AMD EPYC 7473X vs AMD Ryzen 3 7320C Comparison

The AMD EPYC 7473X and AMD Ryzen 3 7320C occupy opposite ends of the computing spectrum, yet both are active products from the same manufacturer. The EPYC 7473X is a 24-core server processor built for massive throughput, while the Ryzen 3 7320C is a 4-core mobile chip designed for efficiency. The benchmark data shows a complete sweep for the EPYC part across all Cinebench tests, but the two chips are not competing for the same buyer. This analysis breaks down the architectural chasm, the specific benchmark deltas, and which processor is the logical choice for which workload.

FAQ

Q: How much faster is the EPYC 7473X in multi-core rendering?

A: The EPYC 7473X leads by enormous margins in multi-core tests. In Cinebench R23 multi-core, it scores 50388 versus the Ryzen 3 7320C's 7025, a delta of 617.3%. The R20 multi-core test shows a similar gap, with the EPYC at 21162 and the Ryzen at 2950, a 617.4% difference.

Q: Does the Ryzen 3 7320C win any benchmark comparisons?

A: No. In the head-to-head benchmark data, the EPYC 7473X wins all 6 recorded tests. The Ryzen 3 7320C has 0 wins. The single-core deltas are just as lopsided, ranging from 623.2% in Cinebench R15 to 617.8% in Cinebench R23.

Q: What is the difference in memory bandwidth between the two?

A: The EPYC 7473X supports DDR4 memory with an eight-channel bus, providing 204.8 GB/s of bandwidth. The Ryzen 3 7320C uses LPDDR5 with a dual-channel bus, offering 88.0 GB/s. This is a significant factor in server workloads that are memory-bandwidth sensitive.

Q: Which processor has more PCIe lanes for expansion?

A: The EPYC 7473X provides Gen 4 with 128 lanes (CPU only), making it suitable for many GPUs and NVMe drives. The Ryzen 3 7320C offers only Gen 3 with 4 lanes (CPU only), which is typical for a low-power mobile part.

Q: What are the TDP and process node differences?

A: The EPYC 7473X has a TDP of 240 W and is built on a 7 nm process. The Ryzen 3 7320C has a TDP of just 15 W and uses a smaller 6 nm process node. This explains the massive efficiency difference between the two.

Q: Do both processors support ECC memory?

A: No. The EPYC 7473X has ECC memory support, which is critical for data integrity in servers. The Ryzen 3 7320C does not support ECC memory, aligning with its mobile consumer positioning.

Architecture Differences

The architectural divide is stark, starting with the fundamental design goals. The EPYC 7473X is a Zen 3 part from the Milan-X family, built on a 7 nm process at TSMC. It packs 24 cores and 48 threads, with a base clock of 2.80 GHz and a boost clock of 3.70 GHz. Its cache configuration is the headline feature: a massive 768 MB of shared L3 cache, alongside the standard 64 KB L1 and 512 KB L2 per core. This is a server/workstation chip designed to hold enormous datasets close to the cores.

The Ryzen 3 7320C is a completely different animal. It is a Zen 2 part from the Mendocino family, built on a more advanced 6 nm process. It has just 4 cores and 8 threads, with a base clock of 2.40 GHz and a higher boost clock of 4.10 GHz. Its L3 cache is a modest 4 MB shared, with the same 64 KB L1 and 512 KB L2 per core. The transistor count is not listed for the Ryzen, but the EPYC lists 33,200 million transistors spread across 8x 81 mm² dies, while the Ryzen is a single 100 mm² die.

Memory architecture reinforces the split. The EPYC 7473X uses DDR4 over an eight-channel bus, yielding 204.8 GB/s of bandwidth, and supports ECC. The Ryzen 3 7320C uses LPDDR5 over a dual-channel bus, yielding 88.0 GB/s, with no ECC support. PCIe capabilities also diverge: the EPYC offers Gen 4 with 128 lanes, while the Ryzen offers Gen 3 with only 4 lanes. The Ryzen includes integrated Radeon 610M graphics, while the EPYC has no integrated graphics listed. The sockets are incompatible: SP3 for the EPYC and FT6 for the Ryzen.

Where Each One Wins

The data suggests a clear-cut split: the EPYC 7473X wins every compute-heavy benchmark, while the Ryzen 3 7320C wins on efficiency and mobility. For server virtualization, database processing, and heavy multi-threaded rendering, the EPYC 7473X is the obvious choice. Its 24 cores, 48 threads, and massive 768 MB L3 cache are built for workloads where data fits in cache and core count reigns supreme. The 204.8 GB/s memory bandwidth and 128 PCIe Gen 4 lanes support dense compute and I/O configurations.

