AMD EPYC 7642 vs AMD EPYC 9275F Comparison

The AMD EPYC 9275F and the AMD EPYC 7642 represent two distinct eras of server processing, with the former built on the modern Zen 5 architecture and the latter on the older Zen 2 design. The benchmark data reveals a generational chasm in raw performance, yet the older chip retains a niche where its unique characteristics still matter. The average benchmark score for the 9275F stands at 133174, placing it 7.4% ahead of the 7642's 124006 in the overall database hierarchy.

Head-to-Head Benchmarks

The most striking pattern in the head-to-head data is the consistency of the 9275F's victory margin across a wide range of workloads. In all six Cinebench tests—R15, R20, and R23, both multi-core and single-core—the 9275F wins by a uniform delta of 43.9%. This is a sweeping victory that points to a fundamental architectural advantage rather than a workload-specific one. For instance, in the Cinebench R23 multi-core test, the 9275F scores 71927 against the 7642's 49975. In single-core R23, the gap is similar, with 10154 versus 7055. This consistent 43.9% delta across both single-threaded and multi-threaded rendering suggests the newer chip's IPC (instructions per clock) and clock speed advantages translate almost linearly to this workload.

The Passmark suite offers a more nuanced picture. The 9275F dominates in several compute-heavy tasks, but the 7642 secures a significant win in one specific area. The most dramatic difference is in the Passmark physics test, where the 9275F scores 12089, a full 137.1% higher than the 7642's 5098. This is the largest delta in the entire comparison and indicates a massive advantage in simulation and physics-based computation. Following that, the find prime numbers test shows a 99.8% delta, with the 9275F scoring 991 versus 496. This near-doubling of performance in a single-threaded integer workload underscores the per-core strength of the Zen 5 architecture.

Single-thread performance in the Passmark suite continues the theme, with the 9275F scoring 3810, an 85.7% improvement over the 7642's 2052. This is a substantial gap that would be felt in any latency-sensitive application. The extended instructions test also favors the 9275F, with a 37.8% delta (94889 vs 68841), indicating better handling of advanced instruction sets. In floating-point math, the 9275F leads by 11% (201888 vs 181887), and in random string sorting by 25.4% (144037 vs 114871). Even in integer math, where the gap is smaller, the 9275F still wins by 4.1% (317777 vs 305303). Data compression is the closest win for the 9275F, with a mere 1.4% delta (1212560 vs 1195584), suggesting the 7642's higher core count helps keep it competitive in this area.

The sole victory for the AMD EPYC 7642 comes in data encryption, where it scores 86397 compared to the 9275F's 62664, a delta of -27.5% in favor of the older chip. This is a notable reversal, suggesting that the 7642's architecture or its specific instruction set implementation is better suited for this particular cryptographic workload. It is also notably the 7642's benchmark results place it just 0.1% behind the AMD Ryzen Threadripper PRO 5975WX in its own nearest rivals list, showing it remains a relevant performer in its generation.

The Verdict

The data is unambiguous: the AMD EPYC 9275F is the far more powerful processor in almost every measurable way. It wins 16 out of 17 head-to-head benchmarks and delivers a dominant 43.9% lead in the entire Cinebench suite. For any workload that prioritizes raw compute throughput, core speed, or simulation physics, the 9275F is the clear choice. Its 98th percentile ranking among all CPUs, coupled with its average score that is 8% higher than the AMD EPYC 7643P, places it firmly in the top tier of available server processors.

However, the 7642's win in data encryption is not an anomaly to be dismissed. For workloads heavily dependent on encryption and decryption, such as secure database transactions or VPN termination, the data shows the 7642 provides a 27.5% performance advantage. This suggests a specialized use case where the older, higher-core-count chip is the better option. The 7642 also holds its own in the broader market, sitting just 2.2% behind the newer AMD EPYC 9354 in its nearest rivals list, indicating that its Zen 2 architecture is still competitive in specific tasks that scale with core count.

For most general server workloads, the 9275F is the obvious recommendation. The data shows a generation-defining leap in performance. The 7642, while older, is not obsolete; it is a specialist. The choice comes down to whether the workload is dominated by encryption, where the 7642 wins, or by everything else, where the 9275F is overwhelmingly superior.

FAQ

Q: Which processor is faster in multi-core rendering?

A: The AMD EPYC 9275F is significantly faster. In the Cinebench R23 multi-core test, it scored 71927, a 43.9% improvement over the 7642's 49975. This consistent delta is observed across all Cinebench versions.

Q: Does the AMD EPYC 7642 have any benchmark advantage?

A: Yes, it wins the Passmark data encryption test with a score of 86397, which is 27.5% higher than the 9275F's 62664. This is the only benchmark in the comparison where the 7642 comes out ahead.

