AMD EPYC 7742 vs AMD EPYC 7H12 Comparison

Both processors are 64-core, 128-thread Zen 2 parts on the same 7 nm TSMC process, yet the benchmark data reveals a consistent, if narrow, performance edge for the AMD EPYC 7H12. Across all six Cinebench tests, the 7H12 wins by a uniform 0.7% margin, while the EPYC 7742 never takes a single head-to-head victory. The average benchmark scores reflect this parity: the 7H12 posts an average of 17120 compared to the 7742’s 16998, a difference of 122 points that places both chips within a hair of each other in the global percentile rankings (71st vs. 70th). The story here is not about dominance but about consistent, incremental gains that may matter more in specific workloads than in general-purpose computing.

Head-to-Head Benchmarks

The data tells a remarkably uniform story. In Cinebench R15 multi-core, the 7H12 scores 5965 against the 7742’s 5923, a 0.7% advantage. The single-core R15 test shows the same 0.7% delta, with 842 versus 836. Moving to R20, the multi-core result is 24858 for the 7H12 and 24682 for the 7742 — again 0.7%. The R20 single-core test repeats the pattern: 3509 versus 3484. In R23, the gap persists at 0.7% in both multi-core (59188 vs. 58769) and single-core (8355 vs. 8296). Every single test, across three generations of Cinebench, yields the exact same relative difference.

This consistency is notable. It suggests the 7H12’s advantage is structural, not workload-dependent. The 7742 has a higher boost clock of 3.40 GHz versus 3.30 GHz on the 7H12, yet the 7H12 still wins every test. The 7H12 counters with a higher base clock of 2.60 GHz versus 2.25 GHz, which likely explains the edge in sustained workloads. The delta is small — 0.7% translates to roughly 42 points in R15 multi-core and 419 points in R23 multi-core — but it is perfectly repeatable across all six benchmarks. Neither chip dips below its rival in any single metric, which means the 7H12 offers a modest but guaranteed uplift.

Where Each One Wins

The 7H12 wins everywhere, but the magnitude of its wins is what defines the use-case split. In multi-threaded rendering, the R23 multi-core score of 59188 versus 58769 gives the 7H12 a 419-point lead. That is enough to shave seconds off long render times, though not enough to change the fundamental performance class. Similarly, in R15 multi-core, the 42-point lead (5965 vs. 5923) is negligible for a single render but could accumulate across thousands of frames. For single-threaded tasks, the 7H12’s lead in R23 single-core (8355 vs. 8296) is 59 points, which is a 0.7% improvement in tasks like spreadsheet recalculation or light scripting.

The 7742’s only consolation is its lower TDP of 225 watts versus 280 watts. That makes it the more power-efficient choice for dense server deployments where thermal headroom is tight. However, the data shows no benchmark where the 7742 wins, so any power savings come at the cost of raw performance. For workloads that are fully parallel and can saturate all 64 cores, the 7H12’s higher base clock is the deciding factor. For bursty, short-duration tasks, the 7742’s higher boost clock might theoretically help, but the benchmark results do not support that hypothesis — the 7H12 wins single-core tests too, despite the 7742’s 100 MHz boost advantage.

Architecture Differences

Both chips are built on the Zen 2 architecture with the Rome codename, fabricated on a 7 nm process at TSMC. They share identical core counts (64 cores, 128 threads), cache hierarchies (96 KB L1 per core, 512 KB L2 per core, 256 MB shared L3), and memory subsystems (eight-channel DDR4 with 204.8 GB/s bandwidth, ECC support, PCIe Gen 4). The transistor count is identical at 3,800 million, and the die size is the same 74 mm². Both use the AMD Socket SP3 and are classified as Server/Workstation parts with active production status.

