AMD EPYC 7643P vs AMD Ryzen Threadripper PRO 9965WX Comparison

The AMD Ryzen Threadripper PRO 9965WX and AMD EPYC 7643P occupy adjacent positions in the aggregate benchmark rankings, separated by a mere 1.4% in average score. The Threadripper PRO 9965WX posts an average benchmark score of 146814 against the EPYC 7643P’s 144824, yet the underlying test results reveal a starkly polarized performance profile. The data indicates that the Threadripper PRO 9965WX wins 14 of the 17 head-to-head comparisons, often by substantial margins, while the EPYC 7643P counters with a narrow set of victories in specific workloads. Both processors sit at the 98th percentile among all CPUs, but their architectural philosophies—one optimized for low-latency single-thread dominance, the other for raw core-count throughput—produce very different application outcomes.

Head-to-Head Benchmarks

The most dramatic disparity emerges in single-threaded tests. In PassMark single-thread performance, the Threadripper PRO 9965WX scores 4555 against the EPYC 7643P’s 2655, a 71.6% advantage. This gap is consistent across Cinebench iterations: R15 single-core shows 1152 versus 934 (23.3% delta), R20 single-core shows 4801 versus 3895 (23.3% delta), and R23 single-core shows 11431 versus 9276 (23.2% delta). The Threadripper’s higher clock speeds—4.20 GHz base and 5.40 GHz boost—relative to the EPYC’s 2.30 GHz base and 3.60 GHz boost explain this dominance, but the consistency of the ~23% margin across all Cinebench versions suggests a fundamental per-core efficiency advantage rather than a simple frequency scaling effect.

Multi-core Cinebench results tell a similar story, albeit with a surprising twist given the EPYC’s 48-core count versus the Threadripper’s 24. In Cinebench R23 multi-core, the Threadripper PRO 9965WX scores 80976 against 65710, a 23.2% lead. The pattern repeats in R20 (34009 versus 27598, 23.2%) and R15 (8162 versus 6623, 23.2%). This is counterintuitive—the EPYC has twice the cores—but the Threadripper’s Zen 5 architecture at a 4 nm process node evidently delivers far superior per-thread throughput. The PassMark multi-thread test reinforces this: 95346 versus 77307, a 23.3% victory for the Threadripper.

The most lopsided result in the entire dataset belongs to PassMark extended instructions, where the Threadripper PRO 9965WX scores 102589 against 67398, a 52.2% advantage. This suggests the Zen 5 core’s wider vector and SIMD execution units dramatically outperform Zen 3 in instruction-heavy workloads. PassMark physics also strongly favors the Threadripper: 11278 versus 8002, a 40.9% lead, indicating superior floating-point scheduling and branch prediction.

However, the EPYC 7643P is not without its own victories. The most significant is in PassMark data encryption, where it scores 95606 against the Threadripper’s 71873—a 24.8% advantage. This likely stems from the EPYC’s larger 256 MB shared L3 cache, which provides better locality for cryptographic workloads that frequently access large key tables. The EPYC also wins PassMark integer math (390775 versus 365422, 6.5% lead) and edges out data compression (1326051 versus 1314596, a 0.9% margin). These wins, while meaningful, are isolated pockets of strength against a processor that dominates 14 of 17 benchmarks.

Architecture Differences

The two processors are built on fundamentally different silicon generations. The Threadripper PRO 9965WX uses Zen 5 architecture (codename Shimada Peak) fabricated on a 4 nm process by TSMC, while the EPYC 7643P uses Zen 3 (codename Milan) on a 7 nm process, also from TSMC. The transistor counts are nearly identical—33,260 million for the Threadripper versus 33,200 million for the EPYC—but the die configuration differs: the Threadripper uses 4x 70.6 mm² chiplets, while the EPYC uses 8x 81 mm² chiplets. This means the EPYC spreads its transistors across more, larger dies, while the Threadripper concentrates them into fewer, smaller units with a more advanced process.

Core and thread counts diverge sharply. The Threadripper PRO 9965WX offers 24 cores and 48 threads, whereas the EPYC 7643P doubles that to 48 cores and 96 threads. Yet the Threadripper’s per-core L2 cache is 1 MB per core versus the EPYC’s 512 KB per core, and both share 64 KB of L1 per core. The L3 cache arrangement is inverted relative to core count: the Threadripper has 128 MB shared L3, while the EPYC has 256 MB shared L3. This gives the EPYC a total cache footprint advantage but at the cost of per-core bandwidth.

Memory support represents another generational leap. The Threadripper PRO 9965WX supports DDR5 with an eight-channel memory bus and 409.6 GB/s bandwidth, while the EPYC 7643P uses DDR4 with an eight-channel bus but only 204.8 GB/s bandwidth. Both support ECC memory, which is expected for server/workstation segments. PCIe capabilities also differ: the Threadripper provides Gen 5 with 128 CPU-only lanes, whereas the EPYC provides Gen 4 with the same 128 lanes. This halves the available interconnect bandwidth for the EPYC in systems that can leverage Gen 5 peripherals.

