AMD EPYC 7643P vs AMD EPYC 7763 Comparison

Head-to-Head Benchmarks

The benchmark data splits these two AMD EPYC processors into a predictable pattern: the 7763 dominates almost every multithreaded and math-heavy workload, while the 7643P takes single-threaded and physics tasks. Across 17 recorded tests, the 7763 wins 14, the 7643P wins 3.

The largest margin belongs to the 7763 in PassMark extended instructions, where it scores 98,294 versus 67,398, a 45.8% lead. That is a massive gap for instruction-heavy workloads like cryptography or vectorized code. Floating-point math also heavily favors the 7763: 287,919 against 216,592, a 32.9% advantage. Integer math follows the same trend at 516,920 versus 390,775, a 32.3% edge. Data encryption shows a 26.6% gap (121,001 vs 95,606), and data compression is 22.8% ahead (1,628,973 vs 1,326,051).

The Cinebench suite tells a consistent story. In R15 multicore, the 7763 scores 7,247 versus 6,623, a 9.4% win. R20 multicore repeats the exact same 9.4% delta: 30,198 versus 27,598. R23 multicore shows 71,902 against 65,710, also 9.4% ahead. Single-core Cinebench results are nearly identical in margin: R15 single-core is 1,023 versus 934 (9.5% for the 7763), R20 single-core is 4,263 versus 3,895 (9.4%), and R23 single-core is 10,150 versus 9,276 (9.4%). So across all six Cinebench tests, the 7763 holds a uniform 9.4% to 9.5% advantage. That consistency suggests a core-count scaling effect rather than an architectural difference.

PassMark multithread shows the 7763 at 84,591 versus 77,307, again a 9.4% lead. Random string sorting favors the 7763 by 14% (182,676 vs 160,274). Find prime numbers is close: 668 versus 651, only a 2.6% edge for the 7763.

The 7643P's wins are narrower but real. PassMark single-thread scores 2,655 versus 2,518, a 5.2% advantage. That is the largest single-threaded victory for the 7643P, and it appears twice in the dataset under two different test names with identical scores. PassMark physics also goes to the 7643P: 8,002 versus 7,708, a 3.7% margin. These are the only two tests where the 7643P pulls ahead, and both are single-core or lightly threaded workloads.

For context against the broader market, the 7763 sits at the 98th percentile of all CPUs with an average benchmark score of 179,916. Its nearest rival, the AMD Ryzen Threadripper PRO 9975WX, scores 182,700 (1.5% higher). The Intel Xeon 6740P trails by 2.1% at 176,227. The 7643P also sits at the 98th percentile, averaging 144,824. Its closest competitor is the Intel Xeon w9-3575X at 144,323, a 0.3% difference. The AMD Ryzen 9 PRO 9965 is 0.6% ahead at 145,728.

FAQ

Q: Which CPU wins more benchmark tests overall?

A: The AMD EPYC 7763 wins 14 of 17 recorded tests. The AMD EPYC 7643P wins 3.

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

A: The largest delta is in PassMark extended instructions, where the 7763 leads by 45.8% (98,294 vs 67,398).

Q: Does the 7643P win anything meaningful?

A: Yes, it wins PassMark single-thread by 5.2% (2,655 vs 2,518) and PassMark physics by 3.7% (8,002 vs 7,708). These are the only tests where it overtakes the 7763.

Q: How do they compare in Cinebench R23 multicore?

A: The 7763 scores 71,902 versus 65,710 for the 7643P, a 9.4% advantage for the 7763.

Q: Are both CPUs in the same market tier?

A: Both are in the EPYC 7003 series, use Zen 3 (Milan) architecture, and sit at the 98th percentile of all CPUs. However, their average benchmark scores differ significantly: 179,916 for the 7763 versus 144,824 for the 7643P.

Q: Do they share the same memory and PCIe capabilities?

A: Yes, both support DDR4 memory with an eight-channel bus and 204.8 GB/s bandwidth. Both also provide Gen 4 PCIe with 128 lanes (CPU only).

Architecture Differences

Both processors are built on Zen 3 architecture with the Milan codename, fabricated on TSMC's 7 nm process. The die size is identical at 8x 81 mm², and both pack 33,200 million transistors. The cache hierarchy is also the same: 64 KB L1 per core, 512 KB L2 per core, and 256 MB of shared L3 cache. ECC memory is supported on both, and neither has integrated graphics.

