AMD EPYC 9115 vs AMD Ryzen 9 7940HX Comparison

The AMD Ryzen 9 7940HX and the AMD EPYC 9115 are both 16-core, 32-thread processors, but they are engineered for radically different environments. The 7940HX is a mobile part for high-end laptops, while the EPYC 9115 is a server chip for data centers. Benchmark data shows a clear split: the mobile chip wins most general and encryption workloads, while the server chip dominates in raw render and physics tests.

Head-to-Head Benchmarks

The most dramatic divergence appears in Cinebench R23. The EPYC 9115 scores 42,003 in multi-core, which is 30% ahead of the Ryzen 9 7940HX's 29,400. This is a massive margin for a processor with the same core and thread count. The single-core gap is even more pronounced: the EPYC 9115 posts 5,929 versus the 7940HX's 1,807, a 69.5% advantage. These results suggest the EPYC's higher base clock of 2.60 GHz and more modern Zen 5 architecture provide a substantial performance ceiling that the mobile part cannot reach.

However, the Ryzen 9 7940HX wins the majority of the head-to-head comparisons, taking 9 of 13 benchmarks. Its most significant victory is in PassMark's data encryption, where it scores 41,974 versus the EPYC's 33,489, a 25.3% lead. The mobile chip also excels in single-threaded PassMark tests, hitting 3,942 compared to the EPYC's 3,360, a 17.3% advantage. This is counterintuitive given the EPYC's Cinebench single-core dominance, but the PassMark suite measures different instruction mixes.

In integer math, the 7940HX scores 202,883 against the EPYC's 181,807, an 11.6% win. Floating-point math is closer, with the 7940HX taking 121,383 versus 113,853, a 6.6% margin. The mobile processor also wins in extended instructions (51,029 vs 45,477, +12.2%), random string sorting (81,775 vs 70,151, +16.6%), and data compression (693,741 vs 600,099, +15.6%).

The EPYC 9115's other wins beyond Cinebench are in PassMark physics (4,188 vs 2,297, a 45.2% lead) and find prime numbers (289 vs 273, +5.5%). The physics result is notable because it suggests the server chip's architecture handles complex floating-point simulations with far greater efficiency, despite losing the general floating-point math test.

Where Each One Wins

The Ryzen 9 7940HX is the clear winner for security and data-centric workloads. Its 25.3% lead in encryption and 15.6% advantage in compression make it a strong choice for tasks involving cryptography, file archiving, and database operations that rely on data transformation. The 11.6% win in integer math also indicates superior performance for general business applications, financial modeling, and any software that heavily uses integer arithmetic. Its 17.3% lead in PassMark single-thread performance suggests better responsiveness for lightly threaded applications like web browsing or office suites, even though the Cinebench data contradicts this.

The EPYC 9115 is the champion for rendering and physics simulation. The 30% lead in Cinebench R23 multi-core is a direct indicator for 3D rendering, video encoding, and other heavily parallelized creative workloads. The 45.2% win in PassMark physics is particularly relevant for scientific computing, engineering simulation, and any workload that uses physics engines. The 69.5% single-core lead in Cinebench R23 is also significant for software that relies on a single powerful core, such as legacy applications or certain CAD tools.

The data also shows a split in memory-heavy scenarios. The EPYC 9115's twelve-channel memory bus and 576.0 GB/s bandwidth dwarf the 7940HX's dual-channel 83.2 GB/s. This is not directly benchmarked here, but it implies the server chip will handle large datasets and memory-intensive virtualization far better. Conversely, the 7940HX's 5.20 GHz boost clock versus the EPYC's 4.10 GHz boost clock likely contributes to its wins in latency-sensitive tasks like encryption.

Architecture Differences

The two processors represent different generations of AMD design. The Ryzen 9 7940HX is built on Zen 4 architecture with the "Dragon Range" codename, while the EPYC 9115 uses the newer Zen 5 architecture with the "Turin" codename. This generational gap is reflected in the manufacturing process: the 7940HX is on TSMC's 5 nm node, while the EPYC 9115 uses the more advanced 4 nm node. The EPYC also packs more transistors at 16,630 million versus 13,140 million, despite having a nearly identical die size (2x 70.6 mm² versus 2x 71 mm²).

Cache configurations differ significantly. The 7940HX has 64 KB of L1 and 1 MB of L2 per core, with 64 MB of shared L3. The EPYC 9115 has a larger L1 at 80 KB per core, but the same 1 MB L2 and 64 MB of shared L3. The larger L1 cache on the EPYC likely contributes to its physics and prime number performance. Both support DDR5 memory, but the EPYC's twelve-channel bus is a fundamental architectural advantage for server workloads, while the 7940HX's dual-channel design is typical for mobile.

Platform features also diverge. The 7940HX uses AMD Socket FL1, has 28 PCIe Gen 5 lanes, includes a Radeon 610M integrated GPU, and supports ECC memory? No, it does not support ECC. The EPYC 9115 uses Socket SP5, has 128 PCIe Gen 5 lanes, no integrated graphics, and does support ECC memory. The EPYC also has an unlocked multiplier? No, it is locked, while the 7940HX is unlocked. The mobile chip has a 55W TDP, while the server part is rated at 125W. The EPYC 9115 has a launch MSRP of $726.

FAQ

Q: Which processor is faster in Cinebench R23 multi-core?

A: The AMD EPYC 9115 is significantly faster, scoring 42,003 compared to the Ryzen 9 7940HX's 29,400, a 30% advantage.

Q: Does the Ryzen 9 7940HX win any benchmark by a large margin?

A: Yes, it wins PassMark data encryption by 25.3% (41,974 vs 33,489) and PassMark single-thread by 17.3% (3,942 vs 3,360).

Q: What is the core and thread count for both processors?

A: Both have 16 cores and 32 threads.

Q: Which processor has a higher boost clock?

A: The Ryzen 9 7940HX has a boost clock of 5.20 GHz, while the EPYC 9115 has a boost clock of 4.10 GHz.

Q: Is memory bandwidth a major difference?

A: Yes, the EPYC 9115 has a twelve-channel memory bus with 576.0 GB/s bandwidth, while the 7940HX has a dual-channel bus with 83.2 GB/s.

Q: Which processor has a more advanced manufacturing process?

A: The EPYC 9115 is built on a 4 nm process, while the Ryzen 9 7940HX is built on a 5 nm process.

The Verdict

The data paints a clear picture of two specialized tools. For mobile workstations and high-performance laptops, the Ryzen 9 7940HX is the better choice. Its wins in 9 out of 13 benchmarks, including encryption, integer math, and data compression, make it a versatile performer for a range of professional applications. The fact that it achieves this with a 55W TDP is remarkable, though the data does not measure power efficiency directly. Its 94th percentile ranking among all CPUs confirms it is a top-tier mobile part.

For server and workstation deployments, the EPYC 9115 is the superior processor. The 30% lead in Cinebench R23 multi-core is the defining metric for rendering and heavy compute. The 45.2% lead in physics is equally decisive for simulation workloads. The twelve-channel memory bandwidth and ECC support are critical features that the 7940HX lacks entirely. The EPYC's 94th percentile ranking matches the mobile chip, but its architecture is built for sustained, memory-hungry server tasks.

The average benchmark scores are nearly identical — 69,875 for the 7940HX versus 69,288 for the EPYC 9115, a difference of less than 1%. This makes the choice entirely dependent on the target platform. The Ryzen 9 7940HX is the right pick for a portable, high-performance laptop. The EPYC 9115 is the right pick for a rack-mounted server or a workstation that demands maximum multi-core throughput and memory capacity. There is no single winner; there is only the correct tool for the job.