AMD Ryzen 5 8540U vs Intel Core i9-11900KF Comparison

The Intel Core i9-11900KF and AMD Ryzen 5 8540U occupy nearly identical positions in the aggregate performance hierarchy, with average benchmark scores of 26212 and 26187 respectively—a gap of just 0.1% in favor of the Intel part. Both processors sit at the 78th percentile among all CPUs, placing them in the same competitive tier despite their radically different designs. The head-to-head benchmark data, however, tells a far more lopsided story than the aggregate scores suggest, with the Intel processor winning 12 of the 15 direct comparisons, often by substantial margins.

Head-to-Head Benchmarks

The most dramatic divergence appears in multi-core rendering workloads. In Cinebench R23 multi-core, the Intel Core i9-11900KF scores 20838 against the Ryzen 5 8540U's 9721.5, a staggering 114.3% advantage. This is not a marginal win but a doubling of performance in a heavily threaded workload. The Cinebench R15 multi-core test shows a similar pattern, with Intel leading 2100 to 1557.5, a 34.8% margin. Interestingly, the gap narrows considerably in the older R15 test, suggesting the newer R23 benchmark amplifies the Intel chip's multi-threaded advantage through longer sustained loads.

Single-core performance also favors Intel decisively. In Cinebench R23 single-core, the i9-11900KF posts 2941 versus the Ryzen's 1714.5, a 71.5% lead. The R15 single-core test shows a smaller but still significant 17% advantage (296 vs 253). This pattern indicates that Intel's Rocket Lake architecture, despite its older 14 nm process, delivers superior per-thread execution in these rendering workloads. The PassMark single-thread tests, however, flip the script: the Ryzen 5 8540U wins both passmark_single_thread and passmark_singlethread with scores of 3639 against Intel's 3527, a 3.1% advantage. This discrepancy between Cinebench and PassMark single-thread results suggests the two architectures handle different instruction mixes with varying efficiency.

In integer and floating-point math, Intel's dominance continues. PassMark integer math shows Intel at 89023 versus AMD's 57755, a 54.1% lead. Floating-point math follows suit with Intel at 52640 against 34958, a 50.6% margin. Data compression and encryption workloads also favor Intel heavily: compression scores 325688 vs 208619 (56.1% ahead), while encryption shows 15623 vs 12245 (27.6% ahead). Extended instruction performance is another Intel stronghold, with 22703 versus 14900, a 52.4% advantage. Random string sorting, a memory-latency-sensitive workload, shows Intel ahead by 53.4% (37383 vs 24375).

The AMD Ryzen 5 8540U claims only three wins, all in PassMark tests. Beyond the single-thread victories, it wins passmark_find_prime_numbers with a score of 69 against Intel's 66, a 4.3% edge. The physics test is essentially a tie, with Intel at 1034 and AMD at 1028, a 0.6% margin that rounds to a statistical dead heat. This narrow spread underscores that the Ryzen's wins are confined to specific algorithmic patterns rather than broad architectural superiority.

Where Each One Wins

The Intel Core i9-11900KF is the clear choice for compute-heavy, multi-threaded workloads. Its 114.3% lead in Cinebench R23 multi-core makes it the obvious pick for 3D rendering, video encoding, and any task that scales with core count. The 8-core, 16-thread configuration with a 5.30 GHz boost clock provides substantial parallel throughput that the 6-core, 12-thread Ryzen cannot match in sustained workloads. The Intel chip's 56.1% advantage in data compression and 54.1% lead in integer math also make it suited for database operations, file archiving, and scientific computing that relies on integer arithmetic.

For single-threaded productivity, Intel again takes the crown in Cinebench, with a 71.5% R23 single-core lead. This translates to faster response in lightly threaded applications like legacy office suites, some CAD tools, and general desktop responsiveness. The Intel part's 17% Cinebench R15 single-core advantage reinforces this pattern.

The AMD Ryzen 5 8540U wins in specific PassMark workloads that likely favor its Zen 4 architecture's efficiency. The 3.1% lead in PassMark single-thread and the 4.3% edge in prime number finding suggest AMD's newer architecture handles these particular algorithms more gracefully. The 28 W TDP versus Intel's 125 W TDP means the Ryzen achieves this performance at a fraction of the power draw, making it the appropriate choice for thermally constrained mobile environments. The integrated Radeon 740M graphics on the AMD part also provide display output capability that the Intel desktop chip lacks entirely.

