Intel Core i9-10920X vs Intel Core i9-7940X Comparison

The Intel Core i9-10920X and Intel Core i9-7940X are both high-end desktop processors built for the Intel Socket 2066 platform, but they represent different generations of Intel's X-Series lineup. The data shows a consistent, though often narrow, performance advantage for the newer 10th Gen part across every benchmark recorded, with the largest gaps appearing in Geekbench tests. This analysis walks through the head-to-head results, architectural differences, and the specific workloads where each processor holds an edge.

Head-to-Head Benchmarks

The benchmark results are unambiguous in direction: the Intel Core i9-10920X wins all eight head-to-head comparisons recorded in the data. However, the magnitude of those wins varies significantly depending on the test suite. In the Cinebench R15, R20, and R23 tests, the 10920X’s victories are consistent but narrow, with delta percentages hovering between 1.9% and 2%. For instance, in Cinebench R15 multicore, the 10920X scores 2203 against the 7940X’s 2161, a 1.9% margin. The single-core results follow the same pattern: 311 versus 305 in R15 single-core (a 2% delta) and 3086 versus 3027 in R23 single-core (a 1.9% delta). These are tight margins, suggesting that in raw rendering workloads, the two processors are closely matched, with the newer chip holding a slight but repeatable edge.

The picture changes dramatically when examining Geekbench results. In Geekbench multicore, the 10920X scores 11165 against the 7940X’s 10516, a 6.2% advantage. The single-core Geekbench gap is even more pronounced: 1673 versus 1445, representing a 15.8% delta. This is the single largest performance difference in the entire head-to-head dataset. The data suggests that the 10920X’s architectural improvements translate into substantially better performance in workloads measured by Geekbench, particularly in single-threaded scenarios, while the Cinebench tests show that both chips are capable of delivering similar throughput in heavily multi-threaded rendering tasks.

Looking at the broader context, the 10920X’s average benchmark score is 6347, placing it at the 62nd percentile of all CPUs, while the 7940X averages 6147, sitting at the 61st percentile. The nearest rival for the 10920X is the AMD EPYC 7551, which scores 6391 on average, just 0.7% higher, and the AMD Ryzen Threadripper 1950X at 6231, which the 10920X beats by 1.9%. For the 7940X, the closest competitor is the AMD EPYC 7272 at 6186, which edges it out by 0.6%, while the 7940X beats the AMD Ryzen 3 3100U by 1.6%. These figures indicate that while the two Intel parts are close to each other, they also occupy a similar competitive tier against AMD offerings, with the 10920X generally having a slight edge over its older counterpart.

Architecture Differences

The two processors share several fundamental specifications, but their underlying architectures differ by generation. The 10920X is built on Cascade Lake, specifically the Cascade Lake-X variant, and belongs to the Core i9 X-Series 10th Gen family. The 7940X uses the older Skylake architecture, codenamed Skylake-X, and is part of the 7th Gen X-Series. Both are manufactured on Intel’s 14 nm process node, so the manufacturing technology is identical, but the microarchitecture improvements in Cascade Lake account for the performance differences observed.

Core and thread counts differ in an interesting way. The 7940X has 14 cores and 28 threads, while the 10920X has 12 cores and 24 threads. This means the older chip has two more physical cores and four more threads available for parallel workloads. Despite this deficit, the 10920X still wins all multicore benchmarks, indicating that its per-core efficiency and higher clocks are sufficient to overcome the raw core-count disadvantage. The 10920X also has a higher boost clock of 4.80 GHz compared to the 7940X’s 4.40 GHz, and a higher base clock of 3.50 GHz versus 3.10 GHz. Both chips share the same cache layout: 64 KB of L1 per core, 1 MB of L2 per core, and 19.25 MB of shared L3 cache. The die size differs, with the 7940X listed at 484 mm², while the 10920X does not have a die size recorded in the data.

Both processors support DDR4 memory via a quad-channel memory bus, and neither supports ECC memory. The 7940X has a recorded memory bandwidth of 85.3 GB/s, while the 10920X does not have a bandwidth figure listed. PCIe support is Gen 3 for both, but the 7940X explicitly lists 44 lanes (CPU only), while the 10920X is simply listed as Gen 3 without a lane count. Both have unlocked multipliers for overclocking, and neither includes integrated graphics. The production statuses differ: the 10920X is listed as Active, while the 7940X is End-of-life.

