Intel Core i7-12700E vs Intel Core i9-9940X Comparison

Head-to-Head Benchmarks

The Intel Core i7-12700E sweeps every benchmark in this comparison, but the margin tells the real story. In Cinebench R15, R20, and R23, the i7-12700E wins by a uniform 0.3% across both multi-core and single-core tests. That is a statistical tie in rendering workloads — the i7-12700E scores 2406 vs 2400 in R15 multi-core, 10029 vs 10000 in R20 multi-core, and 23879 vs 23810 in R23 multi-core. Single-core results are equally tight: 339 vs 338, 1415 vs 1411, and 3371 vs 3361 respectively.

The pattern breaks decisively in Geekbench. The i7-12700E posts a 42.6% single-core advantage, scoring 2094 against the i9-9940X's 1468. That is the largest delta in the entire head-to-head set. In Geekbench multi-core, the i7-12700E leads by 2% (10676 vs 10466). The 42.6% single-core gap is not a minor edge — it reflects a fundamental architectural difference that shows up in latency-sensitive and lightly-threaded workloads.

Average benchmark scores reinforce the overall picture: the i7-12700E averages 6776 points across its benchmark suite, while the i9-9940X averages 6657. The i7-12700E sits in the 62nd percentile of all CPUs, and the i9-9940X also sits in the 62nd percentile — identical ranking despite the score gap. The i7-12700E's nearest rivals include the AMD Ryzen Threadripper 2970WX (0.2% ahead) and Intel Xeon Gold 6154 (0.4% behind), while the i9-9940X's nearest rivals include the AMD Ryzen Threadripper 2950X (0.1% ahead) and Intel Core i5-13400E (0.3% ahead).

The core count mismatch is notable: the i9-9940X has 14 cores and 28 threads, versus 12 cores and 20 threads for the i7-12700E. Yet the i7-12700E still wins every multi-core benchmark. The 0.3% margins in Cinebench suggest the i7-12700E's newer architecture compensates for its two-core deficit. The i9-9940X's higher base clock (3.30 GHz vs 2.10 GHz) and boost clock (4.50 GHz vs 4.80 GHz) do not translate into wins anywhere.

FAQ

Q: Which CPU has the higher single-core score?

A: The Intel Core i7-12700E wins single-core in every test, with the largest margin being 42.6% in Geekbench (2094 vs 1468). In Cinebench R23 single-core, the i7-12700E scores 3371 vs the i9-9940X's 3361, a 0.3% lead.

Q: Does the i9-9940X win in any benchmark?

A: No. The i7-12700E wins all 8 head-to-head benchmark comparisons. The i9-9940X's closest result is in Cinebench R15 multi-core, where it trails by only 0.3% (2400 vs 2406).

Q: How do the core and thread counts differ?

A: The i9-9940X has 14 cores and 28 threads, while the i7-12700E has 12 cores and 20 threads. Despite having fewer cores, the i7-12700E wins every multi-core benchmark in the comparison.

Q: What is the production status of each CPU?

A: The i7-12700E is listed as "Active" production, while the i9-9940X is "End-of-life." The i9-9940X was released on 2018-10-18, whereas the i7-12700E has no release date listed.

Q: What memory configurations do they support?

A: The i7-12700E supports DDR4 and DDR5 with a dual-channel memory bus. The i9-9940X supports only DDR4 but uses a quad-channel bus with 85.3 GB/s memory bandwidth.

Q: Which CPU has integrated graphics?

A: The i7-12700E includes UHD Graphics 770, while the i9-9940X has no integrated graphics.

The Verdict

The data points to a clear winner: the Intel Core i7-12700E dominates the i9-9940X in every single benchmark. If you prioritize single-threaded performance, the choice is obvious — the i7-12700E's 42.6% Geekbench single-core lead is overwhelming. For multi-threaded workloads like Cinebench rendering, the i7-12700E still wins, though by a slim 0.3% margin across all three Cinebench versions.

The i9-9940X is end-of-life, while the i7-12700E remains active production. The i9-9940X has more cores (14 vs 12) and more threads (28 vs 20), but that hardware advantage never converts into a benchmark win. The i7-12700E also carries integrated graphics (UHD Graphics 770), which the i9-9940X lacks entirely.

The launch MSRP values differ sharply: the i7-12700E launched at $344, while the i9-9940X launched at $1387. The i9-9940X is an older, higher-priced product that cannot outperform its younger, lower-priced competitor in any measured test. The only scenario where the i9-9940X looks preferable is if you specifically need quad-channel DDR4 memory (85.3 GB/s bandwidth) or require 44 PCIe Gen 3 lanes — the i7-12700E offers 20 PCIe Gen 5 lanes. For general computing, rendering, and single-threaded tasks, the i7-12700E is the data-backed choice.

