Intel Core i7-12800HE vs Intel Core i9-9940X Comparison

Head-to-Head Benchmarks

The recorded data shows a clean sweep for the Intel Core i9-9940X across every benchmark in the comparison. The i9-9940X wins all six head-to-head tests, with the i7-12800HE failing to secure a single victory. The margin is consistent, which points to a systemic advantage rather than workload-specific behavior.

In Cinebench R15 multi-core, the i9-9940X scores 2400 against 2253 for the i7-12800HE, a 6.5% lead. The single-core result in the same test is 338 versus 318, a 6.3% edge. Moving to Cinebench R20, the multi-core gap is again 6.5%, with scores of 10000 and 9391. The single-core delta in R20 is 6.5% as well, 1411 versus 1325.

Cinebench R23 shows the same pattern. The multi-core score for the i9-9940X is 23810, while the i7-12800HE manages 22360, a 6.5% difference. In single-core, the i9-9940X posts 3361 against 3156, another 6.5% margin. The consistency of the 6.5% delta across most tests suggests the performance gap is structural, tied to core count and clock behavior, not to a specific rendering workload.

The i9-9940X also appears in Geekbench, where it records a multi-core score of 10466 and a single-core score of 1468. The i7-12800HE has no Geekbench entry in the database, so the comparison is limited to the Cinebench suite. Still, the available data is unambiguous: the older desktop part leads in every measured metric.

When contextualized by the broader database, both processors sit at the 62nd percentile among all CPUs. Their average benchmark scores are 6657 for the i9-9940X and 6467 for the i7-12800HE. That puts the i9-9940X about 3% ahead on average, which aligns with the head-to-head deltas. The nearest rivals for the i9-9940X include the AMD Ryzen Threadripper 2950X with an average score of 6647 (a 0.1% delta) and the Intel Core i5-13400E at 6638 (0.3% delta). For the i7-12800HE, the closest competitors are the Intel Xeon D-2796TE at 6510 (a -0.7% delta) and the Intel Xeon W-2191B at 6531 (-1% delta). The data places the i9-9940X marginally above its immediate neighbors, while the i7-12800HE sits slightly below its closest rivals.

Where Each One Wins

The i9-9940X wins in every head-to-head benchmark, so the use-case split is heavily skewed toward the desktop part. In all six Cinebench tests, the i9-9940X delivers a lead between 6.3% and 6.5%. That includes both multi-threaded rendering and single-threaded tasks, meaning the i9-9940X is the better choice for content creation, 3D rendering, and CPU-bound productivity workloads where Cinebench scores are indicative.

The i7-12800HE does not win any of the recorded benchmarks, but it is not without merit in the broader context. It is a mobile processor with a 45 W TDP, compared to the 165 W TDP of the i9-9940X. The i7-12800HE also includes integrated Iris Xe graphics with 96 execution units, which the i9-9940X lacks entirely. For systems that need a built-in display output or GPU fallback, the i7-12800HE has a functional advantage, even though it is not captured in the CPU benchmark scores.

The i7-12800HE also supports DDR5 memory, while the i9-9940X is limited to DDR4. The mobile part uses a dual-channel memory bus, whereas the desktop part uses quad-channel. The i9-9940X has a higher memory bandwidth figure of 85.3 GB/s, but the i7-12800HE's support for newer memory technology could matter in memory-sensitive workloads that are not reflected in the Cinebench suite.

For raw compute, the i9-9940X is the clear winner. For mobile deployment, lower power draw, integrated graphics, and modern memory support, the i7-12800HE holds appeal. The data does not show any CPU benchmark where the i7-12800HE outperforms the i9-9940X, so the mobile part's advantages are qualitative, not numerical in this comparison.

Architecture Differences

The two processors come from different eras and design philosophies. The i9-9940X is built on the Skylake architecture, specifically the Skylake-X variant, using a 14 nm process node. It is a desktop part for the Intel Socket 2066 platform, released in October 2018, and is now end-of-life. The i7-12800HE uses the Alder Lake architecture, specifically Alder Lake-H, on a 10 nm node. It is a mobile part for the Intel BGA 1744 socket and remains in active production.

Both have 14 cores, but the thread counts differ. The i9-9940X supports 28 threads, meaning all cores are hyper-threaded. The i7-12800HE supports 20 threads, which indicates a hybrid configuration typical of Alder Lake, where certain cores do not support hyper-threading. The base clock for the i9-9940X is 3.30 GHz, while the i7-12800HE runs at 2.40 GHz. The boost clocks are closer: 4.50 GHz for the i9-9940X and 4.60 GHz for the i7-12800HE. The higher boost on the mobile part does not translate into a benchmark win, likely because the thermal and power envelope limits sustained performance.

