AMD EPYC 7343 vs AMD EPYC 9124 Comparison

The AMD EPYC 9124 and AMD EPYC 7343 are two 16-core server processors that deliver nearly identical average performance, but they achieve it through fundamentally different design philosophies. The EPYC 9124, built on the newer Zen 4 architecture, wins the majority of benchmark comparisons (11 out of 17), yet the older Zen 3-based EPYC 7343 counters with decisive victories in specific workloads. The data shows a clear split: the 9124 excels in modern instruction-heavy and memory-bandwidth-sensitive tasks, while the 7343 retains an edge in integer-heavy and physics-based calculations. This is not a case of one chip being obsolete; it is a matter of matching silicon to workload.

Where Each One Wins

The EPYC 9124 is the broad-spectrum winner, taking the lead in 11 of the 17 head-to-head benchmarks. Its most dominant victories come in PassMark extended instructions, where it scores 43,380 versus 35,626 for the 7343 — a commanding 21.8% advantage. This points to a significant superiority in executing newer, complex instruction sets, a direct benefit of the Zen 4 architecture. The 9124 also shows a strong 9.8% lead in random string sorting (74,177 vs 67,576), indicating better handling of memory-intensive, pointer-chasing workloads. In all six Cinebench tests (R15, R20, R23, both single and multi-core), the 9124 wins by a consistent margin of 0.5% to 0.6%, proving a slight but uniform advantage in both single-threaded and multi-threaded rendering tasks. It also edges out the 7343 in data compression (599,417 vs 589,770, a 1.6% gain), floating point math (87,057 vs 86,311, a 0.9% gain), and multithread performance (43,846 vs 43,644, a 0.5% gain).

The EPYC 7343 is the specialist, winning 6 benchmarks, and its victories are not marginal. The largest is in PassMark find prime numbers, where it scores 382 against the 9124's 256 — a massive 33% advantage. This suggests a significant edge in pure integer arithmetic loops that do not benefit from larger caches or newer instruction sets. It also delivers a 23.3% lead in physics (4,774 vs 3,662), a workload that often relies on strong per-core integer throughput and predictable memory access. The 7343 wins integer math by 4.6% (156,033 vs 148,785) and data encryption by 3.7% (37,454 vs 36,078), further cementing its strength in integer-heavy operations. Finally, it holds a slim 0.8% lead in both PassMark single-thread and singlethread scores (2,740 vs 2,719), indicating a slightly faster base clock of 3.20 GHz directly translates to a tiny single-core advantage.

Architecture Differences

The fundamental divergence lies in the processor generation. The EPYC 9124 is from the EPYC 9004 series (Zen 4, codename Genoa), while the EPYC 7343 belongs to the EPYC 7003 series (Zen 3, codename Milan). This generational leap brings the 9124 to a 5 nm process node from TSMC, compared to the 7343's 7 nm node. The 9124 packs transistors more densely, featuring 26,280 million transistors across a 4x 72 mm² die configuration, whereas the 7343 uses 16,600 million transistors on a 4x 81 mm² configuration.

Cache hierarchies differ significantly. Both have 64 KB of L1 per core, but the L2 cache is doubled on the 9124 (1 MB per core vs 512 KB per core). However, the L3 cache is halved: the 9124 has 64 MB shared, while the 7343 boasts 128 MB shared. This is a critical trade-off. The 7343's larger L3 cache likely explains its dominance in the prime number test, which can benefit from fitting larger data sets in cache. The 9124 compensates with faster memory and more lanes. It supports DDR5 memory over a Twelve-channel bus, yielding a theoretical bandwidth of 460.8 GB/s — more than double the 7343's DDR4, Eight-channel, 204.8 GB/s configuration. The 9124 also upgrades to PCIe Gen 5 with 128 lanes, while the 7343 is limited to PCIe Gen 4 with 128 lanes. Both support ECC memory, but the 9124 requires the newer AMD Socket SP5, while the 7343 uses the older AMD Socket SP3. The 9124's launch MSRP is $1083, while the 7343's launch MSRP is $1565.

Head-to-Head Benchmarks

The most striking result is the 21.8% gap in extended instructions. The 9124's score of 43,380 dwarfs the 7343's 35,626, representing the largest percentage win for the newer chip. This is a clear signpost for workloads that use AVX-512 or similar modern instruction sets, which are native to Zen 4. In contrast, the 7343's 33% victory in find prime numbers (382 vs 256) is the largest margin in the entire comparison, showcasing the older chip's raw integer loop capability. The physics test also shows a substantial 23.3% gap (4,774 vs 3,662) in favor of the 7343, a significant anomaly in an otherwise close contest.

