AMD EPYC 7643P vs AMD EPYC 7C13 Comparison

The Verdict

The benchmark data presents a clear split between AMD EPYC 7C13 and AMD EPYC 7643P, each taking a distinct set of workloads. The EPYC 7643P wins 12 of the 17 head-to-head comparisons, while the EPYC 7C13 takes 5. The EPYC 7643P dominates single-threaded and general multithreaded workloads, with the EPYC 7C13 countering in specific math and data-processing tasks.

For users running Cinebench-style rendering or general multithreaded applications, the EPYC 7643P is the stronger choice. Its wins in Cinebench R15, R20, and R23 multicore tests are narrow but consistent, with deltas ranging from -1.2% to -1.3% in favor of the 7643P. The 7643P also wins the PassMark multithread test, scoring 77307 against 76322, a -1.3% delta. These small margins suggest that for rendering workloads, the two processors are nearly interchangeable, but the 7643P has the edge.

For integer-heavy and floating-point math, the EPYC 7C13 is clearly superior. The 7C13 leads by 26% in PassMark integer math, 23.2% in floating-point math, 26.2% in extended instructions, 20% in data encryption, and 17.8% in data compression. These are substantial margins, not the small single-digit differences seen in the Cinebench tests. The 7C13's 64 cores versus the 7643P's 48 cores likely drive these wins, even though the 7643P has higher clock speeds.

The EPYC 7643P also wins in physics and random string sorting by significant margins: 38.7% and 18% respectively. The 7643P's find prime numbers score is 17.2% higher. These results indicate that for certain algorithmic workloads, the 7643P's per-core efficiency matters more than raw core count.

The average benchmark score tells a different story. The EPYC 7C13 has an average benchmark score of 167788, placing it in the 98th percentile, while the EPYC 7643P has an average score of 144824, also in the 98th percentile. The 7C13 sits between the AMD Ryzen Threadripper PRO 3995WX at 171748 (-2.3% delta) and the AMD EPYC 9375F at 162497 (+3.3% delta). The 7643P sits between the AMD Ryzen 9 PRO 9965 at 145728 (-0.6% delta) and the Intel Xeon w9-3575X at 144323 (+0.3% delta). This places the 7C13 in a higher overall performance tier despite losing many individual head-to-head tests. The 7C13's wins in math-heavy workloads lift its average score above the 7643P's.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7C13 has 64 cores and 128 threads. The AMD EPYC 7643P has 48 cores and 96 threads. Both are server/workstation processors on the AMD Socket SP3 platform.

Q: How do the two compare in single-core performance?

A: The EPYC 7643P wins all single-core tests. In Cinebench R15 single-core, it scores 934 versus 923 for the 7C13, a -1.2% delta. In Cinebench R20 single-core, it scores 3895 versus 3846, a -1.3% delta. In Cinebench R23 single-core, it scores 9276 versus 9158, also -1.3%. The PassMark single-thread test shows 2655 versus 2618, a -1.4% delta.

Q: Which processor performs better in encryption workloads?

A: The EPYC 7C13 wins PassMark data encryption by 20%, scoring 114769 against 95606. This is one of the 7C13's five head-to-head wins.

Q: What is the launch MSRP of the EPYC 7643P?

A: The launch MSRP of the AMD EPYC 7643P is $2722. The EPYC 7C13 has no launch MSRP recorded in the database.

Q: How do the two processors compare in Cinebench R23 multicore?

A: The EPYC 7643P wins with a score of 65710 versus 64873 for the 7C13, a -1.3% delta. This is consistent with the other Cinebench multicore results, where the 7643P wins by roughly 1.3%.

Q: What is the average benchmark score difference between the two?

A: The EPYC 7C13 has an average benchmark score of 167788, while the EPYC 7643P has 144824. The 7C13's average is higher despite losing most head-to-head tests, because its wins in math and data workloads are much larger (up to 26.2%) than the 7643P's wins (mostly around 1.3%).

Architecture Differences

Both processors share the same fundamental architecture. Both use Zen 3, with the codename Milan, and belong to the EPYC Zen 3 (Milan) generation. Both are manufactured by TSMC on a 7 nm process node. Both use 33,200 million transistors on a die size of 8x 81 mm². Both support DDR4 memory with an eight-channel memory bus and 204.8 GB/s memory bandwidth. Both support ECC memory. Both have PCIe Gen 4 with 128 lanes (CPU only). Both lack integrated graphics. Both have locked multipliers.

The cache layout is identical: 64 KB L1 per core, 512 KB L2 per core, and 256 MB shared L3. Neither has 3D V-Cache. The difference in cores (64 versus 48) is the primary architectural distinction, though both share the same per-core cache design.

The EPYC 7643P belongs to the EPYC 7003 series, while the EPYC 7C13 has no series designation recorded. The 7643P has a part number of 100-000001285, while the 7C13 has 100-000000315. The 7643P has a release date of September 4, 2023; the 7C13 has no release date recorded. Both are listed as active in production.

