AMD EPYC 7763 vs AMD EPYC 8434P Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive sweep: the AMD EPYC 7763 wins all 17 head-to-head comparisons, with the EPYC 8434P failing to take a single test. The margins, however, vary widely by workload, which reveals the character of each chip.

The largest gap appears in PassMark's find prime numbers test, where the 7763 scores 668 versus the 8434P's 298, a 124.2% advantage. This is the only test where the 7763 more than doubles the 8434P's output. The second-largest margin is in PassMark physics, with the 7763 at 7708 and the 8434P at 4036, a 91% lead. These two results suggest that integer-heavy, branch-predictor-sensitive workloads strongly favor the older, larger chip.

Memory and cache-latency-sensitive tasks also show substantial gaps. The 7763 leads in random string sorting by 45.1% (182676 versus 125932) and in integer math by 34.2% (516920 versus 385290). Floating point math shows a 33.5% gap (287919 versus 215669). Data encryption favors the 7763 by 24.4% (121001 versus 97254), while data compression shows a narrower 15.3% margin (1628973 versus 1412835). Extended instructions see a 14% delta (98294 versus 86189).

The Cinebench suite is remarkably consistent. Across R15, R20, and R23, both multi-core and single-core tests show a 27.2% advantage for the 7763, with R20 single-core slightly higher at 27.3%. Specifically, R15 multi-core is 7247 versus 5696, R20 multi-core is 30198 versus 23736, and R23 multi-core is 71902 versus 56516. Single-core scores are 1023 versus 804, 4263 versus 3350, and 10150 versus 7978 for R15, R20, and R23, respectively.

The closest margin is in PassMark single-thread, where the 7763 scores 2518 and the 8434P scores 2448, a mere 2.9% difference. This is the only test where the two chips are nearly on par, indicating that per-core efficiency in light single-threaded work is similar, despite the 8434P's newer architecture. The multithread PassMark score shows a 27.2% gap (84591 versus 66490), matching the Cinebench multi-core delta.

Overall, the average benchmark score tells a similar story: the 7763 averages 179916, while the 8434P averages 146881, a difference of roughly 22.5% in the 7763's favor. Both chips sit in the 98th percentile of all CPUs in the database, but the 7763's raw output is clearly higher across nearly every measured category.

Architecture Differences

The two processors represent different design philosophies and generations. The 7763 is part of the EPYC 7003 series, built on Zen 3 architecture with the codename Milan. It uses a 7 nm process from TSMC, with a transistor count of 33,200 million distributed across 8 dies, each measuring 81 mm². The 8434P belongs to the EPYC 8004 series, using Zen 4c architecture under the codename Siena. It is built on a more advanced 5 nm process, also from TSMC, with 35,500 million transistors spread across 4 dies, each 73 mm².

Core counts differ significantly. The 7763 offers 64 cores and 128 threads, while the 8434P provides 48 cores and 96 threads. Clock speeds also favor the 7763: it has a 2.45 GHz base clock and a 3.50 GHz boost clock, whereas the 8434P has a higher 2.50 GHz base but a lower 3.10 GHz boost. This explains the near-parity in single-thread PassMark scores, as the 8434P's higher base clock partially compensates for its lower boost.

Cache layouts are notably different. Both share 64 KB of L1 per core, but the 7763 has 512 KB of L2 per core, while the 8434P doubles that to 1 MB per core. The L3 cache, however, heavily favors the 7763: it has 256 MB shared, versus 128 MB shared on the 8434P. This 2x difference in L3 capacity is likely a major contributor to the 7763's dominance in cache-sensitive workloads like random string sorting and prime number finding.

Memory support is another generational split. The 7763 uses DDR4 memory with an eight-channel bus and a bandwidth of 204.8 GB/s. The 8434P moves to DDR5 with a six-channel bus, achieving a higher bandwidth of 230.4 GB/s despite fewer channels. Both support ECC memory. PCIe capabilities also differ: the 7763 offers Gen 4 with 128 lanes (CPU only), while the 8434P provides Gen 5 with 96 lanes (CPU only).

Sockets and physical packages differ as well. The 7763 uses AMD Socket SP3, while the 8434P uses the newer AMD Socket SP6. The 7763 was released on 2021-03-14, while the 8434P launched on 2023-09-17. The 8434P has a lower TDP of 200 watts versus the 7763's 280 watts, and its launch MSRP is $2700, while the 7763's launch MSRP is $7890.

FAQ

Q: Which processor wins in multi-core rendering workloads?

A: The AMD EPYC 7763 wins decisively. In Cinebench R23 multi-core, it scores 71902 versus the 8434P's 56516, a 27.2% advantage. The same margin appears in R20 multi-core (30198 versus 23736) and R15 multi-core (7247 versus 5696).

Q: Is the newer EPYC 8434P faster in single-threaded tasks?

A: No. The 7763 leads in single-thread performance across all recorded tests. In PassMark single-thread, the 7763 scores 2518 versus 2448, a 2.9% margin. In Cinebench R23 single-core, the 7763 scores 10150 versus 7978, a 27.2% advantage.

Q: How do the memory bandwidth figures compare?

A: The 8434P has a higher memory bandwidth at 230.4 GB/s with six-channel DDR5, while the 7763 provides 204.8 GB/s with eight-channel DDR4. Despite lower bandwidth, the 7763 still wins all memory-sensitive benchmarks in the database.

Q: What is the largest performance gap between the two?

A: The largest gap is in PassMark find prime numbers, where the 7763 scores 668 and the 8434P scores 298, a 124.2% difference. This is the only test where the 7763 more than doubles the 8434P's score.

Q: Do both processors support ECC memory?