The Cinebench tests are notably tight. Across all six, the 9124 wins by exactly 0.5% or 0.6%. For example, in R23 multi-core, the 9124 scores 37,269 versus 37,097, and in R23 single-core, 5,261 versus 5,237. These are negligible real-world differences, indicating that both chips are well-matched for rendering workloads. The PassMark multithread test echoes this, with the 9124 winning by a slim 0.5% (43,846 vs 43,644).

Memory-dependent tasks show a clearer split. In random string sorting, the 9124's higher bandwidth and newer memory controller yield a 9.8% win (74,177 vs 67,576). The data compression test also favors the 9124 by 1.6% (599,417 vs 589,770), likely due to its faster memory subsystem. Conversely, the data encryption test favors the 7343 by 3.7% (37,454 vs 36,078), and integer math goes to the 7343 by 4.6% (156,033 vs 148,785). Interestingly, in floating point math, the 9124 wins by a modest 0.9% (87,057 vs 86,311), suggesting that the 7343's architecture is still competitive in FPU-heavy tasks despite its older design.

The Verdict

Choose the AMD EPYC 9124 for modern, bandwidth-hungry server workloads. The data is unambiguous: it wins the majority of benchmarks, including all rendering tests, and its 21.8% lead in extended instructions makes it the superior choice for scientific computing, cryptography, and any application that leverages modern SIMD instruction sets. Its support for DDR5 and PCIe Gen 5, while not directly benchmarked, is reflected in its higher memory bandwidth of 460.8 GB/s, which explains its wins in data compression and string sorting. This is the forward-looking platform.

Choose the AMD EPYC 7343 for specific, integer-heavy or legacy workloads. Its 33% win in prime number finding and 23.3% win in physics are too large to ignore. If your application is dominated by integer math loops, this chip will outperform the newer 9124. Its larger 128 MB L3 cache is likely the key differentiator, allowing it to keep more data on-die. The 7343 also offers a slight single-thread advantage (0.8%) and a higher base clock of 3.20 GHz, which may matter for lightly-threaded, latency-sensitive tasks. It remains a viable, active production part.

The average benchmark scores confirm the overall parity: the 9124 averages 65,104, while the 7343 averages 64,202, a difference of less than 1.5%. Both hold a 93rd percentile ranking among all CPUs. The decision is not about which is faster, but which is faster for your specific code.

FAQ

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

A: The AMD EPYC 9124 is faster, scoring 37,269 compared to the EPYC 7343's 37,097, a difference of 0.5%.

Q: Why does the AMD EPYC 7343 win the "find prime numbers" test by such a large margin?

A: The EPYC 7343 scores 382 versus the EPYC 9124's 256, a 33% advantage. This is likely due to its larger 128 MB shared L3 cache, which can hold more working data for integer loops compared to the 9124's 64 MB.

Q: Which CPU has better memory bandwidth?

A: The AMD EPYC 9124 has significantly higher theoretical memory bandwidth at 460.8 GB/s, using twelve-channel DDR5 memory, compared to the EPYC 7343's 204.8 GB/s over eight-channel DDR4.

Q: What is the biggest single benchmark win for the AMD EPYC 9124?

A: The EPYC 9124 wins the PassMark extended instructions test with a score of 43,380 versus 35,626 for the EPYC 7343, a 21.8% advantage.

Q: Are these CPUs comparable in overall performance?

A: Yes. The EPYC 9124 has an average benchmark score of 65,104, while the EPYC 7343 averages 64,202. Both sit at the 93rd percentile of all CPUs, indicating they are tightly matched in aggregate.

Q: Which socket does each processor use?

A: The AMD EPYC 9124 uses the newer AMD Socket SP5, while the AMD EPYC 7343 uses the older AMD Socket SP3.

Specification Differences

| Specification | AMD EPYC 9124 | AMD EPYC 7343 |

| :--- | :--- | :--- |

| Architecture | Zen 4 | Zen 3 |

| Codename | Genoa | Milan |

| Process Node | 5 nm | 7 nm |

| Transistors | 26,280 million | 16,600 million |

| Die Size | 4x 72 mm² | 4x 81 mm² |

| Base Clock | 3.00 GHz | 3.20 GHz |

| Boost Clock | 3.70 GHz | 3.90 GHz |

| TDP | 200 W | 190 W |

| L2 Cache | 1 MB (per core) | 512 KB (per core) |

| L3 Cache | 64 MB (shared) | 128 MB (shared) |

| Memory Support | DDR5 | DDR4 |

| Memory Bus | Twelve-channel | Eight-channel |

| Memory Bandwidth | 460.8 GB/s | 204.8 GB/s |

| PCIe | Gen 5, 128 Lanes (CPU only) | Gen 4, 128 Lanes (CPU only) |

| Socket | AMD Socket SP5 | AMD Socket SP3 |

| Launch MSRP | $1083 | $1565 |

| Part Number | 100-100000802 | 100-000000338100-100000338WOF |