Intel Core i7-1280P vs Intel Core i9-11900K Comparison

The Intel Core i9-11900K and Intel Core i7-1280P represent two very different Intel philosophies from consecutive generations. The i9-11900K is a desktop flagship from Rocket Lake, while the i7-1280P is a mobile processor from Alder Lake. The benchmark data shows a decisive victory for the desktop part, with the i9-11900K winning 15 of 17 head-to-head tests. However, the i7-1280P is not without its own advantages, particularly in specific physics workloads and power efficiency. The data reveals a clear performance hierarchy, but also highlights why each processor might be the right choice for different use cases.

Head-to-Head Benchmarks

The i9-11900K dominates the multi-core landscape with substantial margins. The largest gap appears in Cinebench R23 multi-core, where the desktop chip scores 21,168 against the mobile chip's 11,666. This is an 81.5% advantage, a massive leap that underscores the benefits of higher sustained power limits and desktop cooling. Similarly, in Cinebench R20 multi-core, the i9-11900K scores 8,890 versus 7,153, a 24.3% lead. The PassMark multi-thread test tells a similar story, with the i9-11900K at 25,038 and the i7-1280P at 20,168, a 24.1% difference.

Single-core performance also favors the desktop chip, though with a more nuanced pattern. In Cinebench R15 single-core, the i9-11900K scores 300 against 238, a 26.1% advantage. The newer architecture of the i7-1280P helps close the gap in some tests, but the i9-11900K's high boost clock still wins. In PassMark single-thread, the difference narrows to just 5.9%, with the i9-11900K posting 3,511 versus 3,316. Interestingly, the i9-11900K's lead in Cinebench R23 single-core is a massive 81%, scoring 2,988 versus 1,651, which is an outlier compared to other single-thread results.

The i7-1280P manages to secure two wins, and they are notable. In PassMark physics, the mobile chip scores 1,411 against 1,052, a 25.4% lead. This suggests a significant advantage in physics simulation tasks. The other win comes in PassMark find prime numbers, where the i7-1280P scores 86 versus 68, a 20.9% advantage. These are specialized workloads, but they show the i7-1280P's hybrid architecture has strengths beyond raw throughput.

Beyond the headline Cinebench numbers, the i9-11900K shows broad superiority in other tasks. In PassMark extended instructions, it scores 23,406 versus 12,897, an 81.5% lead. Data compression also heavily favors the desktop part, with a score of 330,836 versus 220,621, a 50% advantage. Integer math and random string sorting also go to the i9-11900K, with leads of 18.3% and 56.1% respectively. The desktop chip even wins in data encryption (16,000 vs 13,179, a 21.4% lead) and floating-point math (52,841 vs 51,355, a 2.9% lead), showing that its older architecture remains competitive in these areas.

Architecture Differences

The two processors come from different architectural generations and target different market segments. The i9-11900K is built on the Rocket Lake architecture and uses a 14 nm process node. It features 8 cores and 16 threads. Its die size is 276 mm². The i7-1280P, on the other hand, uses the Alder Lake architecture on a 10 nm process node. It has 14 cores and 20 threads, with a smaller die size of 217 mm². This difference in core count and process technology is fundamental, but it does not translate into a performance win for the mobile chip in most tests.

Cache configurations also differ. The i9-11900K has 80 KB of L1 cache per core, 512 KB of L2 cache per core, and 16 MB of shared L3 cache. The i7-1280P also has 80 KB of L1 per core, but its L2 is larger at 1.25 MB per core, and its L3 is 24 MB shared. Despite having more cache, the i7-1280P still loses most benchmarks to the i9-11900K. The L3 cache difference is notable, but it does not help in the benchmark results.

Memory support is another point of divergence. The i9-11900K supports DDR4 memory only, with a dual-channel bus and a memory bandwidth of 51.2 GB/s. The i7-1280P supports both DDR4 and DDR5, also with a dual-channel bus, but its memory bandwidth is not listed in the data. The i9-11900K has a higher base clock of 3.50 GHz and a boost clock of 5.30 GHz, while the i7-1280P has a base clock of 1.80 GHz and a boost clock of 4.80 GHz. This clock speed difference is likely a major factor in the i9-11900K's single-thread wins.

Both processors support PCIe Gen 4 with 20 lanes from the CPU. They both lack ECC memory support. The integrated graphics differ, with the i9-11900K featuring UHD Graphics 750 and the i7-1280P featuring Iris Xe 96EU. The power envelopes are wildly different: the i9-11900K has a TDP of 125 watts, while the i7-1280P has a TDP of just 28 watts. This explains the i9-11900K's ability to sustain high performance, but also points to the i7-1280P's efficiency.