The Ryzen 3 7320C wins where power draw and physical footprint matter. With a 15 W TDP, it is suited for thin-and-light laptops or fanless embedded systems. Its 4 cores and 8 threads are enough for everyday productivity and light multitasking. The integrated Radeon 610M graphics eliminates the need for a discrete GPU in basic systems. While it loses every Cinebench test by a factor of roughly 7x, it does so while consuming 16x less power (15 W vs 240 W TDP), making it the only rational choice for battery-powered or passively cooled devices.

Specification Differences

| Specification | AMD EPYC 7473X | AMD Ryzen 3 7320C |

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

| Series | EPYC 7003 series | 7000 series |

| Cores | 24 | 4 |

| Threads | 48 | 8 |

| Base Clock | 2.80 GHz | 2.40 GHz |

| Boost Clock | 3.70 GHz | 4.10 GHz |

| TDP | 240 W | 15 W |

| Socket | AMD Socket SP3 | AMD Socket FT6 |

| Architecture | Zen 3 | Zen 2 |

| Codename | Milan-X | Mendocino |

| Process Node | 7 nm | 6 nm |

| Die Size | 8x 81 mm² | 100 mm² |

| L3 Cache | 768 MB (shared) | 4 MB (shared) |

| Memory Support | DDR4 | LPDDR5 |

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

| Memory Bandwidth | 204.8 GB/s | 88.0 GB/s |

| ECC Memory | Yes | No |

| PCIe | Gen 4, 128 Lanes | Gen 3, 4 Lanes |

| Integrated Graphics | None | Radeon 610M |

| Market Segment | Server/Workstation | Mobile |

| Launch MSRP | $3900 | N/A |

Head-to-Head Benchmarks

The Cinebench results are a one-sided affair, with the EPYC 7473X winning every test by a margin of over 600%. In Cinebench R15 multi-core, the EPYC scores 5078 versus the Ryzen's 708, a 617.2% delta. The single-core R15 test shows 716 versus 99, a 623.2% delta. This pattern holds across every iteration.

Cinebench R20 multi-core sees the EPYC at 21162 and the Ryzen at 2950, a 617.4% gap. Single-core R20 is 2987 versus 416, a 618% delta. The most recent Cinebench R23 test shows the EPYC at 50388 multi-core and 7113 single-core, against the Ryzen's 7025 and 991, respectively. The deltas are 617.3% and 617.8%.

The data reveals that the EPYC's advantage is consistent regardless of the workload type. It does not just scale with core count; the per-core performance is also vastly superior. The EPYC's single-core scores are roughly 6.2x higher than the Ryzen's, which highlights the architectural generational leap from Zen 2 to Zen 3, as well as the much larger cache. The Ryzen's higher boost clock of 4.10 GHz over the EPYC's 3.70 GHz does nothing to close the gap, as the older Zen 2 architecture and 4 MB L3 cache cannot compete.

The Verdict

The choice between these two processors is dictated entirely by the physical and thermal envelope of the target system. The data shows the EPYC 7473X is the undisputed performance king, winning 6 out of 6 head-to-head benchmarks with margins exceeding 617%. It is the only option for a server or workstation that needs 24 cores, 48 threads, 768 MB of L3 cache, and 204.8 GB/s of memory bandwidth. Its launch MSRP of $3900 reflects its enterprise positioning, and its 240 W TDP requires a serious cooling solution and power delivery system.

The Ryzen 3 7320C is the right choice for a mobile or low-power device. With a 15 W TDP, it is in a different class entirely. It will not win any performance awards against the EPYC, but it does not need to. Its 4 cores and 8 threads, combined with integrated Radeon 610M graphics and LPDDR5 memory support, make it a competent chip for a budget laptop. The passmark data for the Ryzen, which is not available for the EPYC, shows reasonable scores for integer math (32247) and floating-point math (14071) relative to its class.

If you are building a rack server, the EPYC 7473X is the only viable choice. If you are designing a thin client or Chromebook-class device, the Ryzen 3 7320C is the only viable choice. Neither processor is a substitute for the other. The benchmark data confirms the EPYC's dominance in absolute performance, but the Ryzen's 16x lower TDP is a specification that no benchmark score can overcome for mobile use. Pick the EPYC for compute density, pick the Ryzen for power efficiency.