Intel Core i9-10940X vs Intel Core i9-7940X Comparison

Head-to-Head Benchmarks

The benchmark comparison between the Intel Core i9-7940X and the Intel Core i9-10940X reveals a decisive pattern, with the newer 10th generation part winning seven of the eight recorded tests. The only exception comes in Geekbench multicore, where the i9-7940X posts a narrow 0.5% advantage. That singular win, however, does little to offset the consistent and often identical margins seen across the Cinebench suite.

Looking at the Cinebench R15 results, the i9-10940X scores 2370 in the multicore test against 2161 for the i9-7940X, which translates to an 8.8% deficit for the older chip. The single-core R15 result follows the same trajectory: 334 versus 305, again an 8.7% gap. These are not isolated outliers. The Cinebench R20 test shows the i9-10940X at 9878 multicore and 1394 single-core, while the i9-7940X manages 9006 and 1271 respectively. The delta in both cases is exactly 8.8%. The pattern holds in Cinebench R23, where the i9-10940X reaches 23520 multicore and 3320 single-core, and the i9-7940X trails at 21444 and 3027, with the same 8.8% margin in both metrics.

The consistency of that 8.8% figure across every Cinebench generation is striking. It suggests the performance difference is structural rather than workload-specific, rooted in the architectural and clock-speed changes between the two parts rather than in any particular rendering task. The i9-10940X carries a base clock of 3.30 GHz and a boost of 4.80 GHz, while the i9-7940X operates at 3.10 GHz base and 4.40 GHz boost. That frequency advantage appears to translate directly into the benchmark results, producing the same proportional lead regardless of the Cinebench version.

Geekbench tells a slightly different story. In the multicore test, the i9-7940X actually wins with 10516 versus 10464 for the i9-10940X, a margin of 0.5%. This is a curious reversal given the Cinebench results, and it hints at differences in how the two benchmark suites allocate threads or handle memory access. The single-core Geekbench test, however, aligns with the overall trend: the i9-10940X scores 1556 against 1445, a 7.1% advantage.

The average benchmark score in the database reinforces the broader picture. The i9-10940X averages 6605, while the i9-7940X averages 6147, a difference of roughly 458 points. The newer chip also sits at the 62nd percentile of all CPUs, one point above the i9-7940X at the 61st percentile. These are modest overall rankings, but the head-to-head deltas are unambiguous: the i9-10940X is faster in nearly every recorded workload.

The Verdict

The recorded data points to a clear preference for the Intel Core i9-10940X in almost all scenarios. It wins seven of the eight benchmark tests, with margins ranging from 7.1% to 8.8% in single-core and multicore workloads alike. The only test where the i9-7940X comes out ahead is Geekbench multicore, and even there the advantage is a slim 0.5%, which falls well within typical run-to-run variation for such workloads.

For users whose primary concern is rendering performance, whether in Cinebench R15, R20, or R23, the i9-10940X is the only sensible choice based on the numbers. The consistent 8.8% lead across all three Cinebench versions indicates that the newer architecture delivers a uniform improvement that does not fade under sustained multicore load. The i9-7940X, by contrast, offers no meaningful counterargument from the benchmark data, its sole Geekbench multicore win being too small to influence a purchasing decision.

The i9-7940X should only be considered by users who specifically care about the Geekbench multicore metric and are willing to sacrifice roughly 8% performance everywhere else. That is a difficult trade to justify from the data. The i9-10940X also posts a higher average benchmark score, a higher percentile ranking, and a more recent release date, all of which point in the same direction. If the choice is between these two processors, the i9-10940X is the stronger pick in nearly every measurable way.

Architecture Differences

The two processors share a surprising number of architectural fundamentals. Both are built on Intel's 14 nm process node, both use the Intel Socket 2066 platform, and both feature 14 cores with 28 threads. The cache hierarchy is identical as well: 64 KB of L1 cache per core, 1 MB of L2 cache per core, and 19.25 MB of shared L3 cache. Neither chip includes integrated graphics, and both support DDR4 memory in a quad-channel configuration.

The key architectural difference lies in the core design. The i9-7940X uses the Skylake architecture, specifically the Skylake-X variant, and belongs to the Core i9 X-Series 7th Generation. The i9-10940X uses the Cascade Lake architecture, the Cascade Lake-X variant, and belongs to the Core i9 X-Series 10th Generation. This generational leap is the primary driver of the performance differences observed in the benchmarks.

The shift from Skylake to Cascade Lake brings with it the higher clock speeds seen in the i9-10940X. The newer chip boosts to 4.80 GHz compared to 4.40 GHz for the older part, a difference that explains much of the consistent 8.8% lead in Cinebench tests. The base clocks also differ, with the i9-10940X running at 3.30 GHz versus 3.10 GHz for the i9-7940X. Both processors have unlocked multipliers, allowing overclocking, but the stock frequency advantage still favors the newer part.

