CPU Comparison

The Intel Core i9-12900K and Intel Core 7 251TE are both desktop processors on the Intel Socket 1700 platform, but they are fundamentally different designs. The i9-12900K is a 16-core, 24-thread Alder Lake-S part from late 2021, while the Core 7 251TE is a 24-core, 32-thread Bartlett Lake part released in early 2025. The data shows a clear split: the older flagship dominates in most multi-threaded and legacy-heavy workloads, while the newer part delivers a stunning single-core performance advantage in specific tests.

Head-to-Head Benchmarks

The head-to-head comparison is overwhelmingly one-sided in terms of victory count, with the Intel Core i9-12900K winning 15 of the 17 benchmark comparisons. However, the margins and the nature of those wins tell a more nuanced story than the raw tally suggests. The i9-12900K’s largest victories come in workloads that stress instruction-level parallelism and data manipulation, where its mature Alder Lake architecture holds a decisive edge.

The most dramatic win for the i9-12900K is in PassMark’s extended instructions test, where it scores 33,682 against the Core 7 251TE’s 16,974. That is a 98.4% advantage, effectively doubling the performance of the older chip in this specific AVX/vectorized workload. Similarly, in PassMark data compression, the i9-12900K posts 537,341 versus 334,399, a 60.7% lead. These are not marginal differences; they indicate that the i9-12900K’s core design and cache hierarchy are far better suited to heavy data processing routines.

The multi-core Cinebench results show a more complex pattern. In Cinebench R15 multi-core, the i9-12900K wins decisively with 4,057 points against 2,572, a 57.7% margin. The R20 multi-core test shows a 37% lead (14,679 vs 10,717). However, in Cinebench R23 multi-core, the gap narrows dramatically to just 2.4%, with the i9-12900K scoring 26,125 against the Core 7 251TE’s 25,518. This suggests that as the workload scales, the Core 7 251TE’s additional 8 cores and 8 threads begin to compensate for its lower per-core throughput, nearly closing the gap in the most demanding rendering scenario.

The single-core picture is where the Core 7 251TE strikes back, and it does so emphatically in one test. In Cinebench R23 single-core, the Core 7 251TE scores 3,602 against the i9-12900K’s 2,004.5, a 44.4% advantage for the newer chip. This is a massive generational leap in single-threaded performance. The R15 single-core test also goes to the Core 7 251TE (362 vs 289, a 20.2% win). However, the R20 single-core test goes the other way, with the i9-12900K winning 2,072 to 1,512, a 37% lead. This inconsistency across Cinebench versions is unusual and suggests different workload sensitivities between the two architectures.

In the remaining PassMark tests, the i9-12900K is consistently ahead, though the margins vary. It wins integer math by 10.6% (139,090 vs 125,739), floating-point math by 23.2% (105,471 vs 85,607), and multithread by 37.3% (41,213 vs 30,022). The i9-12900K also takes data encryption (29,579 vs 22,176, a 33.4% lead), random string sorting (57,094 vs 39,643, a 44% lead), and physics (2,219 vs 1,938, a 14.5% lead). Even in the find prime numbers test, the i9-12900K wins, albeit narrowly, at 147 vs 140, a 5% margin. The single-thread PassMark test also goes to the i9-12900K, at 4,136 vs 3,568, a 15.9% lead, which contradicts the Cinebench R23 single-core result and highlights the test-specific nature of these benchmarks.

Where Each One Wins

Based on the benchmark data, the Intel Core i9-12900K is the clear winner for users whose workloads are heavily multi-threaded and involve substantial data manipulation. The data shows it is dramatically better in extended instruction sets (98.4% ahead), data compression (60.7% ahead), and random string sorting (44% ahead). For content creation tasks like video editing, 3D rendering, and software compilation, the i9-12900K’s lead in Cinebench R15 and R20 multi-core, as well as its 37.3% advantage in PassMark multithread, makes it the superior choice. The i9-12900K also holds a strong edge in encryption and floating-point math, making it suitable for scientific computing and financial modeling. Its 30 MB of shared L3 cache and 76.8 GB/s memory bandwidth, while lower than the Core 7 251TE’s 36 MB and 89.6 GB/s, still prove sufficient to deliver these wins.

The Intel Core 7 251TE’s wins are narrow but significant in the context of modern applications. Its 44.4% victory in Cinebench R23 single-core is a massive advantage for tasks that are primarily single-threaded. This includes many legacy applications, some game engines that rely on a single primary thread, and general desktop responsiveness. The 20.2% win in Cinebench R15 single-core reinforces this strength. For users who prioritize snappy single-threaded performance over raw multi-core throughput, the Core 7 251TE is the better option. Furthermore, its near-parity in Cinebench R23 multi-core (just 2.4% behind) means that it does not sacrifice all multi-core capability, making it a more balanced choice for mixed workloads. The Core 7 251TE also offers higher memory bandwidth (89.6 GB/s vs 76.8 GB/s), which could benefit memory-sensitive applications despite the benchmark results not always reflecting this advantage.

