Intel Core i9-11900T vs Intel Core i9-9900KF Comparison

The Intel Core i9-11900T and Intel Core i9-9900KF are both 8-core, 16-thread desktop processors, but they represent different architectural eras and design philosophies. The 11900T is a low-power Rocket Lake part with a 35 W TDP, while the 9900KF is a higher-clocked Coffee Lake Refresh chip with a 95 W TDP. Benchmark data shows a surprisingly close overall contest, with the 11900T taking seven of eight head-to-head wins, yet the 9900KF securing a decisive victory in one key multi-threaded workload. The average benchmark scores are nearly identical, with the 11900T at 4685 and the 9900KF at 4652, placing both at the 58th percentile among all CPUs.

Head-to-Head Benchmarks

The most striking result in the comparison is the Geekbench multicore test, where the Intel Core i9-9900KF outperforms the Intel Core i9-11900T by a significant margin. The 9900KF scores 8970 versus 8257 for the 11900T, a delta of -7.9% from the perspective of the 11900T. This is the only test where the 9900KF wins, and it does so by a wide margin, suggesting that the older chip’s higher sustained clocks and unlocked multiplier provide a substantial advantage in this particular workload.

Every other benchmark favors the Intel Core i9-11900T, though the margins are generally modest. In the Cinebench suite, the 11900T leads by exactly 2% across all four tests: R15 multicore (1572 vs 1541), R15 singlecore (221 vs 217), R20 multicore (6550 vs 6422), R20 singlecore (924 vs 906), and R23 multicore (15596 vs 15292). The single-core Cinebench results show a consistent pattern: the 11900T’s boost clock of 4.90 GHz, while slightly lower than the 9900KF’s 5.00 GHz, still delivers superior per-thread performance in these workloads.

The most dramatic single-core difference appears in Geekbench, where the 11900T scores 2157 against the 9900KF’s 1706, a massive 26.4% advantage. This is the largest delta in the entire head-to-head set and highlights a generational improvement in IPC (instructions per clock) for the Rocket Lake architecture. While the 9900KF can match or exceed the 11900T in some multi-threaded scenarios, its older core design lags far behind in single-threaded efficiency as measured by Geekbench.

Looking at the overall average benchmark scores, the difference is razor-thin: 4685 for the 11900T versus 4652 for the 9900KF, a 0.7% gap. This near-parity is reflected in their rival lists, where each chip lists the other as a close competitor. The 11900T’s nearest rival is the Intel Core i9-10900F at 4664 (0.5% difference), while the 9900KF’s closest rival is the same 10900F at -0.3%. The data suggests that despite different architectures and power profiles, these two processors deliver remarkably similar aggregate performance.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Core i9-11900T has a slightly higher average benchmark score of 4685 compared to the Intel Core i9-9900KF’s 4652. This puts the 11900T ahead by 0.7% in aggregate performance.

Q: How do the two CPUs compare in single-core Geekbench performance?

A: The Intel Core i9-11900T wins decisively with a score of 2157 versus 1706 for the 9900KF, a 26.4% advantage. This is the largest performance gap in any benchmark between the two processors.

Q: Does the 9900KF win any benchmark tests?

A: Yes, the 9900KF wins the Geekbench multicore test with a score of 8970 compared to the 11900T’s 8257, representing a 7.9% margin. This is its only victory in the eight head-to-head tests.

Q: What is the TDP difference between these processors?

A: The Intel Core i9-11900T has a TDP of 35 watts, while the Intel Core i9-9900KF has a TDP of 95 watts. This makes the 11900T significantly more power-efficient on paper.

Q: Are both processors unlocked for overclocking?

A: No. The Intel Core i9-9900KF has an unlocked multiplier, while the Intel Core i9-11900T does not. This means the 9900KF offers manual overclocking headroom that the 11900T lacks.

Q: How do the Cinebench R23 scores compare between the two?

A: The 11900T scores 15596 in multicore and 2201 in singlecore, while the 9900KF scores 15292 and 2158 respectively. The 11900T leads by 2% in both Cinebench R23 tests.

