Intel Core i7-1280P vs Intel Core i9-9900K Comparison

Head-to-Head Benchmarks

The benchmark data reveals a clear split between the Intel Core i9-9900K and the Intel Core i7-1280P, with the mobile chip winning 12 of the 17 recorded head-to-head comparisons. The i7-1280P takes the majority of the Cinebench and Passmark tests, but the i9-9900K dominates in specific workloads where its architecture and cache configuration prove decisive.

Starting with the Cinebench suite, the results are mixed across versions. In Cinebench R15 multicore, the i7-1280P scores 2112 against the i9-9900K's 1545, a 26.8% advantage. The single-core R15 test also favors the i7-1280P, scoring 238 versus 217, an 8.8% lead. Cinebench R20 shows a similar pattern: the i7-1280P leads by 10% in both multicore (7153 vs 6439) and single-core (1009 vs 908). However, the tables turn dramatically in Cinebench R23. The i9-9900K scores 15333 in multicore versus 11666 for the i7-1280P, a 31.4% margin. In R23 single-core, the i9-9900K scores 2164 against 1651, a 31.1% lead. This inversion suggests that the newer R23 workload rewards the i9-9900K's higher sustained clock behavior and larger L3 cache under extended multithreaded loads.

The Passmark suite further illustrates the split. The i9-9900K wins decisively in random string sorting, scoring 36238 versus 24308, a 49.1% advantage. It also leads in extended instructions (18965 vs 12897, 47% ahead) and data compression (283506 vs 220621, 28.5% ahead). These are memory-latency-sensitive and SIMD-heavy workloads where the i9-9900K's desktop platform and 16 MB shared L3 cache provide an edge.

Conversely, the i7-1280P dominates in compute-oriented Passmark tests. It scores 13179 in data encryption versus 6430, a 51.2% lead, reflecting its newer instruction set and higher core count. The i7-1280P also wins in find prime numbers (86 vs 47, 45.3% ahead), floating point math (51355 vs 41036, 20.1% ahead), and integer math (75485 vs 66134, 12.4% ahead). Its 20168 multithread score beats the i9-9900K's 18153 by 10%, and its physics score of 1411 is 33.8% higher than 934. The single-thread Passmark test also favors the i7-1280P at 3316 versus 2919, a 12% lead.

Overall, the i9-9900K wins 5 benchmarks, while the i7-1280P wins 12. The average benchmark score for the i9-9900K is 27097, placing it at the 79th percentile among all CPUs. The i7-1280P averages 26469, at the 78th percentile. The delta is small, 2.3%, but the distribution of wins matters more than the aggregate.

Architecture Differences

The two processors come from different Intel generations and target different platforms. The i9-9900K uses the Coffee Lake architecture on a 14 nm process node, with a die size of 180.3 mm². It fits the Intel Socket 1151 and is a desktop part. The i7-1280P uses the Alder Lake architecture on a 10 nm node, with a larger die at 217 mm², and fits the Intel BGA 1744 socket, indicating a mobile design.

Core and thread counts differ significantly. The i9-9900K has 8 cores and 16 threads, all using the same microarchitecture. The i7-1280P has 14 cores and 20 threads, which implies a hybrid arrangement of performance and efficiency cores, though the data does not specify the split. The i7-1280P's base clock is listed as 1800.00 MHz, which is far lower than the i9-9900K's 3.60 GHz, but its boost clock of 4.80 GHz is close to the i9-9900K's 5.00 GHz. The i9-9900K has a 95 W TDP, while the i7-1280P is rated at 28 W, reflecting the mobile power envelope.

Cache hierarchies differ. The i9-9900K has 64 KB L1 per core, 256 KB L2 per core, and 16 MB shared L3. The i7-1280P has 80 KB L1 per core, 1.25 MB L2 per core, and 24 MB shared L3. The larger per-core L2 and overall L3 on the i7-1280P likely contribute to its wins in integer and floating point math, while the i9-9900K's uniform core design and higher sustained clocks may explain its R23 and string sorting advantages.

Memory support also differs. The i9-9900K supports DDR4 with dual-channel memory and a bandwidth of 42.7 GB/s. The i7-1280P supports both DDR4 and DDR5, also dual-channel, but its bandwidth figure is not recorded in the database. The i9-9900K provides PCIe Gen 3 with 16 lanes (CPU only), while the i7-1280P provides PCIe Gen 4 with 20 lanes (CPU only). Integrated graphics differ as well: the i9-9900K uses UHD Graphics 630, while the i7-1280P uses Iris Xe 96EU, which is a more capable iGPU.

Production status and release dates differ. The i9-9900K is end-of-life and was released on 2018-10-18, with a launch MSRP of $488. The i7-1280P is active and was released on 2022-02-22, with no launch MSRP recorded. The i9-9900K has an unlocked multiplier, while the i7-1280P is locked. The i7-1280P is the newer design, but the i9-9900K remains competitive in several workloads.

