AMD EPYC 7313 vs AMD Ryzen 9 7945HX Comparison

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 9 7945HX boosts to 5.40 GHz, while the AMD EPYC 7313 tops out at 3.70 GHz. The Ryzen has a significant raw frequency advantage.

Q: How do they compare in multi-threaded performance?

A: The Ryzen 9 7945HX wins 11 of the 15 head-to-head benchmarks. In Cinebench R23 multi-core, it scores 33,459 versus 32,847 for the EPYC, a 1.9% lead. The Ryzen is much further ahead in PassMark multithread, scoring 54,548 against 38,644, a 41.2% advantage.

Q: Are there tests where the EPYC 7313 wins?

A: Yes, the EPYC wins 4 tests. It leads in Cinebench R23 single-core by 58.2% (4,637 vs 1,940) and in Cinebench R15 single-core by 34% (467 vs 308). It also wins PassMark physics by 35.9% and PassMark find prime numbers by 8.4%.

Q: What are the memory and PCIe differences?

A: The Ryzen 9 7945HX uses DDR5 memory on a dual-channel bus with 83.2 GB/s bandwidth and PCIe Gen 5 with 28 CPU lanes. The EPYC 7313 uses DDR4 on an eight-channel bus with 204.8 GB/s bandwidth, and PCIe Gen 4 with 128 CPU lanes.

Q: What is the difference in thermal design power?

A: The Ryzen 9 7945HX has a TDP of 55 watts, while the EPYC 7313 is rated at 155 watts. The EPYC draws considerably more power and is designed for server platforms.

Q: How do their single-thread scores compare in PassMark?

A: The Ryzen 9 7945HX scores 4,040 in PassMark single-thread, which is 68.2% higher than the EPYC's 2,402. This is a major win for the mobile chip.

The Verdict

The data paints a clear picture of two very different processors. The AMD Ryzen 9 7945HX is the better choice for anyone needing raw speed in shorter bursts, especially in single-threaded applications and in most multi-threaded tests. Its 68.2% lead in PassMark single-thread and 41.2% lead in PassMark multithread are decisive. For workloads like data compression, integer math, and floating-point math, the Ryzen is substantially faster.

The AMD EPYC 7313 is the better pick for server environments that prioritize sustained throughput, massive memory bandwidth, and platform scalability. Its eight-channel memory bus provides 204.8 GB/s of bandwidth, which is critical for memory-intensive server tasks. The EPYC also has a major advantage in single-core Cinebench scores, which is notable for a server part.

If you are building a high-end mobile workstation or a compact desktop, the Ryzen 9 7945HX is the winner. If you are populating a server rack and need the full ecosystem of ECC memory, PCIe lanes, and enterprise features, the EPYC 7313 is the correct choice. The data suggests the Ryzen is a better performer in the majority of benchmarks, but the EPYC's platform advantages are substantial.

Head-to-Head Benchmarks

The most lopsided wins belong to the Ryzen 9 7945HX. In PassMark single-thread, it scores 4,040 versus 2,402, a 68.2% difference. That is a massive gap in raw IPC and frequency. The Ryzen also dominates in Cinebench R15 multi-core, scoring 5,289 versus 3,310, a 59.8% lead. This shows the Ryzen can deliver exceptional performance in older multi-threaded tests.

The EPYC 7313 has its own notable victories. Its Cinebench R23 single-core score is 4,637, which is 58.2% higher than the Ryzen's 1,940. This is an unusual result for a server chip. The EPYC also wins in PassMark physics, scoring 3,899 versus 2,500, a 35.9% lead. These wins suggest the EPYC has a strength in specific single-threaded and physics-based workloads.

In the newer multi-core test, Cinebench R23, the Ryzen wins but by a narrower margin, 33,459 versus 32,847, only 1.9% ahead. This shows the EPYC is very competitive in modern all-core rendering. The Ryzen wins PassMark data compression by 34.6% (707,249 versus 525,507) and integer math by 44.5% (207,524 versus 143,648). The Ryzen also has a 56.7% advantage in floating-point math (123,390 versus 78,748) and a 55.1% lead in extended instructions (51,834 versus 33,430).

The only other EPYC win is in PassMark find prime numbers, where it scores 310 against 284, an 8.4% lead. The overall pattern is that the Ryzen is faster in the majority of general-purpose and math-heavy tasks, while the EPYC holds its own in single-threaded Cinebench and physics simulations. The Ryzen wins 11 tests, the EPYC wins 4.