Q: How does single-threaded performance compare?

A: The 9275F is vastly superior in single-threaded tasks. In the Passmark single-thread test, it scores 3810, an 85.7% improvement over the 7642's 2052. The Cinebench R23 single-core test shows a similar 43.9% delta.

Q: What is the difference in physical simulation performance?

A: The difference is dramatic. In the Passmark physics test, the 9275F scores 12089, which is 137.1% higher than the 7642's 5098. This is the largest performance gap in the entire data set.

Q: Is the 7642 a good processor even if it loses most tests?

A: Yes, its average benchmark score of 124006 places it in the 98th percentile of all CPUs. It is also just 0.1% behind the AMD Ryzen Threadripper PRO 5975WX in its nearest rivals list, showing it remains a strong performer, especially in its specific area of encryption.

Q: How often does each processor win in the head-to-head comparison?

A: The AMD EPYC 9275F wins 16 of the 17 benchmark tests. The AMD EPYC 7642 wins only a single test, which is the Passmark data encryption benchmark.

Specification Differences

The two processors are built on fundamentally different platforms. The AMD EPYC 9275F uses the AMD Socket SP5, while the 7642 uses the older AMD Socket SP3. The 9275F supports DDR5 memory across a twelve-channel bus, providing a memory bandwidth of 576.0 GB/s. In contrast, the 7642 uses DDR4 memory on an eight-channel bus, with a much lower memory bandwidth of 204.8 GB/s. This is a major difference that contributes to the 9275F's performance advantage in memory-intensive tasks. The 9275F also features PCIe Gen 5 with 128 Lanes (CPU only), while the 7642 is equipped with PCIe Gen 4, though the exact lane count is not specified in the data.

The core and thread configuration is another stark difference, with the 9275F having 24 cores and 48 threads, while the 7642 has double the cores and threads at 48 and 96, respectively. The 9275F compensates with much higher clock speeds, with a base clock of 4.10 GHz and a boost clock of 4.80 GHz, compared to the 7642's 2.40 GHz base and 3.40 GHz boost. The thermal design power (TDP) also differs, with the 9275F rated at 320 watts and the 7642 at 225 watts. The 9275F has a launch MSRP of $3439, while no launch MSRP is available for the 7642.

Architecture Differences

The architectural divide between these two chips is generational. The AMD EPYC 9275F is based on the Zen 5 architecture, codenamed "Turin", and is manufactured on a 4 nm process at TSMC. It contains 66,520 million transistors across a die size of 8x 70.6 mm². The 7642, in contrast, uses the Zen 2 architecture, codenamed "Rome", built on a 7 nm process, also at TSMC. Its transistor count is listed as 3,800 million, with a die size of 74 mm². This difference in process node and transistor density is a primary driver of the 9275F's superior performance and efficiency.

The cache hierarchy also differs significantly. The 9275F has an L1 cache of 80 KB per core and an L2 cache of 1 MB per core, while the 7642 has a larger L1 cache of 96 KB per core but a smaller L2 cache of 512 KB per core. Both processors share a 256 MB L3 cache, but the 9275F's larger per-core L2 cache likely contributes to its higher single-threaded performance. The 9275F was released on 2024-10-09, while the 7642 is much older, with a release date of 2019-08-06. The production status for both is listed as "Active".

Where Each One Wins

The AMD EPYC 9275F is the winner in almost every scenario, but the nature of its victories varies. It is the clear choice for any workload that is sensitive to single-threaded performance, as evidenced by an 85.7% lead in Passmark single-thread and a 43.9% lead in Cinebench R23 single-core. Its massive 137.1% lead in the Passmark physics test makes it the go-to option for simulation, scientific computing, and any application with complex physical modeling. Its strong performance in extended instructions (37.8% lead) also makes it suitable for modern, vectorized code. For general multi-threaded throughput, the consistent 43.9% lead in Cinebench multi-core tests shows it handles rendering and video encoding with far greater efficiency, despite having half the cores of the 7642.

The AMD EPYC 7642 has a single, but distinct, area of dominance. Its 27.5% lead in the Passmark data encryption test is its key selling point. For workloads that are heavily encryption-bound, such as secure web servers, VPN gateways, or cryptographic key management, the data indicates the 7642 is the better performer. Its higher core count of 48 may also provide advantages in highly parallel, non-cache-dependent workloads that can fully utilize all threads, even if the per-core performance is lower. The data compression test, where the 9275F only wins by 1.4%, hints that the 7642's core count can nearly match the newer chip in this area. Ultimately, the 7642 is a specialist for encryption-focused tasks, while the 9275F is the general-purpose champion.