AMD EPYC 7643P vs AMD Ryzen Threadripper PRO 9975WX Comparison

The AMD Ryzen Threadripper PRO 9975WX and the AMD EPYC 7643P are two very different processors aimed at demanding workstation and server workloads. The Threadripper PRO is a 32-core Zen 5 part built for high-frequency, single-thread-sensitive tasks, while the EPYC 7643P is a 48-core Zen 3 part designed for dense multi-threaded server environments. The benchmark data reveals a clear split: the Threadripper PRO dominates in most measured tests, while the EPYC holds specific advantages in a few niche workloads. This analysis breaks down the recorded head-to-head results, explains what they mean for real-world use, and highlights the architectural and specification differences that drive these outcomes.

Head-to-Head Benchmarks

Across the 17 recorded benchmark comparisons, the AMD Ryzen Threadripper PRO 9975WX wins 14 tests, while the AMD EPYC 7643P takes 3. The most striking margin comes in single-thread performance. In the Cinebench R15 single-core test, the Threadripper PRO scores 1331 against the EPYC's 934, a 42.5% advantage. That gap repeats across the Cinebench suite: R20 single-core shows 5546 versus 3895, and R23 single-core shows 13207 versus 9276, both at 42.4% differences. The PassMark single-thread test is even more lopsided: the Threadripper PRO scores 4408, the EPYC scores 2655, a 66% lead. These results come directly from the higher boost clock and newer Zen 5 architecture, as the recorded clocks show 5.40 GHz for the Threadripper PRO versus 3.60 GHz for the EPYC.

Multi-threaded Cinebench results also favor the Threadripper PRO despite its lower core count. In Cinebench R15 multi-core, the Threadripper PRO scores 9430 against 6623, a 42.4% win. R20 multi-core shows 39292 versus 27598, and R23 multi-core shows 93553 versus 65710, both with identical 42.4% deltas. This is notable because the EPYC has 48 cores and 96 threads versus 32 cores and 64 threads, yet the Threadripper PRO still leads by over 40% in these rendering-style workloads. The reason is not just clock speed; the Threadripper PRO's Zen 5 cores, 4 nm process, and 128 MB of L3 cache provide a substantial per-core throughput advantage.

PassMark tests show a similar pattern, though with varying margins. The Threadripper PRO wins floating point math with 304833 versus 216592, a 40.7% lead. Integer math shows 461724 versus 390775, an 18.2% advantage. Data compression goes to the Threadripper PRO at 1644573 versus 1326051, a 24% win. Random string sorting favors the Threadripper PRO at 188014 versus 160274, a 17.3% margin. The PassMark multi-thread score is 104902 for the Threadripper PRO versus 77307 for the EPYC, a 35.7% gain. Extended instructions are the biggest single win for the Threadripper PRO: 137733 versus 67398, a 104.4% advantage, meaning it more than doubles the EPYC's score in that workload.

The AMD EPYC 7643P wins three tests, all in PassMark. Data encryption goes to the EPYC with 95606 versus 85035, an 11.1% lead. Find prime numbers favors the EPYC at 651 versus 620, a 4.8% margin. Physics also goes to the EPYC at 8002 versus 7288, an 8.9% advantage. These wins suggest the EPYC's higher core count and Zen 3 architecture handle certain integer-heavy or specialized instruction patterns slightly better, but the margins are modest compared to the Threadripper PRO's wins.

Looking at the overall average benchmark score, the Threadripper PRO records 182700, while the EPYC records 144824. That puts the Threadripper PRO roughly 26% higher on average, although the database's nearest rival comparisons show the Threadripper PRO sits close to the AMD EPYC 8534P, which scores 185092 and is 1.3% ahead, and the Intel Xeon 6740E, which scores 187718 and is 2.7% ahead. The EPYC 7643P, by contrast, is nearly tied with the Intel Xeon w9-3575X, which scores 144323 and is 0.3% behind, and the AMD Ryzen 9 PRO 9965, which scores 145728 and is 0.6% ahead. Both processors rank in the 98th percentile among all CPUs, so either choice places a system in the top tier of available hardware.

