AMD EPYC 7643P vs AMD Ryzen Threadripper PRO 5975WX Comparison

The AMD EPYC 7643P and the AMD Ryzen Threadripper PRO 5975WX are both Zen 3 based, eight-channel monsters aimed at heavy professional workloads, but they are tuned for different corners of the market. The EPYC 7643P brings 48 cores to the SP3 server platform, while the Threadripper PRO 5975WX counters with 32 faster-clocked cores on the WRX8 workstation platform. The benchmark data shows a surprisingly close contest in raw throughput, with the EPYC taking 14 of 17 head-to-head tests, but the Threadripper scoring decisive wins in specific instruction-level and single-threaded workloads.

Head-to-Head Benchmarks

The most striking pattern in the head-to-head results is how consistent the EPYC 7643P is in Cinebench. Across all six Cinebench tests, the EPYC wins by exactly 2.6 percent. In Cinebench R23 multicore, the EPYC scores 65710 against 64021, and in single-core it posts 9276 versus 9038. The R20 results mirror this: 27598 versus 26888 multicore, 3895 versus 3795 single-core. Even R15 follows the same script, with the EPYC ahead at 6623 versus 6453 multicore and 934 versus 910 single-core. The margin is uniform, which suggests the EPYC's 16 extra cores are just barely outweighing the Threadripper's higher clocks in this rendering workload.

The PassMark suite tells a more varied story. The EPYC 7643P wins data compression with 1326051 against 1293784, a 2.5 percent edge, and takes floating point math 216592 to 202363, a 7 percent margin. Integer math goes to the EPYC by 8.5 percent, 390775 versus 360156, and multithread scoring lands at 77307 versus 75319, another 2.6 percent win. The biggest EPYC wins come in physics, where it scores 8002 against 4360, a massive 83.5 percent advantage, and in prime number finding, where it leads 651 to 438, a 48.6 percent gap. Random string sorting also favors the EPYC heavily, 160274 versus 123527, a 29.7 percent lead.

The Threadripper PRO 5975WX has two notable victories. PassMark single-thread scoring goes to the Threadripper at 3323 versus 2655, a 20.1 percent advantage, which is a substantial margin that reflects its higher boost clock. The other win is in extended instructions, where the Threadripper posts 82850 against 67398, an 18.7 percent lead. Data encryption is the closest of the EPYC wins at 95606 versus 80453, an 18.8 percent margin that still favors the server chip.

Architecture Differences

Both processors are built on the Zen 3 architecture at TSMC's 7 nm process, but their physical layouts diverge significantly. The EPYC 7643P uses eight CCDs, each 81 mm², totaling 33,200 million transistors. The Threadripper PRO 5975WX uses four CCDs of the same 81 mm² size, totaling 16,600 million transistors. That difference in chiplet count explains the EPYC's 48 cores and 96 threads versus the Threadripper's 32 cores and 64 threads.

Cache configuration is another separator. Both have 64 KB of L1 and 512 KB of L2 per core, but the L3 totals differ. The EPYC 7643P carries 256 MB of shared L3, while the Threadripper PRO 5975WX has 128 MB. This means the EPYC has twice the last-level cache, which is a major factor in its physics and prime number test dominance.

Clock speeds favor the Threadripper. The EPYC runs at a 2.30 GHz base and 3.60 GHz boost, while the Threadripper runs at 3.60 GHz base and 4.50 GHz boost. That 0.9 GHz boost advantage is directly visible in the single-thread and extended instruction results. The Threadripper also carries a higher TDP at 280 watts against the EPYC's 225 watts, which reflects its aggressive clock tuning.

The platforms are entirely different. The EPYC uses Socket SP3, while the Threadripper uses Socket WRX8. Both support DDR4 memory across eight channels with 204.8 GB/s of bandwidth and both have ECC support. PCIe is identical on paper: Gen 4 with 128 lanes from the CPU. Neither has integrated graphics, and neither has an unlocked multiplier. The EPYC released in September 2023, while the Threadripper launched in March 2022, so the EPYC is the newer design.

Where Each One Wins

The EPYC 7643P is the clear choice for heavily parallel, cache-hungry workloads. Its 83.5 percent win in PassMark physics points to workloads that scale with core count and L3 capacity. The 48.6 percent lead in prime number finding reinforces this, as does the 29.7 percent edge in random string sorting. For integer math, the EPYC's 8.5 percent margin shows it handles general compute tasks well despite lower clocks. Data encryption at 18.8 percent ahead is notable for server-side security workloads, and the 2.5 percent compression win keeps it ahead in storage-related tasks.