Cache configurations also diverge. The i9-9940X has 64 KB of L1 cache per core, 1 MB of L2 per core, and 19.25 MB of shared L3. The i7-12800HE has 80 KB of L1 per core, 1.25 MB of L2 per core, and 24 MB of shared L3. The i7-12800HE has more L3 cache overall, but the i9-9940X still wins in the benchmarks. The die size difference is notable: the i9-9940X measures 484 mm², while the i7-12800HE is 217 mm². That reflects the more complex memory controller and PCIe layout of the desktop part.

Memory support differs as well. The i9-9940X uses DDR4 with a quad-channel bus and a recorded memory bandwidth of 85.3 GB/s. The i7-12800HE supports both DDR4 and DDR5, but uses a dual-channel bus, and no bandwidth figure is recorded in the database. The i9-9940X offers 44 PCIe Gen 3 lanes, while the i7-12800HE provides 20 PCIe Gen 4 lanes. The i7-12800HE has integrated Iris Xe graphics with 96 execution units; the i9-9940X has no integrated graphics. The i9-9940X has an unlocked multiplier, while the i7-12800HE does not. Neither supports ECC memory.

The i9-9940X launched with an MSRP of $1387, while no launch MSRP is recorded for the i7-12800HE. The production status of the i9-9940X is end-of-life, whereas the i7-12800HE is active.

FAQ

Q: Which CPU has more threads?

A: The Intel Core i9-9940X has 28 threads, while the Intel Core i7-12800HE has 20 threads. Both have 14 cores.

Q: Does the i7-12800HE ever beat the i9-9940X in the recorded benchmarks?

A: No. The i7-12800HE loses all six head-to-head tests, with the i9-9940X winning by deltas between 6.3% and 6.5% across Cinebench R15, R20, and R23.

Q: What is the memory bandwidth of the i9-9940X?

A: The i9-9940X has a recorded memory bandwidth of 85.3 GB/s, using a quad-channel DDR4 bus. The i7-12800HE uses a dual-channel bus and supports both DDR4 and DDR5, but its bandwidth is not recorded.

Q: Which processor has integrated graphics?

A: The Intel Core i7-12800HE includes Iris Xe graphics with 96 execution units. The Intel Core i9-9940X has no integrated graphics.

Q: How do the average benchmark scores compare?

A: The i9-9940X has an average benchmark score of 6657, while the i7-12800HE has an average of 6467. Both sit at the 62nd percentile among all CPUs.

Q: What is the process node difference?

A: The i9-9940X is built on a 14 nm process, while the i7-12800HE uses a 10 nm process. The i9-9940X has a die size of 484 mm², and the i7-12800HE has a die size of 217 mm².

The Verdict

The data is straightforward: the Intel Core i9-9940X outperforms the Intel Core i7-12800HE in every recorded benchmark. The i9-9940X leads by 6.5% in Cinebench R15, R20, and R23 multi-core tests, and by 6.3% to 6.5% in the single-core variants. Its average benchmark score is 6657 versus 6467, a roughly 3% overall advantage. For anyone prioritizing raw CPU compute, the i9-9940X is the superior part.

The i7-12800HE, however, is a mobile processor with a 45 W TDP, integrated graphics, and support for DDR5 memory. It is not designed to compete with a 165 W desktop part on throughput. Its advantages are in power efficiency, platform integration, and modern memory support. The i7-12800HE also has a higher boost clock at 4.60 GHz, but that does not overcome the i9-9940X's higher base clock, larger thread count, and quad-channel memory bandwidth.

The i9-9940X is the pick for desktop workstations where multi-threaded rendering and sustained all-core loads matter. The i7-12800HE is the pick for mobile systems where power draw, integrated graphics, and DDR5 support are priorities. The benchmark record does not support any scenario where the i7-12800HE wins a CPU compute test. The i9-9940X is end-of-life, but its performance remains competitive, as shown by its 62nd percentile standing and its near-even competition with the AMD Ryzen Threadripper 2950X, which scores 6647 with a 0.1% delta. The i7-12800HE sits slightly below its own nearest rivals, including the Intel Xeon D-2796TE and the Intel Xeon W-2191B, with deltas of -0.7% and -1% respectively.

For a desktop builder who needs maximum compute from the record, the i9-9940X is the clear choice. For a laptop designer or a user requiring integrated graphics and a lower thermal envelope, the i7-12800HE is the functional option, but the performance gap is real and consistent. The verdict from the database is unambiguous: the i9-9940X wins on every measured CPU metric.