Where Each One Wins

The i9-9900K is the stronger choice for workloads that stress memory bandwidth, cache coherence, and sustained multithreaded performance over longer durations. Its 31.4% lead in Cinebench R23 multicore and 31.1% lead in R23 single-core indicate that modern rendering and 3D modeling tasks favor this desktop chip. The 49.1% advantage in random string sorting points to strengths in data structure manipulation and sorting algorithms, common in database and analytics workloads. The 47% lead in extended instructions suggests a benefit for legacy SIMD-optimized applications, and the 28.5% edge in data compression favors archival and file-transfer tasks.

The i7-1280P is better suited for general compute and encryption-heavy tasks. Its 51.2% lead in data encryption is the largest margin in the comparison, indicating strong AES and cryptographic performance, likely from newer instruction set extensions. The 45.3% advantage in find prime numbers reflects efficiency in integer-heavy algorithmic loops. The i7-1280P also leads in floating point math by 20.1% and integer math by 12.4%, making it a better fit for scientific simulations, financial modeling, and number-crunching applications that leverage many cores. Its 10% lead in multithread Passmark and 33.8% lead in physics suggest advantages in game physics calculations and parallel task scheduling.

For single-thread responsiveness, the i7-1280P wins in Passmark single-thread by 12% and in Cinebench R15/R20 single-core by 8.8% to 10%. This indicates snappier everyday application performance, despite the i9-9900K's higher boost clock. The i7-1280P's newer architecture and larger L2 cache likely compensate for its lower base frequency.

The Verdict

The data supports a clear split by use case. For desktop users with tasks that involve sorting, compression, or long-running rendering workloads, the i9-9900K is the better performer. Its Cinebench R23 multicore score of 15333 is 31.4% above the i7-1280P, and its random string sorting score is 49.1% higher. The i9-9900K also ranks at the 79th percentile among all CPUs, slightly above the i7-1280P's 78th percentile, and its average benchmark score of 27097 is higher than 26469.

For mobile users or those prioritizing encryption, math, and physics computations, the i7-1280P is the clear winner. Its 12 wins out of 17 head-to-head benchmarks, including a 51.2% lead in data encryption and a 45.3% lead in prime number finding, make it the more versatile all-rounder. The 28 W TDP also makes it suitable for thin-and-light laptops, whereas the i9-9900K requires a desktop platform with a 95 W thermal envelope.

The i9-9900K is end-of-life and has a launch MSRP of $488, but it remains viable for specific desktop workloads. The i7-1280P is active and offers superior compute density per watt, though its mobile socket limits upgradeability. The recorded data does not show a single winner across all tests; the choice depends on whether the workload resembles the i9-9900K's strengths (Cinebench R23, sorting, compression) or the i7-1280P's strengths (encryption, math, physics).

FAQ

Q: Which CPU has the higher single-core score in Cinebench R23?

A: The Intel Core i9-9900K scores 2164, which is 31.1% higher than the i7-1280P's 1651.

Q: How much faster is the i7-1280P in data encryption?

A: The i7-1280P scores 13179 versus 6430, a 51.2% lead over the i9-9900K.

Q: What is the core and thread count difference?

A: The i9-9900K has 8 cores and 16 threads, while the i7-1280P has 14 cores and 20 threads.

Q: Which processor has the larger L3 cache?

A: The i7-1280P has 24 MB shared L3, while the i9-9900K has 16 MB shared L3.

Q: What is the TDP for each?

A: The i9-9900K is rated at 95 W, and the i7-1280P is rated at 28 W.

Q: Which chip wins more head-to-head benchmarks?

A: The i7-1280P wins 12 of the 17 recorded comparisons, while the i9-9900K wins 5.

Specification Differences

| Specification | Intel Core i9-9900K | Intel Core i7-1280P |

|----------------|---------------------|----------------------|

| Cores | 8 | 14 |

| Threads | 16 | 20 |

| Base Clock | 3.60 GHz | 1800.00 MHz |

| Boost Clock | 5.00 GHz | 4.80 GHz |

| TDP | 95 W | 28 W |

| Socket | Intel Socket 1151 | Intel BGA 1744 |

| Architecture | Coffee Lake | Alder Lake |

| Process Node | 14 nm | 10 nm |

| Die Size | 180.3 mm² | 217 mm² |

| L1 Cache | 64 KB (per core) | 80 KB (per core) |

| L2 Cache | 256 KB (per core) | 1.25 MB (per core) |

| L3 Cache | 16 MB (shared) | 24 MB (shared) |

| Memory Support | DDR4 | DDR4, DDR5 |

| Memory Bandwidth | 42.7 GB/s | Not recorded |

| PCIe | Gen 3, 16 Lanes (CPU only) | Gen 4, 20 Lanes (CPU only) |

| Integrated Graphics | UHD Graphics 630 | Iris Xe 96EU |

| Market Segment | Desktop | Mobile |

| Production Status | End-of-life | Active |

| Release Date | 2018-10-18 | 2022-02-22 |

| Launch MSRP | $488 | Not recorded |

| Multiplier Unlocked | Yes | No |

| Part Number | SRG19SRELS | SRLD5 |

| Percentile vs All CPUs | 79 | 78 |

| Average Benchmark Score | 27097 | 26469 |