The Verdict

The data shows a clear winner for most use cases: the AMD Ryzen Threadripper PRO 9975WX. If your workload involves rendering, simulation, scientific computing, software compilation, or any task that benefits from high single-thread performance and strong multi-thread scaling, the Threadripper PRO is the superior choice. Its 42.4% lead across all Cinebench tests and 66% lead in PassMark single-thread means it will complete tasks faster in almost every measured scenario. The 104.4% advantage in extended instructions is particularly significant for workloads that use AVX-512 or similar instruction sets, as those can run at roughly double the speed of the EPYC.

The AMD EPYC 7643P is the better pick only for specific workloads where its wins matter. Data encryption, prime number finding, and physics simulations favor the EPYC by 11.1%, 4.8%, and 8.9% respectively. If your primary application is cryptographic processing, certain mathematical sieving tasks, or physics engines that match the PassMark physics test pattern, the EPYC's 48 cores and 96 threads provide a measurable edge. However, these are narrow niches. The EPYC also has a lower TDP of 225 watts versus 350 watts for the Threadripper PRO, which could matter in densely packed server racks where power density is a concern, but the Threadripper PRO's performance per watt in most tests is still superior.

For mixed workloads, the Threadripper PRO is the safer recommendation. It wins 14 of 17 tests, including all the Cinebench rendering tests and most PassMark arithmetic and memory-intensive tests. The EPYC is a capable server chip, but its architecture is older (Zen 3 versus Zen 5), its process node is larger (7 nm versus 4 nm), and its memory is slower (DDR4 versus DDR5). The only reason to choose the EPYC would be a workload that specifically matches its three winning tests, or a requirement for lower power consumption and a more established server platform with the Socket SP3 ecosystem.

FAQ

Q: Which processor has better single-thread performance?

A: The AMD Ryzen Threadripper PRO 9975WX is significantly ahead. In Cinebench R15 single-core, it scores 1331 versus 934 for the EPYC, a 42.5% lead. In PassMark single-thread, it scores 4408 versus 2655, a 66% advantage.

Q: Does the EPYC's higher core count make it faster in multi-threaded tests?

A: No, not in the recorded benchmarks. Despite having 48 cores and 96 threads versus 32 cores and 64 threads, the EPYC loses all three Cinebench multi-core tests by 42.4%. The Threadripper PRO scores 93553 in R23 multi-core versus 65710 for the EPYC.

Q: What are the EPYC's three wins?

A: The EPYC wins PassMark data encryption (95606 versus 85035, an 11.1% lead), PassMark find prime numbers (651 versus 620, a 4.8% margin), and PassMark physics (8002 versus 7288, an 8.9% advantage).

Q: How do the two compare in memory bandwidth?

A: The Threadripper PRO supports DDR5 with a recorded memory bandwidth of 409.6 GB/s, while the EPYC supports DDR4 with 204.8 GB/s. That is a 100% difference in theoretical bandwidth, favoring the Threadripper PRO.

Q: Which processor has a higher average benchmark score?

A: The Threadripper PRO has an average benchmark score of 182700, while the EPYC averages 144824. That puts the Threadripper PRO approximately 26% higher overall, though both rank in the 98th percentile among all CPUs.

Q: Is the EPYC a better choice for any specific server task?

A: Based on the data, the EPYC is better for encryption, prime number finding, and physics workloads. Its wins range from 4.8% to 11.1% in those tests, so if those are your primary tasks, the EPYC offers a measurable advantage.

Specification Differences

The two processors differ in several fundamental specifications. The AMD Ryzen Threadripper PRO 9975WX has 32 cores and 64 threads, while the AMD EPYC 7643P has 48 cores and 96 threads. The Threadripper PRO has a base clock of 4.00 GHz and a boost clock of 5.40 GHz, compared to 2.30 GHz base and 3.60 GHz boost for the EPYC. The Threadripper PRO has a TDP of 350 watts, while the EPYC is rated at 225 watts.