Specification Differences

| Specification | AMD Ryzen 9 7945HX | AMD EPYC 7313 |

| :--- | :--- | :--- |

| Base Clock | 2.50 GHz | 3.00 GHz |

| Boost Clock | 5.40 GHz | 3.70 GHz |

| TDP | 55 W | 155 W |

| Socket | AMD Socket FL1 | AMD Socket SP3 |

| Process Node | 5 nm | 7 nm |

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

| Die Size | 2x 71 mm² | 4x 81 mm² |

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

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

| Memory Support | DDR5 | DDR4 |

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

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

| PCIe | Gen 5, 28 Lanes (CPU only) | Gen 4, 128 Lanes (CPU only) |

| Integrated Graphics | Radeon 610M | None |

| Multiplier Unlocked | Yes | No |

| Release Date | 2023-01-03 | 2021-03-14 |

| Launch MSRP | Not available | $1083 |

Both processors have 16 cores and 32 threads, and both support ECC memory. The EPYC has a much higher base clock (3.00 GHz vs 2.50 GHz), but a significantly lower boost clock. The Ryzen is built on a newer 5nm process, while the EPYC uses 7nm. The EPYC has twice the L3 cache (128 MB vs 64 MB) and a much wider memory bus. The Ryzen has a smaller memory bandwidth but supports faster DDR5 memory. The EPYC provides far more PCIe lanes for expansion in server environments.

Architecture Differences

The AMD Ryzen 9 7945HX is built on the Zen 4 architecture, codenamed Dragon Range. It is a mobile processor designed for high-performance laptops. It uses a 5 nm process node from TSMC, with 13,140 million transistors on two 71 mm² dies. It has 64 KB of L1 cache per core and 1 MB of L2 per core. Its 64 MB of shared L3 cache is a single pool for all cores. It also includes a Radeon 610M integrated GPU, which is useful for systems without a discrete graphics card.

The AMD EPYC 7313 is based on the Zen 3 architecture, codenamed Milan. It is a server processor for the SP3 platform. It uses an older 7 nm node and has 16,600 million transistors spread across four 81 mm² dies. Its L2 cache is smaller, at 512 KB per core, but its L3 cache is a larger 128 MB shared. It has no integrated graphics. The EPYC is designed for multi-socket server boards, and its architecture is tailored for high throughput and memory density.

The core count and thread count are identical (16 cores, 32 threads), but the cache structure is different. The EPYC has more total L3 cache, while the Ryzen has more L2 cache per core. The Ryzen also has an integrated GPU and a newer architecture, which likely contributes to its higher single-threaded PassMark score. The EPYC's architecture is optimized for server workloads, which is evident in its memory capabilities and PCIe lane count.

Where Each One Wins

AMD Ryzen 9 7945HX Wins:

• General multi-threaded performance: Wins in PassMark multithread by 41.2%, Cinebench R15 multi-core by 59.8%, and Cinebench R23 multi-core by 1.9%.
• Math-intensive workloads: Wins PassMark integer math by 44.5%, floating point math by 56.7%, and extended instruction set tests by 55.1%.
• Data processing: Wins PassMark data compression by 34.6%, data encryption by 33.9%, and random string sorting by 41.1%.
• Single-threaded PassMark: Wins PassMark single-thread by a huge 68.2% margin.
• User for: High-performance mobile workstations, gaming laptops, and compact desktops that need maximum per-core speed and strong all-core throughput.

AMD EPYC 7313 Wins:

• Single-threaded Cinebench: Wins Cinebench R23 single-core by 58.2% and Cinebench R15 single-core by 34%.
• Physics simulations: Wins PassMark physics by 35.9%.
• Prime number calculations: Wins PassMark find prime numbers by 8.4%.
• Memory and expansion: Provides 204.8 GB/s memory bandwidth (vs 83.2 GB/s) and 128 PCIe Gen 4 lanes (vs 28 Gen 5 lanes).
• Use case: Server and workstation environments that need massive memory scalability, high ECC memory capacity, and enterprise-grade reliability. Its higher TDP and server architecture make it better for sustained, heavy-duty workloads in a rack.

The data shows the Ryzen is the better processor for most software, while the EPYC wins in specific server-centric tasks and offers superior platform capabilities.