The critical difference is core count. The 7763 has 64 cores and 128 threads, while the 7643P has 48 cores and 96 threads. That is a 16-core / 32-thread gap. The base clocks differ slightly: the 7763 runs at 2.45 GHz, the 7643P at 2.30 GHz. Boost clocks flip the relationship: the 7643P boosts to 3.60 GHz, while the 7763 boosts to 3.50 GHz. This explains the 7643P's single-thread wins despite having fewer cores.

TDP also separates them. The 7763 is rated at 280 watts, the 7643P at 225 watts. Both use the AMD Socket SP3 and are not multiplier unlocked. The 7763 launched on March 14, 2021, while the 7643P launched over two years later on September 4, 2023. Both remain in active production.

The launch MSRP differs substantially: the 7763 launched at $7890, the 7643P at $2722. Both are part numbers from the same EPYC 7003 family, with the 7763 carrying part number 100-000000312WOF and the 7643P carrying 100-000001285.

The Verdict

The data points to a clear split by workload type. If the job is heavily multithreaded, the 7763 is the stronger choice. It leads by 9.4% in every Cinebench multicore test and by 9.4% in PassMark multithread. The advantage grows much larger in specialized math and encryption tasks: 32.9% in floating-point math, 32.3% in integer math, 26.6% in data encryption, and 45.8% in extended instructions. For any server workload that scales across cores, the 7763's additional 16 cores translate directly into measurable wins.

If the workload is single-threaded or physics-based, the 7643P takes the edge. It wins PassMark single-thread by 5.2% and PassMark physics by 3.7%. The higher boost clock of 3.60 GHz versus 3.50 GHz likely drives these results. The 7643P also consumes less power at 225 watts TDP versus 280 watts, which matters for dense server deployments.

The 7763's average benchmark score of 179,916 sits 24% above the 7643P's 144,824. Its nearest rivals include the Threadripper PRO 9975WX (1.5% higher) and the Xeon 6740P (2.1% lower). The 7643P competes with the Xeon w9-3575X (0.3% higher) and the Ryzen 9 PRO 9965 (0.6% higher). Both hold the 98th percentile ranking, but the 7763 operates in a higher performance tier.

The launch MSRP tells a similar story: $7890 for the 7763 versus $2722 for the 7643P. The 7763 costs more because it delivers more cores and significantly higher throughput. The 7643P offers a lower entry point while still maintaining competitive single-threaded performance.

Specification Differences

| Field | AMD EPYC 7763 | AMD EPYC 7643P |

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

| Cores | 64 | 48 |

| Threads | 128 | 96 |

| Base Clock | 2.45 GHz | 2.30 GHz |

| Boost Clock | 3.50 GHz | 3.60 GHz |

| TDP | 280 W | 225 W |

| Release Date | 2021-03-14 | 2023-09-04 |

| Launch MSRP | $7890 | $2722 |

| Part Number | 100-000000312WOF | 100-000001285 |

All other recorded specifications are identical: 7 nm process, Zen 3 Milan architecture, 33,200 million transistors, 8x 81 mm² die size, 64 KB L1 per core, 512 KB L2 per core, 256 MB shared L3, DDR4 memory with eight-channel support, 204.8 GB/s memory bandwidth, ECC memory, Gen 4 PCIe with 128 lanes, AMD Socket SP3, and no integrated graphics.

Where Each One Wins

Choose the AMD EPYC 7763 for:

• Heavy multithreaded rendering or simulation. Cinebench R23 multicore shows 71,902 versus 65,710, a 9.4% edge.
• Encryption and compression tasks. Data encryption leads by 26.6%, data compression by 22.8%.
• Floating-point and integer math workloads. The 7763 is 32.9% and 32.3% ahead respectively.
• Extended instruction sets, where it wins by 45.8%, the largest recorded gap.
• Any workload that can use all 64 cores and 128 threads. The multithread score of 84,591 beats 77,307.

Choose the AMD EPYC 7643P for:

• Single-threaded applications. PassMark single-thread shows 2,655 versus 2,518, a 5.2% win.
• Physics simulations that rely on fewer cores. The 7643P scores 8,002 versus 7,708, a 3.7% margin.
• Power-constrained deployments. Its 225 watt TDP is 55 watts lower than the 7763.
• Workloads where the higher boost clock of 3.60 GHz matters more than raw core count.

The 7643P also delivers competitive performance against its own rivals: it sits within 1% of the Xeon w9-3575X and Ryzen 9 PRO 9965. The 7763 sits within 1.5% of the Threadripper PRO 9975WX, making both CPUs strong options in their respective segments. The deciding factor is core utilization: use all the cores and the 7763 wins; use a few cores and the 7643P takes the lead.