Architecture Differences

The two processors represent fundamentally different design philosophies separated by two generations of process technology. The Intel Core i9-11900KF uses Rocket Lake architecture on Intel's 14 nm process, with a die size of 276 mm². It packs 8 cores and 16 threads, with 80 KB of L1 cache per core, 512 KB of L2 per core, and 16 MB of shared L3 cache. The AMD Ryzen 5 8540U uses Zen 4 architecture on TSMC's 4 nm process, with a significantly smaller 137 mm² die containing 20,900 million transistors. It offers 6 cores and 12 threads, with 64 KB of L1 per core, 1 MB of L2 per core, and the same 16 MB shared L3 cache.

Memory support diverges sharply. The Intel chip uses DDR4 with dual-channel memory and a bandwidth of 51.2 GB/s, while the AMD part supports DDR5 with dual-channel memory and a substantially higher 89.6 GB/s bandwidth. This 75% difference in theoretical memory bandwidth does not translate into benchmark wins for AMD in the tested workloads, suggesting that the Intel chip's cache hierarchy and core design compensate for the slower memory interface. PCIe connectivity also differs: Intel provides Gen 4 with 20 CPU lanes, while AMD offers Gen 4 with 14 CPU lanes.

The platform context could not be more different. Intel targets the desktop Socket 1200 with a 125 W TDP, unlocked multiplier, and a launch MSRP of $513. The AMD chip is a mobile part on Socket FP7 with a 28 W TDP and a locked multiplier. The Intel processor is end-of-life with a March 2021 release date, while the AMD chip is active production with a December 2023 launch. These are not competing products in the traditional sense—one is a power-hungry desktop flagship, the other an efficient mobile processor—yet their aggregate benchmark scores place them in the same performance neighborhood.

The Verdict

The data makes one thing clear: if raw performance is the only criterion, the Intel Core i9-11900KF wins decisively. It leads in 12 of 15 head-to-head benchmarks, often by margins exceeding 50%. In Cinebench R23 multi-core, it delivers more than double the Ryzen's score. For anyone building a desktop system where power consumption is irrelevant and maximum compute throughput is paramount, the Intel part is the data-backed choice.

The AMD Ryzen 5 8540U's case rests on context rather than raw numbers. Its 28 W TDP against Intel's 125 W TDP represents a power efficiency advantage of roughly 4.5 times, though the exact wattage difference is not directly benchmarked. The integrated Radeon 740M graphics eliminate the need for a discrete GPU in basic systems. The DDR5 memory support and 89.6 GB/s bandwidth provide a modern platform foundation. The 4 nm process with 20,900 million transistors in a 137 mm² die demonstrates architectural efficiency that the 14 nm Intel chip cannot match.

The aggregate scores show these chips are near-identical in overall capability—0.1% apart—but that statistical tie masks the reality that they achieve parity through very different means. Intel wins through brute-force core count and clock speed; AMD wins through architectural efficiency and platform modernity. The Ryzen 5 8540U is the rational choice for mobile systems where battery life and thermals matter more than peak performance. The i9-11900KF is the correct pick for a desktop workstation where the 125 W power draw is acceptable and the 5.30 GHz boost clock delivers results.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Core i9-11900KF has an average benchmark score of 26212, while the AMD Ryzen 5 8540U scores 26187. This represents a 0.1% difference in favor of Intel.

Q: How much faster is the Intel chip in Cinebench R23 multi-core?

A: The Intel Core i9-11900KF scores 20838 in Cinebench R23 multi-core versus 9721.5 for the AMD Ryzen 5 8540U, giving Intel a 114.3% advantage.

Q: Are there any benchmarks where the AMD Ryzen 5 8540U wins?

A: Yes, the AMD chip wins 3 of 15 head-to-head tests: passmark_single_thread (3639 vs 3527, a 3.1% lead), passmark_singlethread (same scores), and passmark_find_prime_numbers (69 vs 66, a 4.3% lead).

Q: What are the core and thread counts for each processor?

A: The Intel Core i9-11900KF has 8 cores and 16 threads. The AMD Ryzen 5 8540U has 6 cores and 12 threads.

Q: What memory types do these processors support?

A: The Intel Core i9-11900KF supports DDR4 memory with dual-channel configuration and 51.2 GB/s bandwidth. The AMD Ryzen 5 8540U supports DDR5 memory with dual-channel configuration and 89.6 GB/s bandwidth.

Q: What is the production status of each processor?

A: The Intel Core i9-11900KF is end-of-life, having been released on March 15, 2021. The AMD Ryzen 5 8540U is active production, released on December 5, 2023.