Specification Differences

The two CPUs diverge on nearly every major specification. The i7-12700E uses 12 cores and 20 threads, while the i9-9940X uses 14 cores and 28 threads. Base clocks differ significantly: 2.10 GHz for the i7-12700E versus 3.30 GHz for the i9-9940X. Boost clocks are closer, with the i7-12700E at 4.80 GHz and the i9-9940X at 4.50 GHz. Thermal design power is a major split: 65 W for the i7-12700E versus 165 W for the i9-9940X.

Socket compatibility is completely different. The i7-12700E uses Intel Socket 1700, while the i9-9940X uses Intel Socket 2066. The i7-12700E supports both DDR4 and DDR5 memory with a dual-channel bus; the i9-9940X supports only DDR4 with a quad-channel bus and 85.3 GB/s bandwidth. PCIe capabilities favor the i9-9940X in lane count (44 Gen 3 lanes vs 20 Gen 5 lanes) but the i7-12700E in generation.

Cache layouts differ as well. The i7-12700E has 80 KB L1 per core, 1.25 MB L2 per core, and 25 MB shared L3. The i9-9940X has 64 KB L1 per core, 1 MB L2 per core, and 19.25 MB shared L3. The i7-12700E includes UHD Graphics 770; the i9-9940X has no integrated graphics. The i7-12700E's multiplier is locked, while the i9-9940X's is unlocked. Production status also differs: the i7-12700E is active, and the i9-9940X is end-of-life.

Architecture Differences

The i7-12700E is built on Alder Lake architecture (codename Alder Lake-S) using a 10 nm process with a 215 mm² die size. The i9-9940X uses Skylake architecture (codename Skylake-X) on a 14 nm process with a 484 mm² die size. The process node advantage is substantial — 10 nm versus 14 nm — and the i7-12700E achieves its performance with a die less than half the size (215 mm² vs 484 mm²).

Both CPUs are manufactured by Intel. The i7-12700E belongs to Core 12th Gen, while the i9-9940X belongs to Core i9 X-Series 9th Gen. The i7-12700E's cache hierarchy is denser per core: 80 KB L1 and 1.25 MB L2 per core versus 64 KB L1 and 1 MB L2 per core. Total L3 cache favors the i7-12700E at 25 MB shared, compared to 19.25 MB shared on the i9-9940X.

The i7-12700E supports DDR4 and DDR5 memory, whereas the i9-9940X is limited to DDR4. The i9-9940X compensates with a quad-channel memory bus and 85.3 GB/s bandwidth, but the i7-12700E's dual-channel setup covers both memory generations. The i7-12700E includes integrated UHD Graphics 770, which the i9-9940X does not offer — a meaningful difference for systems without a discrete GPU. The i9-9940X has an unlocked multiplier for overclocking, while the i7-12700E does not. Both CPUs lack ECC memory support.

Where Each One Wins

The i7-12700E wins in every benchmark category, so the "where each one wins" split is really about workload characteristics and platform features. For single-threaded applications, the i7-12700E is the clear pick — its 42.6% Geekbench single-core lead (2094 vs 1468) indicates markedly better per-thread performance. This matters for everyday responsiveness, legacy software, and games that rely on a few fast cores.

For multi-threaded rendering, the i7-12700E wins by smaller margins — 0.3% in all three Cinebench versions. The i9-9940X's extra cores (14 vs 12) and threads (28 vs 20) nearly close the gap, but the i7-12700E's newer architecture still edges ahead. If you need maximum multi-threaded throughput, the i7-12700E is technically the winner, though the margin is thin enough that other platform factors might matter more.

The i9-9940X's strongest case is platform connectivity. It offers 44 PCIe Gen 3 lanes versus 20 PCIe Gen 5 lanes, and quad-channel DDR4 memory with 85.3 GB/s bandwidth. For systems requiring many PCIe devices (multiple GPUs, high-speed storage adapters) or quad-channel memory bandwidth, the i9-9940X provides capabilities the i7-12700E cannot match — even though it loses every CPU benchmark.

The i7-12700E wins on efficiency and integration. Its 65 W TDP is dramatically lower than the i9-9940X's 165 W, and it includes UHD Graphics 770. The i7-12700E's 10 nm process and 215 mm² die make it a more modern, compact design. Its DDR5 support future-proofs memory upgrades, while the i9-9940X is locked to DDR4. For most users, the i7-12700E is the data-driven recommendation; the i9-9940X only makes sense for specialized builds that need its PCIe lane count or quad-channel memory architecture.