memory, and 128 PCIe Gen 4 lanes align with enterprise requirements. For mobile workstations, the Ryzen 9 8945HX's integrated graphics, 55 W TDP, and DDR5 support fit portable use cases. The launch MSRP of the EPYC 7413 is $1825, reflecting its server positioning.

Specification Differences

| Specification | AMD EPYC 7413 | AMD Ryzen 9 8945HX |

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

| Cores | 24 | 16 |

| Threads | 48 | 32 |

| Base Clock | 2.65 GHz | 2.50 GHz |

| Boost Clock | 3.60 GHz | 5.40 GHz |

| TDP | 180 W | 55 W |

| Socket | AMD Socket SP3 | AMD Socket FL1 |

| Architecture | Zen 3 | Zen 4 |

| Codename | Milan | Dragon Range |

| Process Node | 7 nm | 5 nm |

| Transistors | 16,600 million | 13,140 million |

| Die Size | 4x 81 mm² | 2x 71 mm² |

| L2 Cache (per core) | 512 KB | 1 MB |

| L3 Cache | 128 MB shared | 64 MB |

| Memory Support | DDR4 | DDR5 |

| Memory Bus | Eight-channel | Dual-channel |

| Memory Bandwidth | 204.8 GB/s | 83.2 GB/s |

| ECC Memory | Yes | No |

| PCIe | Gen 4, 128 Lanes | Gen 5, 28 Lanes |

| Integrated Graphics | None | Radeon 610M |

| Market Segment | Server/Workstation | Mobile |

| Release Date | 2021-03-14 | 2025-04-22 |

| Multiplier Unlocked | No | Yes |

Head-to-Head Benchmarks

The EPYC 7413 dominates the Cinebench suite with narrow but consistent wins. In Cinebench R15 multicore, the EPYC scores 4338 against 4305, a 0.8% margin. R15 single-core shows 612 versus 607, again 0.8%. R20 multicore: 18078 versus 17939 (0.8%). R20 single-core: 2551 versus 2532 (0.8%). R23 multicore: 43044 versus 42713 (0.8%). R23 single-core: 6076 versus 6030 (0.8%). These results suggest the EPYC's extra cores and threads barely outweigh the Ryzen's higher boost clock in synthetic rendering workloads.

PassMark data compression heavily favors the EPYC: 715616 versus 677755, a 5.6% lead. Data encryption shows an even larger gap: 48492 versus 40836, an 18.7% advantage. Prime number finding is the EPYC's largest win at 51.5% (397 versus 262). Floating-point math is close: 118881 versus 117453, a 1.2% EPYC edge. Integer math goes to the EPYC by 10.5% (215629 versus 195180). Physics is the most lopsided result: 4708 versus 2168, a 117.2% EPYC advantage. Random string sorting favors the EPYC by 3% (81134 versus 78781).

The Ryzen 9 8945HX takes four wins. Extended instructions favor the Ryzen: 49823 versus 45696, an 8.3% margin. PassMark multithread goes to the Ryzen by 1.5% (51405 versus 50641). The two single-thread entries, PassMark single-thread and singlethread, both show identical scores of 3907 versus 2400, a 38.6% Ryzen advantage. These wins highlight the Zen 4 architecture's improved instruction handling and per-core efficiency.

Where Each One Wins

The EPYC 7413 excels in server-class compute tasks. Its 117.2% physics advantage and 51.5% prime number lead indicate strong raw computational throughput for scientific and engineering simulations. The 18.7% encryption edge makes it suitable for security-focused workloads, while the 10.5% integer math win benefits database and transaction processing. Data compression at 5.6% ahead supports file server and backup applications. The 128 MB L3 cache and eight-channel memory bandwidth back these results.

The Ryzen 9 8945HX wins where single-thread speed and modern instruction sets matter. Its 38.6% single-thread lead makes it ideal for legacy applications, scripting, and interactive workloads that rely on one or two cores. The 8.3% extended instructions win suggests better handling of newer SIMD workloads. The 1.5% multithread PassMark win, despite fewer cores, points to superior per-core efficiency from the 5 nm process and Zen 4 design. The integrated Radeon 610M graphics and 55 W TDP make it practical for mobile systems without discrete GPUs.

The EPYC's 95th percentile ranking and average score of 80041 versus the Ryzen's 76212 confirm the server chip as the stronger overall performer. However, the Ryzen's nearest rival, the Intel Core Ultra 9 285HX, sits at 76155, a 0.1% delta, indicating a tight competitive cluster. The EPYC's nearest rival, the Intel Xeon w5-2565X, scores 80671, a 0.8% delta, placing the EPYC nearly at parity with that workstation processor. For buyers, the choice depends on whether the workload scales across 24 cores or prefers the speed of one.