The Threadripper PRO uses the AMD Socket sTR5, while the EPYC uses AMD Socket SP3. The Threadripper PRO is based on the Zen 5 architecture with the codename Shimada Peak, part of the 9000 series, while the EPYC uses Zen 3 with the codename Milan, part of the EPYC 7003 series. The Threadripper PRO is built on a 4 nm process from TSMC with 33,260 million transistors and a die size of 4x 70.6 mm². The EPYC is on a 7 nm process with 33,200 million transistors and a die size of 8x 81 mm².

Memory support differs significantly: the Threadripper PRO uses DDR5 with eight-channel memory and 409.6 GB/s bandwidth, while the EPYC uses DDR4 with eight-channel memory and 204.8 GB/s bandwidth. Both support ECC memory. The PCIe interface also differs: the Threadripper PRO has PCIe Gen 5 with 128 lanes (CPU only), while the EPYC has PCIe Gen 4 with 128 lanes (CPU only).

The Threadripper PRO has an unlocked multiplier, while the EPYC is locked. The Threadripper PRO has a launch MSRP of $4099, while the EPYC has a launch MSRP of $2722. The Threadripper PRO was released on 2025-07-22, while the EPYC was released on 2023-09-04. The Threadripper PRO has no integrated graphics, and the EPYC also has no integrated graphics. The Threadripper PRO's market segment is Server/Workstation, as is the EPYC's. The Threadripper PRO has a part number of 100-000000723, and the EPYC has a part number of 100-000001285.

Architecture Differences

The architectural gap between these two AMD processors is substantial. The Threadripper PRO uses the Zen 5 microarchitecture, which is a major redesign from the Zen 3 in the EPYC. The process node has shrunk from 7 nm to 4 nm, allowing for higher clock speeds and better power efficiency. The Threadripper PRO's boost clock of 5.40 GHz is 1.80 GHz higher than the EPYC's 3.60 GHz, which directly explains its 66% lead in PassMark single-thread performance.

Cache configuration also differs. Both have 64 KB of L1 cache per core, but the L2 cache is 1 MB per core on the Threadripper PRO versus 512 KB per core on the EPYC. The L3 cache is 128 MB on the Threadripper PRO, while the EPYC has 256 MB shared L3. The larger L3 on the EPYC helps in certain data-heavy workloads, but the Threadripper PRO's faster cores and larger L2 compensate in most tests.

The memory subsystem is entirely different generations. The Threadripper PRO's DDR5 support with 409.6 GB/s bandwidth doubles the EPYC's DDR4 bandwidth of 204.8 GB/s. This affects any workload that is memory-bandwidth limited, such as large data set processing or virtual machine density. The PCIe generation also jumps from Gen 4 on the EPYC to Gen 5 on the Threadripper PRO, which matters for GPU connectivity and NVMe storage speeds.

The Threadripper PRO has an unlocked multiplier, meaning it can be overclocked, while the EPYC is locked. This is a significant feature for workstation users who want to extract additional performance, though the TDP of 350 watts already indicates a high-power part. The EPYC's lower TDP of 225 watts makes it easier to cool in dense server environments, but the Threadripper PRO's performance advantages in the benchmarks suggest that the extra power is well spent for most workloads.

The production status for both is active, meaning they are currently available. The Threadripper PRO is a newer design, released in 2025, while the EPYC dates from 2023. The transistor counts are nearly identical (33,260 million versus 33,200 million), but the die configuration differs: the Threadripper PRO uses 4 dies of 70.6 mm² each, while the EPYC uses 8 dies of 81 mm² each. This reflects the different manufacturing approaches and core densities. Overall, the Threadripper PRO represents a generational leap in IPC, clock speed, and memory technology, which is why it wins 14 of 17 benchmark comparisons despite having 16 fewer cores.