Specification Differences

The base clock differs: the EPYC 7C13 runs at 2000.00 MHz, while the EPYC 7643P runs at 2.30 GHz. The boost clock also differs: the 7C13 boosts to 3.68 GHz, while the 7643P boosts to 3.60 GHz. This means the 7C13 has a higher boost clock but a lower base clock. The 7643P has a higher base clock by 300 MHz but a lower boost clock by 80 MHz.

Core and thread counts differ as noted: 64 cores and 128 threads for the 7C13, 48 cores and 96 threads for the 7643P. Both have a TDP of 225 watts. Both use the AMD Socket SP3.

The 7643P has a launch MSRP of $2722; the 7C13 has no launch MSRP recorded. The 7643P has a release date of September 4, 2023; the 7C13 has no release date recorded.

The 7643P belongs to the EPYC 7003 series; the 7C13 has no series designation. All other specifications, including memory support, memory bus, memory bandwidth, ECC support, PCIe lanes, process node, foundry, transistors, die size, and cache, are identical between the two.

Head-to-Head Benchmarks

The EPYC 7643P wins every Cinebench test. In Cinebench R15 multicore, the 7643P scores 6623 against 6539 for the 7C13, a -1.3% delta. In R15 single-core, the 7643P scores 934 against 923, a -1.2% delta. In R20 multicore, the 7643P scores 27598 against 27246, a -1.3% delta. In R20 single-core, the 7643P scores 3895 against 3846, a -1.3% delta. In R23 multicore, the 7643P scores 65710 against 64873, a -1.3% delta. In R23 single-core, the 7643P scores 9276 against 9158, also -1.3%. These results are remarkably consistent, with the 7643P winning every Cinebench test by roughly 1.3% regardless of core count or test version.

The PassMark multithread test follows the same pattern: the 7643P scores 77307 against 76322, a -1.3% delta. The PassMark single-thread test shows the 7643P at 2655 versus 2618, a -1.4% delta. The PassMark singlethread test (a duplicate) shows the same scores.

The EPYC 7C13's wins are larger and more varied. In PassMark integer math, the 7C13 scores 492554 against 390775, a 26% delta. In PassMark extended instructions, the 7C13 scores 85034 against 67398, a 26.2% delta. In PassMark floating-point math, the 7C13 scores 266846 against 216592, a 23.2% delta. In PassMark data encryption, the 7C13 scores 114769 against 95606, a 20% delta. In PassMark data compression, the 7C13 scores 1562251 against 1326051, a 17.8% delta.

The EPYC 7643P wins PassMark find prime numbers with 651 against 539, a -17.2% delta. It wins PassMark physics with 8002 against 4904, a -38.7% delta, the largest margin in either direction. It wins PassMark random string sorting with 160274 against 131361, an -18% delta.

The largest wins for each processor are telling. The 7643P's biggest win is physics at 38.7%, followed by random string sorting at 18% and find prime numbers at 17.2%. The 7C13's biggest wins are extended instructions at 26.2%, integer math at 26%, and floating-point math at 23.2%. The 7C13's wins are clustered in math and data-processing, while the 7643P's wins span physics, sorting, and prime number calculation.

Where Each One Wins

The EPYC 7C13 wins where core count and parallel math throughput matter. Its 64 cores give it a decisive advantage in integer math (26% ahead), floating-point math (23.2% ahead), and extended instructions (26.2% ahead). For data compression, the 7C13 leads by 17.8%, and for data encryption by 20%. These workloads scale with core count, and the 7C13's extra 16 cores deliver substantial gains. The average benchmark score of 167788 places it in a higher tier than the 7643P's 144824, confirming that for aggregate performance across math-heavy tasks, the 7C13 is stronger.

The EPYC 7643P wins where per-core efficiency and higher base clock matter. Its 2.30 GHz base clock versus 2000.00 MHz for the 7C13 likely contributes to wins in single-threaded tests, where it beats the 7C13 by 1.2% to 1.4% across Cinebench R15, R20, R23, and PassMark. The 7643P also wins every Cinebench multicore test by 1.3%, suggesting that for rendering workloads, the higher base clock compensates for the lower core count. The physics win of 38.7% is the most dramatic example of the 7643P's per-core advantage, as is the 18% win in random string sorting and the 17.2% win in find prime numbers.

The overall picture is that the 7C13 is the better choice for math-heavy, data-intensive workloads where core count dominates, while the 7643P is better for rendering, physics, and single-threaded tasks. The 7C13's average benchmark score is 15.8% higher than the 7643P's, but the 7643P wins 12 of 17 individual tests. Users should choose based on workload mix: the 7C13 for compute-heavy math and encryption, the 7643P for general rendering and physics simulation.