The Verdict

The data presents a clear choice based on workload priority. For users who need maximum multi-threaded throughput and heavy data processing, the Intel Core i9-12900K is the definitive pick. Its average benchmark score of 42,335 is higher than the Core 7 251TE’s 41,650, and it sits at the 88th percentile among all CPUs. It outperforms its nearest rival, the Intel Core i9-12950HX, by a negligible 0.4% margin, but is 0.7% ahead of the AMD Ryzen 5 7400 and 1% ahead of the Intel Core i7-14700T. The i9-12900K is a proven multi-core workhorse that wins 15 of 17 head-to-head comparisons.

The Intel Core 7 251TE, while having a lower average benchmark score, is the pick for single-threaded performance. Its 88th percentile ranking matches the i9-12900K, but its nearest rivals are different, with the Intel Core Ultra 7 265H just 0.1% ahead and the Intel Core i7-14650HX 0.2% ahead. The Core 7 251TE is 0.3% behind the Intel Core i7-12850HX and 0.6% behind the Intel Core i7-14700T. The Core 7 251TE’s 5.40 GHz boost clock is higher than the i9-12900K’s 5.20 GHz, which likely contributes to its single-core wins. It also has a lower TDP of 45 watts versus 125 watts, indicating higher efficiency, though the benchmarks do not measure power draw directly. The Core 7 251TE is a locked multiplier part, while the i9-12900K is unlocked, giving the latter overclocking headroom that the data does not quantify.

FAQ

Q: Which processor is faster in single-core performance?

A: The Intel Core 7 251TE wins in Cinebench R23 single-core with a score of 3,602 versus 2,004.5 for the Intel Core i9-12900K, a 44.4% advantage. It also wins Cinebench R15 single-core with 362 vs 289, a 20.2% lead. However, the i9-12900K wins Cinebench R20 single-core (2,072 vs 1,512) and PassMark single-thread (4,136 vs 3,568).

Q: Which processor has more cores and threads?

A: The Intel Core 7 251TE has 24 cores and 32 threads. The Intel Core i9-12900K has 16 cores and 24 threads.

Q: What is the difference in L3 cache size?

A: The Intel Core 7 251TE has 36 MB of shared L3 cache, while the Intel Core i9-12900K has 30 MB of shared L3 cache.

Q: Do both processors support the same memory types?

A: Yes, both support DDR4 and DDR5 memory in a dual-channel configuration. The Intel Core 7 251TE has a higher memory bandwidth of 89.6 GB/s, while the Intel Core i9-12900K is rated at 76.8 GB/s.

Q: Which processor has a higher boost clock?

A: The Intel Core 7 251TE has a boost clock of 5.40 GHz, which is higher than the Intel Core i9-12900K’s boost clock of 5.20 GHz.

Q: Are both processors unlocked for overclocking?

A: No. The Intel Core i9-12900K has an unlocked multiplier, while the Intel Core 7 251TE does not.

Architecture Differences

The two processors represent different architectural eras despite sharing the Intel Socket 1700 platform and a 10 nm process node from Intel. The Intel Core i9-12900K is based on the Alder Lake architecture, specifically the Alder Lake-S codename. It features 16 cores and 24 threads, with a base clock of 3.20 GHz and a boost clock of 5.20 GHz. Its cache hierarchy includes 80 KB of L1 per core, 1.25 MB of L2 per core, and 30 MB of shared L3 cache. The i9-12900K has a TDP of 125 watts and a die size of 215 mm².

The Intel Core 7 251TE is based on the Bartlett Lake architecture, a newer design. It has 24 cores and 32 threads, with a much lower base clock of 1.40 GHz but a higher boost clock of 5.40 GHz. Its cache configuration is larger in L3, with 36 MB shared, while keeping the same 80 KB L1 per core and 1.25 MB L2 per core. The Core 7 251TE has a significantly lower TDP of 45 watts, though it shares the same 215 mm² die size as the i9-12900K. Both processors are manufactured by Intel on a 10 nm process and are fabricated by Intel’s foundry.

Both parts feature the integrated UHD Graphics 770 and support ECC memory. They both offer PCIe Gen 5 with 16 lanes from the CPU. The i9-12900K was released on November 3, 2021, while the Core 7 251TE was released on January 12, 2025. The i9-12900K has an unlocked multiplier, whereas the Core 7 251TE is locked. The i9-12900K’s launch MSRP is $599, and the Core 7 251TE’s launch MSRP is $384. The part numbers are SRL4H for the i9-12900K and SRQAXQ5ZG for the Core 7 251TE. The Core 7 251TE has a higher memory bandwidth rating of 89.6 GB/s compared to 76.8 GB/s for the i9-12900K.