A: Yes, both the 7763 and the 8434P have ECC memory support enabled in their specifications.

Q: Which processor has more L3 cache?

A: The 7763 has 256 MB of shared L3 cache, exactly double the 128 MB found on the 8434P. The 8434P compensates with a larger L2 cache of 1 MB per core, versus 512 KB per core on the 7763.

Specification Differences

| Specification | AMD EPYC 7763 | AMD EPYC 8434P |

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

| Series | EPYC 7003 series | EPYC 8004 series |

| Cores | 64 | 48 |

| Threads | 128 | 96 |

| Base Clock | 2.45 GHz | 2.50 GHz |

| Boost Clock | 3.50 GHz | 3.10 GHz |

| TDP | 280 W | 200 W |

| Socket | AMD Socket SP3 | AMD Socket SP6 |

| Architecture | Zen 3 | Zen 4c |

| Codename | Milan | Siena |

| Process Node | 7 nm | 5 nm |

| Transistors | 33,200 million | 35,500 million |

| Die Size | 8x 81 mm² | 4x 73 mm² |

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

| L3 Cache | 256 MB (shared) | 128 MB (shared) |

| Memory Support | DDR4 | DDR5 |

| Memory Bus | Eight-channel | Six-channel |

| Memory Bandwidth | 204.8 GB/s | 230.4 GB/s |

| PCIe | Gen 4, 128 Lanes (CPU only) | Gen 5, 96 Lanes (CPU only) |

| Release Date | 2021-03-14 | 2023-09-17 |

| Launch MSRP | $7890 | $2700 |

| Part Number | 100-000000312100-000000312WOF | 100-000000877 |

The two chips share identical L1 cache (64 KB per core), ECC support, a server/workstation market segment, active production status, and no integrated graphics. Both also have locked multipliers.

The Verdict

Based strictly on benchmark data, the AMD EPYC 7763 is the superior performer in every recorded test. It wins all 17 head-to-head comparisons, with margins ranging from 2.9% in single-thread PassMark to 124.2% in prime number finding. The 7763's average benchmark score of 179916 is notably higher than the 8434P's 146881, and its percentile ranking matches at 98th, but the raw score gap is substantial.

The 7763's advantages come from a combination of more cores (64 versus 48), higher boost clock (3.50 GHz versus 3.10 GHz), and double the L3 cache (256 MB versus 128 MB). These factors dominate in multi-threaded, cache-heavy, and physics-based workloads. The 8434P's higher base clock (2.50 GHz versus 2.45 GHz) and newer 5 nm process do not translate into any benchmark win, though they do narrow the single-thread gap to a small 2.9%.

However, the 8434P is not without merits. It has a lower TDP of 200 watts versus 280 watts, a higher memory bandwidth of 230.4 GB/s, and newer DDR5 and PCIe Gen 5 support. Its launch MSRP of $2700 is significantly lower than the 7763's $7890, though pricing is not a factor in performance analysis. For workloads that prioritize memory bandwidth per watt or newer I/O capabilities, the 8434P offers structural advantages, but the recorded data shows no performance test where it comes out ahead.

The verdict is clear: for raw compute performance across all measured categories, the EPYC 7763 is the pick. The EPYC 8434P is the choice only when the platform features (DDR5, PCIe Gen 5, lower power envelope) matter more than benchmark scores, or when the workload is heavily dependent on single-thread performance, where the gap is minimal.

Where Each One Wins

The AMD EPYC 7763 wins in every benchmark category recorded in the database, but the degree of dominance varies by workload type.

Multi-core and parallel workloads: The 7763 is the clear choice. Cinebench R23 multi-core shows a 27.2% lead, and PassMark multithread shows the same 27.2% margin. Integer math (34.2% ahead) and floating point math (33.5% ahead) both strongly favor the 7763. These workloads benefit from the 7763's 64 cores and 128 threads, which outnumber the 8434P's 48 cores and 96 threads.

Cache-sensitive workloads: The 7763's 256 MB L3 cache pays off significantly. Random string sorting shows a 45.1% advantage, and find prime numbers shows a 124.2% advantage. Data compression (15.3%) and data encryption (24.4%) also favor the 7763. Any workload that fits within the larger L3 cache will see outsized gains on the 7763.

Physics and simulation: PassMark physics shows a 91% lead for the 7763 (7708 versus 4036). This suggests the 7763's higher boost clock and larger cache handle physics calculations far more efficiently than the 8434P's architecture.

Single-threaded tasks: The 7763 still wins, but the margin is narrow. PassMark single-thread shows just a 2.9% gap (2518 versus 2448). Cinebench single-core tests show a larger 27.2% gap, but the PassMark result indicates that for light, single-threaded operations, the two are nearly equivalent. The 8434P's higher base clock of 2.50 GHz helps it stay competitive here, despite its lower 3.10 GHz boost.

The EPYC 8434P's niche: While it wins no benchmarks, the 8434P's recorded specifications point to areas where it could be preferred. Its 230.4 GB/s memory bandwidth exceeds the 7763's 204.8 GB/s, and it supports DDR5 and PCIe Gen 5, which the 7763 does not. Its 200 watt TDP is 80 watts lower, and its 5 nm process with 35,500 million transistors over 4 dies suggests better power efficiency. For deployments where memory bandwidth per watt or modern I/O standards are critical, the 8434P offers structural advantages, even if the benchmark data does not translate them into wins.

In summary, the 7763 is the performance king across all 17 measured tests, with its largest wins in prime number finding (124.2%), physics (91%), and random string sorting (45.1%). The 8434P is the more modern platform with newer memory and PCIe standards, but the data shows it cannot match the 7763 in any compute benchmark.