The Verdict

Based strictly on the benchmark data, the Intel Core i9-10920X is the superior processor in every measured test. It wins all eight head-to-head comparisons, with margins ranging from a narrow 1.9% in Cinebench multicore tests to a substantial 15.8% in Geekbench single-core. Its average benchmark score of 6347 exceeds the 7940X’s 6147 by 200 points, and it holds a higher percentile ranking at 62 versus 61. The 10920X achieves these results despite having two fewer cores and four fewer threads than the 7940X, which underscores the efficiency gains from the newer Cascade Lake architecture and the higher clock speeds.

The 7940X is not without merit. Its 14 cores and 28 threads provide a theoretical advantage in heavily parallel workloads, and its performance in Cinebench multicore tests is close to the 10920X, with deltas under 2%. However, the data shows that the 10920X still outperforms it in those same tests, meaning the core-count advantage does not translate into a win. The 7940X’s production status is end-of-life, while the 10920X is active, which may be relevant for availability, but the benchmark data alone points clearly to the 10920X as the stronger choice.

Specification Differences

The following table highlights the fields where the two processors differ according to the data:

| Specification | Intel Core i9-10920X | Intel Core i9-7940X |

|---|---|---|

| Cores | 12 | 14 |

| Threads | 24 | 28 |

| Base Clock | 3.50 GHz | 3.10 GHz |

| Boost Clock | 4.80 GHz | 4.40 GHz |

| Architecture | Cascade Lake | Skylake |

| Codename | Cascade Lake-X | Skylake-X |

| Generation | Core i9 (X-Series 10th Gen) | Core i9 (X-Series 7th Gen) |

| Die Size | Not listed | 484 mm² |

| Memory Bandwidth | Not listed | 85.3 GB/s |

| PCIe | Gen 3 | Gen 3, 44 Lanes (CPU only) |

| Production Status | Active | End-of-life |

| Release Date | 2019-10-18 | 2017-08-31 |

| Launch MSRP | Not listed | $1399 |

| Part Number | Not listed | SR3RQ |

| Average Benchmark Score | 6347 | 6147 |

| Percentile vs All CPUs | 62 | 61 |

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core i9-7940X has 14 cores and 28 threads, while the Intel Core i9-10920X has 12 cores and 24 threads.

Q: Does the 10920X win all benchmark comparisons?

A: Yes, the head-to-head data shows the 10920X wins all 8 benchmarks, with the largest margin being a 15.8% advantage in Geekbench single-core.

Q: What is the clock speed difference between the two?

A: The 10920X has a base clock of 3.50 GHz and a boost clock of 4.80 GHz, while the 7940X has a base clock of 3.10 GHz and a boost clock of 4.40 GHz.

Q: Are both processors on the same manufacturing process?

A: Yes, both are manufactured on Intel’s 14 nm process node.

Q: Which processor has a higher average benchmark score?

A: The 10920X has an average benchmark score of 6347, compared to the 7940X’s 6147.

Q: What is the production status of each processor?

A: The 10920X is listed as Active, while the 7940X is listed as End-of-life.

Where Each One Wins

The Intel Core i9-10920X wins in every benchmark category recorded, so its strengths are broad. However, the size of its wins varies, which points to specific use cases. In Cinebench R15, R20, and R23 multicore tests, the 10920X wins by margins of 1.9% in each case. This indicates that in heavily threaded rendering workloads, such as 3D rendering or video encoding that scale well across cores, the 10920X is only slightly ahead despite having two fewer cores. The 7940X’s extra two cores keep it competitive in these scenarios, making it a viable option for pure multi-threaded throughput where the 1.9% delta is unlikely to be noticeable in real-world use.

The 10920X’s dominance is most pronounced in Geekbench tests. The 6.2% multicore win and the 15.8% single-core win suggest that the newer architecture delivers significant improvements in latency-sensitive and lightly threaded workloads. This makes the 10920X the clear choice for applications like daily desktop use, office productivity, web browsing, and single-threaded software development tasks where the 7940X falls noticeably behind. For users who prioritize single-thread performance or run a mix of light and heavy workloads, the 10920X’s advantages are substantial.

For the 7940X, the data shows no benchmark wins, but its core-count advantage could still make it appealing in hypothetical scenarios where additional physical cores are beneficial. The data does not include a test that specifically rewards the 7940X’s extra cores, so any such advantage is not demonstrated. Given that the 10920X wins even in multicore tests, the 7940X’s best case is to match the 10920X in rendering workloads, falling short by less than 2%. In all other measured areas, the 10920X is ahead, and in Geekbench single-core, it is ahead by a wide margin. The data clearly favors the 10920X for virtually all use cases, with the 7940X only remaining competitive in heavily parallel rendering tasks where the performance difference is minimal.