AMD Ryzen 9 6900HX vs Intel Core i9-11900KF Comparison

The AMD Ryzen 9 6900HX and Intel Core i9-11900KF land in the same performance tier, with average benchmark scores of 26274 and 26212 respectively, a negligible 0.2% gap. Despite this overall parity, the head-to-head data reveals a decisive split: the Intel part wins 19 of 23 benchmark comparisons, while the AMD mobile chip takes only 4. The Intel i9-11900KF is the clear performance leader in most workloads, but the Ryzen 9 6900HX counters with specific wins that highlight its architectural efficiency.

Head-to-Head Benchmarks

The Intel Core i9-11900KF dominates multi-threaded rendering workloads. In Cinebench R23 multicore, Intel scores 20838 against AMD's 13497, a 35.2% advantage. This is the largest delta in the entire comparison and signals a substantial lead for heavy, sustained all-core loads. The 3DMark results reinforce this pattern; Intel wins the 16-thread test 8335 to 6745 (-19.1%) and the max-threads test 8322 to 6717 (-19.3%). For users running CPU-bound game physics or complex 3D simulations, this gap is decisive.

Single-thread performance also favors Intel, though by smaller margins. In Cinebench R23 single-core, Intel scores 2941 versus AMD's 1558, a 47% lead, which is the second-largest delta in the data. Geekbench single-core shows Intel ahead 2062 to 1881 (-8.8%). The 3DMark single-thread test gives Intel 1026 against 912 (-11.1%). The Intel chip also wins the 2-thread and 4-thread 3DMark tests, scoring 2005 and 3834 versus 1767 and 3353 respectively. These results indicate that the Intel part has a clear edge in lightly-threaded tasks where clock speed dominates.

The AMD Ryzen 9 6900HX's wins are narrower but concentrated in specific areas. Its best victory comes in PassMark data encryption, where it scores 19118 against Intel's 15623, a 22.4% advantage. This suggests strong cryptographic instruction throughput. AMD also wins PassMark physics with 1153 versus 1034 (11.5%), which is notable for a mobile chip. In Cinebench R15 multicore, AMD wins 2231 to 2100 (6.2%), showing that in some older rendering workloads, the AMD part holds its own. Finally, AMD edges out Intel in PassMark integer math, 89388 to 89023, a marginal 0.4% win.

Beyond these four wins, Intel takes the remaining tests with varying margins. PassMark multi-thread shows Intel ahead by only 1.5% (24708 vs 24346), indicating near-parity in general multi-threading. However, PassMark random string sorting tilts heavily toward Intel, with a 14.3% lead (37383 vs 32037). Intel also wins floating-point math (52640 vs 49981, -5.1%), extended instructions (22703 vs 20849, -8.2%), data compression (325688 vs 306184, -6%), and find prime numbers (66 vs 63, -4.5%). The single-thread PassMark score favors Intel slightly, 3527 to 3409 (-3.3%).

Architecture Differences

The two processors represent fundamentally different design philosophies and market segments. The AMD Ryzen 9 6900HX is a mobile chip built on TSMC's 6 nm process, using the Zen 3+ architecture with the Rembrandt codename. It fits the AMD Socket FP7 and has a 45 W TDP. In contrast, the Intel Core i9-11900KF is a desktop processor from the Core 11th Gen series, built on Intel's 14 nm process with the Rocket Lake architecture. It uses the Intel Socket 1200 and carries a 125 W TDP, reflecting its desktop power envelope.

Both processors have 8 cores and 16 threads, so thread counts are identical. Cache configurations differ slightly in L1: AMD provides 64 KB per core while Intel offers 80 KB per core. Both have 512 KB L2 per core and a shared 16 MB L3. The process node difference is stark—6 nm versus 14 nm—which explains the AMD chip's lower die size of 208 mm² against Intel's 276 mm². The AMD part integrates a Radeon 680M GPU, while the Intel i9-11900KF has no integrated graphics.

Memory support diverges completely. The AMD chip supports DDR5 memory with a dual-channel bus and 76.8 GB/s bandwidth. The Intel part uses DDR4 with a dual-channel bus and 51.2 GB/s bandwidth. This gives AMD a 33% theoretical memory bandwidth advantage. Both support PCIe Gen 4 with 20 lanes from the CPU. Neither supports ECC memory. The AMD multiplier is unlocked, and the Intel multiplier is also unlocked, allowing overclocking on both.

The Intel part is marked as end-of-life, with a release date of 2021-03-15 and a launch MSRP of $513. The AMD part is active in production, with a part number of 100-000000544100-000000560. The Intel part number is SRKNF. Market positioning also differs: AMD targets mobile systems while Intel targets desktop builds.