The die size for the i9-7940X is recorded at 484 mm², while the i9-10940X has no die size listed in the database. This omission makes a direct comparison of physical silicon characteristics impossible, but the identical process node and cache structure suggest the two chips are closely related at the die level. The production status also differs: the i9-7940X is marked as end-of-life, while the i9-10940X is listed as active. That distinction matters for availability, though it does not directly affect performance.

Specification Differences

The specifications where the two processors differ are relatively few, but each difference carries measurable weight. The architecture is the most fundamental distinction: Skylake-X for the i9-7940X versus Cascade Lake-X for the i9-10940X. This corresponds to a generational difference, with the i9-7940X in the Core i9 X-Series 7th Generation and the i9-10940X in the Core i9 X-Series 10th Generation.

Clock speeds are the second major difference. The i9-7940X has a base clock of 3.10 GHz and a boost clock of 4.40 GHz. The i9-10940X raises both figures to 3.30 GHz base and 4.80 GHz boost. These are the most likely explanations for the benchmark gap, since the core counts, thread counts, and cache sizes are all identical between the two processors.

The memory bandwidth is listed only for the i9-7940X at 85.3 GB/s, while the i9-10940X has no recorded value. This absence makes it impossible to determine whether the newer chip offers a bandwidth improvement. The PCIe configuration also differs in the database: the i9-7940X is listed as Gen 3 with 44 lanes (CPU only), while the i9-10940X is listed simply as Gen 3 without a lane count. That missing detail prevents a full comparison of expansion capabilities.

The release dates are distinct, with the i9-7940X launching in August 2017 and the i9-10940X arriving in October 2019. The launch MSRP for the i9-7940X was $1399, while no MSRP is recorded for the i9-10940X. The i9-7940X carries the part number SR3RQ, while the i9-10940X has no part number listed. Production status differs as well, with the i9-7940X marked end-of-life and the i9-10940X active.

FAQ

Q: Which processor has the higher Cinebench R23 multicore score?

A: The Intel Core i9-10940X scores 23520 in Cinebench R23 multicore, while the Intel Core i9-7940X scores 21444. This gives the i9-10940X an 8.8% lead.

Q: Is there any benchmark where the i9-7940X beats the i9-10940X?

A: Yes, the Geekbench multicore test. The i9-7940X scores 10516 against 10464 for the i9-10940X, a 0.5% advantage for the older chip.

Q: Do the two processors have the same core and thread counts?

A: Yes. Both the Intel Core i9-7940X and the Intel Core i9-10940X have 14 cores and 28 threads, with identical L1, L2, and L3 cache configurations.

Q: What is the boost clock difference between the two chips?

A: The i9-10940X boosts to 4.80 GHz, while the i9-7940X boosts to 4.40 GHz. The base clocks are 3.30 GHz for the i9-10940X and 3.10 GHz for the i9-7940X.

Q: Are both processors built on the same process node?

A: Yes, both use Intel's 14 nm process node and fit the Intel Socket 2066 platform. The architectures differ, with the i9-7940X using Skylake-X and the i9-10940X using Cascade Lake-X.

Q: Which processor has the higher average benchmark score?

A: The i9-10940X averages 6605 across all recorded benchmarks, while the i9-7940X averages 6147. The i9-10940X also sits at the 62nd percentile of all CPUs, compared to the 61st percentile for the i9-7940X.

Where Each One Wins

The Intel Core i9-10940X dominates the benchmark landscape in this comparison. Its wins span every Cinebench test in the database, from R15 to R23, in both single-core and multicore variants. The margins are consistent at 8.8% for all multicore tests and range from 8.7% to 8.8% for single-core tests. This makes the i9-10940X the clear choice for rendering workloads, video encoding, and any application that relies on sustained multicore performance. Its higher base and boost clocks, 3.30 GHz and 4.80 GHz respectively, provide the foundation for these results.

The i9-10940X also wins the Geekbench single-core test with a score of 1556 against 1445 for the i9-7940X, a 7.1% advantage. This suggests it is also the better option for lightly threaded applications such as legacy software, certain productivity tools, and tasks that depend on a single fast core. The average benchmark score of 6605, compared to 6147 for the older chip, reinforces the overall superiority of the i9-10940X across the full range of recorded tests.

The Intel Core i9-7940X has exactly one winning scenario: Geekbench multicore, where it scores 10516 against 10464 for the i9-10940X. The 0.5% margin is the smallest of any benchmark in the comparison, and it stands alone against seven losses. For users whose workflow relies overwhelmingly on the Geekbench multicore metric, the i9-7940X offers a marginal edge, but it comes at the cost of significant deficits in every Cinebench test and in Geekbench single-core performance.

The i9-7940X also carries the distinction of being the only one of the two with a recorded memory bandwidth figure of 85.3 GB/s, though the i9-10940X has no corresponding value in the database to compare against. Both processors share the same core count, thread count, cache sizes, process node, and socket, so the practical differences come down to clock speeds and architecture. The data does not support any scenario where the i9-7940X is the superior overall choice, apart from that single Geekbench multicore result.