The Threadripper PRO 9965WX has an unlocked multiplier, making it overclockable, while the EPYC 7643P is locked. Power envelopes diverge as well: the Threadripper has a 350 W TDP versus the EPYC’s 225 W, reflecting its higher clock speeds and more aggressive power delivery. The Threadripper uses AMD Socket sTR5, while the EPYC uses AMD Socket SP3, meaning they are not platform-compatible. The Threadripper’s launch MSRP is $2899, and the EPYC’s is $2722.

The Verdict

The data presents a clear binary choice based on workload priorities. The Threadripper PRO 9965WX is the superior processor for any task that emphasizes single-thread performance, low-latency execution, or mixed workloads requiring fast response times. Its 71.6% lead in PassMark single-thread and consistent 23.2% Cinebench single-core margins make it the obvious pick for interactive workstation use, where per-core speed directly translates to application responsiveness. The 52.2% advantage in extended instructions further cements its position for scientific computing, simulation, and code compilation that rely on wide vector operations.

The EPYC 7643P, despite losing the overall benchmark count, retains a specific niche. Its 24.8% lead in data encryption and 6.5% lead in integer math suggest it handles cryptographic operations and certain integer-heavy backend tasks more efficiently. The 256 MB L3 cache and higher core count provide a larger working set for data compression, where it wins by a slim 0.9% margin. For server deployments that prioritize these specific workloads—such as database encryption at rest or large-scale integer calculations—the EPYC’s strengths are measurable.

The aggregate scores tell a nuanced story. The Threadripper’s average benchmark score of 146814 places it 1.4% ahead of the EPYC’s 144824, but this narrow margin masks the extreme variance in individual tests. The Threadripper is also 10.2% ahead of the AMD EPYC 9275F (133174) and 8.7% behind the AMD EPYC 9355P (160853), according to the nearest rival data. The EPYC 7643P, meanwhile, is 8.7% ahead of the EPYC 9275F and 10% behind the EPYC 9355P. Neither processor is the fastest in their class, but the Threadripper’s single-thread dominance is unmatched among these rivals.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7643P has 48 cores and 96 threads, while the AMD Ryzen Threadripper PRO 9965WX has 24 cores and 48 threads.

Q: How does single-thread performance compare between the two?

A: In PassMark single-thread, the Threadripper PRO 9965WX scores 4555 versus the EPYC 7643P’s 2655, a 71.6% advantage for the Threadripper.

Q: Which processor has higher memory bandwidth?

A: The Threadripper PRO 9965WX supports DDR5 with 409.6 GB/s bandwidth, while the EPYC 7643P supports DDR4 with 204.8 GB/s bandwidth.

Q: In which benchmark does the EPYC 7643P have its largest win?

A: The EPYC 7643P wins PassMark data encryption by 24.8%, scoring 95606 versus the Threadripper’s 71873.

Q: Are both processors in the same performance percentile?

A: Yes, both the Threadripper PRO 9965WX and EPYC 7643P are at the 98th percentile among all CPUs.

Q: What is the process node difference?

A: The Threadripper PRO 9965WX uses a 4 nm process, while the EPYC 7643P uses a 7 nm process, both fabricated by TSMC.

Where Each One Wins

The Threadripper PRO 9965WX wins across all Cinebench tests (R15, R20, R23, both single and multi-core), PassMark single-thread, PassMark multi-thread, PassMark extended instructions, PassMark floating-point math, PassMark physics, PassMark find prime numbers, and PassMark random string sorting. This broad dominance covers rendering, general productivity, floating-point calculations, and algorithmic workloads. The 23.2% to 23.3% margins in Cinebench suggest a consistent architectural advantage that scales across all core counts, while the 40.9% physics win and 52.2% extended instructions win indicate particular strength in simulation and vector-heavy tasks.

The EPYC 7643P wins PassMark data encryption, PassMark integer math, and PassMark data compression. Its 24.8% encryption advantage is its most pronounced victory, followed by a 6.5% integer math edge and a 0.9% compression margin. These wins point to workloads that benefit from larger L3 cache capacity (256 MB) and the broader core count—specifically cryptographic key handling, integer-heavy database operations, and compression algorithms that can leverage massive parallel thread pools.

Specification Differences

The two processors differ in nearly every specification field. Core count: 24 versus 48. Thread count: 48 versus 96. Base clock: 4.20 GHz versus 2.30 GHz. Boost clock: 5.40 GHz versus 3.60 GHz. TDP: 350 W versus 225 W. Socket: AMD Socket sTR5 versus AMD Socket SP3. Architecture: Zen 5 versus Zen 3. Codename: Shimada Peak versus Milan. Process node: 4 nm versus 7 nm. Transistor count: 33,260 million versus 33,200 million. Die size: 4x 70.6 mm² versus 8x 81 mm². L2 cache: 1 MB per core versus 512 KB per core. L3 cache: 128 MB shared versus 256 MB shared. Memory support: DDR5 versus DDR4. Memory bandwidth: 409.6 GB/s versus 204.8 GB/s. PCIe: Gen 5 versus Gen 4, both with 128 CPU-only lanes. Multiplier: unlocked versus locked. Release date: the Threadripper was released later than the EPYC, which launched in the latter part of its production cycle. Launch MSRP: $2899 versus $2722. Both share 64 KB L1 cache per core, eight-channel memory buses, ECC memory support, TSMC as foundry, and the Server/Workstation market segment.