The i9-11900K is an unlocked multiplier part, while the i7-1280P is locked. The desktop chip uses the Intel Socket 1200, and the mobile part uses Intel BGA 1744. The i9-11900K was released in March 2021, and the i7-1280P was released in February 2022. The desktop part is end-of-life, while the mobile part is still active in production. The i9-11900K also has a launch MSRP of $539, while the i7-1280P does not have a listed launch MSRP.

Where Each One Wins

The benchmark data strongly favors the i9-11900K for compute-intensive work. Its wins in Cinebench R23 multi-core (81.5% lead) and PassMark extended instructions (81.5% lead) show it is better suited for rendering, video encoding, and other tasks that leverage SIMD instructions. The 50% lead in data compression and the 56.1% lead in random string sorting further reinforce its strengths in data processing and archival workloads. The 24.3% lead in Cinebench R20 multi-core and the 24.1% lead in PassMark multi-thread confirm that the i9-11900K is the better choice for heavy multi-threaded applications.

The i9-11900K also wins in single-threaded tests, which is a key metric for everyday responsiveness. Its 26.1% lead in Cinebench R15 single-core and 5.9% lead in PassMark single-thread show that it offers better performance in lightly-threaded workloads. This is partly due to its higher boost clock of 5.30 GHz versus 4.80 GHz. However, the i7-1280P's wins are not negligible. Its 25.4% lead in PassMark physics suggests it is better for physics simulations, which are common in scientific computing and certain game engines. The 20.9% lead in PassMark find prime numbers also indicates a strength in integer-based, sequential algorithms.

The i7-1280P's lower TDP of 28 watts versus 125 watts makes it the clear winner for mobile and battery-powered scenarios. It is an active production part, while the i9-11900K is end-of-life. The i7-1280P's support for both DDR4 and DDR5 memory gives it more flexibility in system design. It also has more cores and threads (14/20 versus 8/16), which could be an advantage in workloads that scale well with thread count, but the data shows the i9-11900K's higher clocks and desktop power budget overcome this deficit in most tests.

For gaming, the i9-11900K's single-thread wins are important, as many games are still single-thread bound. However, the i7-1280P's physics win could be relevant for games that use heavy physics calculations. The i9-11900K's larger die size of 276 mm² suggests it has more silicon dedicated to compute, while the i7-1280P's smaller 217 mm² die is more optimized for power efficiency.

The Verdict

The data is clear: the Intel Core i9-11900K is the superior processor for raw performance in almost every benchmark category. It wins 15 of the 17 head-to-head tests, with particularly strong margins in multi-core and SIMD workloads. Its 81.5% lead in Cinebench R23 multi-core and its 81.5% lead in PassMark extended instructions are decisive. For users who need maximum compute power for rendering, encoding, data compression, or heavy multi-threaded applications, the i9-11900K is the clear choice, despite its older 14 nm architecture and higher TDP.

The Intel Core i7-1280P should be chosen by users who prioritize power efficiency and mobility. Its 28-watt TDP is a fraction of the i9-11900K's 125-watt TDP, making it ideal for laptops and compact systems where thermal and power constraints are critical. Its wins in PassMark physics and find prime numbers are specific but real advantages for those workloads. The i7-1280P is also an active product, while the i9-11900K is end-of-life, meaning the mobile chip has a longer support horizon.

The i9-11900K's launch MSRP of $539 positions it as a high-end part, but its performance in the data justifies that positioning for desktop users. The i7-1280P is a different beast, focusing on efficiency and portability. The i9-11900K's 79th percentile versus all CPUs is slightly higher than the i7-1280P's 78th percentile, confirming that the desktop chip has a marginal edge in overall standing. The i9-11900K's nearest rivals include the Intel Core i7-12700H with a delta of -0.3%, while the i7-1280P's closest rival is the Intel Core i9-12900HK with a delta of 0%. This shows both chips are competitive within their respective segments.

FAQ

Q: Which processor has a higher score in Cinebench R23 multi-core?

A: The Intel Core i9-11900K scores 21,168, which is 81.5% higher than the Intel Core i7-1280P's score of 11,666.

Q: Does the Intel Core i7-1280P win any benchmarks against the i9-11900K?

A: Yes, the i7-1280P wins in PassMark physics with a score of 1,411 versus 1,052, a 25.4% lead, and in PassMark find prime numbers with a score of 86 versus 68, a 20.9% advantage.

Q: What is the difference in TDP between the two processors?

A: The i9-11900K has a TDP of 125 watts, while the i7-1280P has a TDP of 28 watts.

Q: How many cores and threads does each processor have?

A: The i9-11900K has 8 cores and 16 threads, while the i7-1280P has 14 cores and 20 threads.

Q: Which processor supports DDR5 memory?

A: The Intel Core i7-1280P supports both DDR4 and DDR5 memory, while the Intel Core i9-11900K supports DDR4 only.

Q: What is the average benchmark score difference between the two chips?

A: The i9-11900K has an average benchmark score of 26,639, which is slightly higher than the i7-1280P's average score of 26,469.