Where Each One Wins

The Intel Core i9-11900KF is the choice for users prioritizing raw multi-threaded rendering and high-frequency single-thread performance. Its 35.2% lead in Cinebench R23 multicore and 47% lead in Cinebench R23 single-core make it the superior option for video encoding, 3D rendering, and CPU-heavy productivity suites. The 3DMark results, where Intel wins every thread-count variant from 2 to 16, indicate it is also better suited for gaming workloads that rely on high core clocks and responsive thread scheduling. The PassMark wins in data compression, random string sorting, and floating-point math further cement its utility for general desktop applications and scientific computing.

The AMD Ryzen 9 6900HX wins in specific niches that may matter for specialized workflows. Its 22.4% lead in data encryption makes it preferable for security-focused tasks, database encryption, or VPN throughput. The 11.5% win in PassMark physics suggests better performance in certain simulation or physics calculation engines. The Cinebench R15 multicore win, though smaller, implies that some legacy software may run better on the AMD part. The integer math win, while marginal, shows AMD is not completely outclassed in arithmetic-heavy code.

For mobile users, the AMD chip's 45 W TDP versus Intel's 125 W TDP is a critical differentiator, even though TDP is not a benchmark score. The AMD part is designed for laptops where power and thermals are constrained. The Intel part, being a desktop chip, demands a robust cooling solution and a power supply capable of handling its higher draw.

FAQ

Q: Which CPU has a higher average benchmark score?

A: The AMD Ryzen 9 6900HX has an average benchmark score of 26274, while the Intel Core i9-11900KF scores 26212. The difference is 0.2%, with AMD technically ahead by a negligible margin.

Q: How large is the Intel lead in Cinebench R23 multicore?

A: The Intel Core i9-11900KF scores 20838 in Cinebench R23 multicore, while the AMD Ryzen 9 6900HX scores 13497. This gives Intel a 35.2% advantage in that test.

Q: Is there any benchmark where the AMD chip wins by a large margin?

A: Yes, in PassMark data encryption, the AMD Ryzen 9 6900HX scores 19118 versus Intel's 15623, a 22.4% lead for AMD.

Q: Do both CPUs have the same number of cores and threads?

A: Yes, both the AMD Ryzen 9 6900HX and the Intel Core i9-11900KF have 8 cores and 16 threads.

Q: What memory types do the two processors support?

A: The AMD Ryzen 9 6900HX supports DDR5 memory with 76.8 GB/s bandwidth. The Intel Core i9-11900KF supports DDR4 memory with 51.2 GB/s bandwidth.

Q: Which CPU has integrated graphics?

A: The AMD Ryzen 9 6900HX includes a Radeon 680M integrated GPU. The Intel Core i9-11900KF has no integrated graphics.

Specification Differences

The two processors differ in several key specification fields. The AMD Ryzen 9 6900HX has a base clock of 3.30 GHz and a boost clock of 4.90 GHz, while the Intel Core i9-11900KF has a base clock of 3.50 GHz and a boost clock of 5.30 GHz. The TDP differs significantly: AMD lists 45 W, Intel lists 125 W. Process nodes are 6 nm for AMD and 14 nm for Intel. Die size is 208 mm² for AMD and 276 mm² for Intel. L1 cache is 64 KB per core for AMD and 80 KB per core for Intel. Memory support is DDR5 for AMD and DDR4 for Intel, with memory bandwidth at 76.8 GB/s versus 51.2 GB/s. The AMD part has an integrated Radeon 680M GPU, while the Intel part has none. Market segments are Mobile for AMD and Desktop for Intel. Production status is Active for AMD and End-of-life for Intel. The Intel part has a release date of 2021-03-15 and a launch MSRP of $513; the AMD part has no listed release date or MSRP.

The Verdict

The data is unambiguous: the Intel Core i9-11900KF is the faster processor in the majority of benchmark scenarios. It wins 19 of 23 head-to-head comparisons, with particularly large margins in Cinebench R23 multicore (35.2%) and single-core (47%). Its 3DMark sweep across all thread counts, from 2-thread to 16-thread, demonstrates superior scaling and responsiveness for gaming and general desktop workloads. Users who need maximum rendering throughput, high single-thread speed, or broad application compatibility should choose the Intel part, provided they can accommodate its 125 W TDP and desktop socket.

The AMD Ryzen 9 6900HX is the better choice for two specific user profiles. First, those running encryption-heavy workloads will benefit from its 22.4% lead in data encryption. Second, mobile users who need an 8-core, 16-thread processor in a 45 W package will find the AMD chip purpose-built for laptops, whereas the Intel part is a desktop component. The AMD chip also wins in PassMark physics and Cinebench R15 multicore, but these are narrow advantages. For most tasks, the Intel i9-11900KF delivers higher performance, but the AMD Ryzen 9 6900HX offers a compelling combination of efficiency and encryption capability that the Intel chip cannot match. The choice hinges on whether raw performance or power-constrained mobility is the priority.