Where Each One Wins

The Intel Core i9-11900T is the clear choice for single-threaded and lightly-threaded workloads. Its Geekbench single-core score of 2157 is 26.4% higher than the 9900KF’s 1706, and it also takes all four Cinebench single-core tests by 2% margins. This makes it the better option for applications that rely on per-core performance, such as legacy software, certain game engines, and everyday desktop responsiveness. The 11900T also wins every Cinebench multicore test, including R23 multicore at 15596 versus 15292, so it holds an edge even in many all-core rendering scenarios.

The Intel Core i9-9900KF’s single victory in Geekbench multicore (8970 vs 8257) indicates that it has a specific strength in workloads that this particular benchmark measures. The 7.9% advantage suggests that the 9900KF’s higher base clock of 3.60 GHz and boost clock of 5.00 GHz, combined with its unlocked multiplier, allow it to sustain higher all-core frequencies under certain conditions. For users who prioritize this specific multi-threaded metric, or who plan to overclock manually, the 9900KF offers a compelling alternative.

For general productivity and mixed workloads, the data favors the 11900T due to its consistent wins across the Cinebench suite. However, the near-identical average scores mean that real-world differences will likely be small. The 11900T’s lower TDP of 35 watts versus 95 watts also makes it a superior choice for compact or thermally constrained systems, where it can deliver comparable performance with far less heat output.

Specification Differences

The two processors differ in several fundamental specifications. The Intel Core i9-11900T uses the Intel Socket 1200, while the Intel Core i9-9900KF uses the Intel Socket 1151. This means they are not interchangeable on the same motherboard. The base clock speeds are dramatically different: the 11900T runs at 1500 MHz (1.50 GHz), while the 9900KF runs at 3.60 GHz. Boost clocks are closer, with the 11900T at 4.90 GHz and the 9900KF at 5.00 GHz.

The TDP ratings show a major divergence, with the 11900T at 35 watts and the 9900KF at 95 watts. The memory bandwidth also differs, with the 11900T supporting 51.2 GB/s versus 42.7 GB/s for the 9900KF. PCIe support varies as well: the 11900T offers Gen 4 with 20 lanes (CPU only), while the 9900KF offers Gen 3 with 16 lanes. The launch MSRP also differs, with the 11900T at $439 and the 9900KF at $488.

Cache configurations are not identical. The 11900T has 80 KB of L1 cache per core and 512 KB of L2 per core, while the 9900KF has 64 KB of L1 and 256 KB of L2 per core. Both share 16 MB of L3 cache. The 11900T includes integrated graphics (UHD Graphics 750), while the 9900KF has no integrated graphics, as indicated by the "F" suffix.

Architecture Differences

The Intel Core i9-11900T is built on the Rocket Lake architecture, codenamed Rocket Lake, and belongs to the Core 11th Gen series. The Intel Core i9-9900KF uses the Coffee Lake architecture, specifically Coffee Lake-R, and is part of the Coffee Lake Refresh generation. Both are manufactured on a 14 nm process node by Intel, but the die sizes differ substantially: the 11900T has a die size of 276 mm², while the 9900KF is smaller at 180.3 mm².

The cache hierarchy differences reflect the architectural changes. The 11900T’s larger per-core L1 and L2 caches (80 KB and 512 KB respectively) versus the 9900KF’s (64 KB and 256 KB) suggest a redesigned core that improves per-thread performance. This is consistent with the 11900T’s 26.4% lead in Geekbench single-core. The memory bandwidth increase from 42.7 GB/s to 51.2 GB/s on the 11900T also points to a more capable memory controller.

Socket compatibility is a hard divider: the 11900T requires an Intel Socket 1200 board, while the 9900KF requires an Intel Socket 1151 board. The PCIe generation difference (Gen 4 on the 11900T versus Gen 3 on the 9900KF) provides the newer chip with higher bandwidth for compatible GPUs and NVMe drives. The 11900T also includes integrated UHD Graphics 750, a feature entirely absent from the 9900KF. Finally, the multiplier unlock status differs: the 9900KF is unlocked for overclocking, while the 11900T is locked, a significant consideration for enthusiasts.