The differences are subtle but meaningful. The 7H12 has a base clock of 2.60 GHz, which is 350 MHz higher than the 7742’s 2.25 GHz. Its boost clock is 3.30 GHz, which is 100 MHz lower than the 7742’s 3.40 GHz. The TDP tells the rest of the story: the 7H12 is rated at 280 watts, a 55-watt increase over the 7742’s 225 watts. This suggests the 7H12 is a higher-binned part, designed to sustain higher clocks under load at the cost of additional power draw. The release dates differ by about six weeks — the 7742 launched on 2019-08-06, while the 7H12 followed on 2019-09-17. Both share the same part number prefix (100-000000053 for the 7742, 100-000000055 for the 7H12), indicating they are close siblings in the same product family.

The Verdict

The data is unambiguous: the AMD EPYC 7H12 wins all six head-to-head benchmarks by a uniform 0.7% margin. If raw performance is the sole criterion, the 7H12 is the better choice. Its higher base clock of 2.60 GHz versus 2.25 GHz delivers a consistent edge in both multi-core and single-core workloads, as evidenced by the identical deltaPct across every Cinebench test. The 7H12’s average benchmark score of 17120 also edges out the 7742’s 16998, and its 71st percentile ranking versus 70th reinforces the pattern.

However, the 7742 is not without merit. Its TDP of 225 watts versus 280 watts makes it significantly easier to cool and power in a dense server environment. For a workload that is latency-bound rather than throughput-bound, the 7742’s higher boost clock of 3.40 GHz could theoretically offer an advantage, but the single-core benchmarks do not bear this out — the 7H12 wins those too. The 7742 is the choice for power-constrained deployments where a 55-watt savings matters more than a 0.7% performance gain. The 7H12 is the choice for anyone who wants the absolute fastest performance from this generation, regardless of power budget. Both chips are otherwise architecturally identical, so the decision comes down to clock speed versus power draw.

FAQ

Q: How much faster is the AMD EPYC 7H12 than the AMD EPYC 7742 in multi-core workloads?

A: The 7H12 wins by 0.7% in every multi-core benchmark. In Cinebench R23 multi-core, that translates to a score of 59188 versus 58769, a difference of 419 points.

Q: Does the AMD EPYC 7742 win any benchmark?

A: No. The head-to-head data shows the 7H12 winning all six tests, with the 7742 recording zero wins across Cinebench R15, R20, and R23 in both single-core and multi-core modes.

Q: Why does the 7H12 win single-core tests despite having a lower boost clock?

A: The 7H12 has a base clock of 2.60 GHz versus 2.25 GHz on the 7742. Although the 7742 boosts to 3.40 GHz versus 3.30 GHz, the benchmark results show the 7H12 still wins single-core tests by 0.7%, suggesting the higher base clock is more influential in these workloads.

Q: What is the TDP difference between the two processors?

A: The 7H12 is rated at 280 watts, while the 7742 is rated at 225 watts. This 55-watt difference is the most significant non-performance specification separating the two.

Q: Are the cache sizes identical?

A: Yes. Both processors feature 96 KB of L1 cache per core, 512 KB of L2 per core, and 256 MB of shared L3 cache. They also share the same eight-channel DDR4 memory bus with 204.8 GB/s bandwidth.

Q: How do they compare to other CPUs in the database?

A: The 7H12 has an average benchmark score of 17120, placing it 0.3% above the Intel Core Ultra 7 164U and AMD EPYC 7573X. The 7742’s average score of 16998 puts it 0.1% below the Intel Core i7-1260P and 0.2% below the AMD Ryzen 5 3600.

Specification Differences

The two processors differ in exactly four specification fields: base clock, boost clock, TDP, and release date. The base clock is 2.60 GHz on the 7H12 versus 2.25 GHz on the 7742, a 350 MHz advantage for the 7H12. The boost clock inverts this relationship: 3.30 GHz on the 7H12 versus 3.40 GHz on the 7742, a 100 MHz advantage for the 7742. The TDP is 280 watts for the 7H12 and 225 watts for the 7742, a 55-watt difference. The release date is 2019-09-17 for the 7H12 and 2019-08-06 for the 7742, about six weeks apart. All other specifications — cores, threads, cache, memory support, PCIe generation, socket, process node, transistor count, die size, and ECC support — are identical between the two parts.