The Threadripper PRO 5975WX wins where clock speed matters more than core count. The 20.1 percent single-thread advantage makes it better for lightly threaded applications, legacy software, or any task where a single core is the bottleneck. The 18.7 percent lead in extended instructions suggests it handles AVX-style workloads and specialized instruction sets more efficiently, which is relevant for scientific computing, media encoding, and certain simulation codes that rely on wide vector units.

The Cinebench results are too close to call a winner by use case. Both processors deliver essentially the same rendering performance, with the EPYC ahead by a consistent but small 2.6 percent. For anyone rendering on a deadline, either chip will do the job at nearly the same speed, so other factors like platform features or ecosystem fit will decide.

The Verdict

The data points to a simple conclusion: choose the EPYC 7643P if your work scales across many cores and benefits from a large shared cache, and choose the Threadripper PRO 5975WX if you need maximum single-thread performance and strong extended instruction throughput. The EPYC wins 14 of 17 tests and holds a 98th percentile ranking among all CPUs, while the Threadripper sits at the 97th percentile. The EPYC's average benchmark score of 144824 also exceeds the Threadripper's 124171, a gap that reflects the EPYC's broader wins in the PassMark suite.

The EPYC's nearest rivals in the database include the Intel Xeon w9-3575X at 0.3 percent behind, the AMD Ryzen 9 PRO 9965 at 0.6 percent ahead, and the AMD Ryzen 9 PRO 9965X3D at 0.8 percent behind, placing it in a tight performance cluster. The Threadripper's rivals tell a similar story: the AMD EPYC 7642 is 0.1 percent behind, the Intel Xeon 6730P is 0.5 percent ahead, and the AMD EPYC 9354 is 2.1 percent ahead. Both chips sit in competitive neighborhoods, but the EPYC's higher average score gives it the edge in overall capability.

For a server rack, the EPYC 7643P is the obvious pick. Its 48 cores, 256 MB of L3, and 18.8 percent encryption win make it well suited for virtualized environments, databases, and security services. For a workstation, the Threadripper PRO 5975WX makes more sense. Its single-thread performance and extended instruction lead will feel snappier in interactive applications, and its 4.50 GHz boost clock is a tangible benefit for code compilation, simulation preprocessing, and other serial stages of a larger pipeline.

FAQ

Q: Which processor has more cores?

A: The AMD EPYC 7643P has 48 cores and 96 threads, while the AMD Ryzen Threadripper PRO 5975WX has 32 cores and 64 threads.

Q: Which processor has a higher boost clock?

A: The AMD Ryzen Threadripper PRO 5975WX boosts to 4.50 GHz, while the AMD EPYC 7643P boosts to 3.60 GHz.

Q: How much L3 cache does each processor have?

A: The AMD EPYC 7643P has 256 MB of shared L3 cache, while the AMD Ryzen Threadripper PRO 5975WX has 128 MB.

Q: What is the largest benchmark margin in the head-to-head results?

A: The AMD EPYC 7643P wins PassMark physics by 83.5 percent, scoring 8002 against the Threadripper's 4360.

Q: Which processor wins in single-thread performance?

A: The AMD Ryzen Threadripper PRO 5975WX wins PassMark single-thread by 20.1 percent, scoring 3323 against the EPYC's 2655.

Q: Do both processors support the same memory configuration?

A: Yes, both support DDR4 across eight channels with 204.8 GB/s of bandwidth and ECC memory.

Specification Differences

| Specification | AMD EPYC 7643P | AMD Ryzen Threadripper PRO 5975WX |

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

| Cores | 48 | 32 |

| Threads | 96 | 64 |

| Base Clock | 2.30 GHz | 3.60 GHz |

| Boost Clock | 3.60 GHz | 4.50 GHz |

| TDP | 225 W | 280 W |

| Socket | AMD Socket SP3 | AMD Socket WRX8 |

| Codename | Milan | Chagall PRO |

| Transistors | 33,200 million | 16,600 million |

| Die Size | 8x 81 mm² | 4x 81 mm² |

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

| Release Date | 2023-09-04 | 2022-03-07 |

| Launch MSRP | $2722 | $3299 |

| Part Number | 100-000001285 | 100-000000445 |