AMD Ryzen 9 5900HS vs Intel Core i7-6900K Comparison

The Intel Core i7-6900K and AMD Ryzen 9 5900HS occupy opposite ends of the hardware spectrum: one is a 140W desktop flagship from 2016, the other a 35W mobile part from 2021. Yet the benchmark data reveals a surprisingly competitive matchup, with the modern AMD chip winning three of four head-to-head tests, while the older Intel part clings to a single but significant victory. The average benchmark scores are nearly identical—3970 for Intel versus 3924 for AMD—placing both within the 56th and 57th percentiles of all CPUs, respectively. The real story lies in how each processor achieves its performance, and where the architectural age gap shows most clearly.

Head-to-Head Benchmarks

The most decisive result comes from Cinebench R15 multi-core, where the Ryzen 9 5900HS scores 2041 against the Core i7-6900K’s 1254. That is a 38.6% deficit for the Intel part, a massive gap that cannot be explained by core count alone, since both chips feature 8 cores and 16 threads. The single-core R15 test tells a similar story: AMD leads with 236.5 versus 176, a 25.6% advantage. These two results paint a picture of generational superiority—the Zen 3 architecture simply executes more instructions per clock, and its higher 4.60 GHz boost clock crushes the 6900K’s 3.70 GHz ceiling.

However, the gap narrows dramatically in newer, more demanding workloads. In Cinebench R23 multi-core, the Ryzen 9 5900HS scores 12745.5, edging out the Intel chip’s 12444 by just 2.4%. This suggests that the 6900K’s older Broadwell architecture can still hold its own when all cores are fully saturated over a longer duration, likely benefiting from its 140W power budget and 20 MB of shared L3 cache. The Intel part’s 14 nm process and 3,400 million transistors are less efficient, but the sheer thermal headroom of a desktop socket allows it to sustain high clocks where the mobile chip might throttle.

The single most interesting result is Cinebench R23 single-core, where the Intel Core i7-6900K wins decisively with 1756 versus AMD’s 1475.5—a 19% margin. This is counterintuitive given the Ryzen’s superior R15 single-core score, but the data is unambiguous. The 6900K’s boost behavior in this specific test appears to hit a sweet spot, possibly due to the older chip’s ability to run at full multiplier without power limits, whereas the 5900HS’s 35W TDP constrains its sustained single-thread performance in longer workloads. This single win is the Intel chip’s only saving grace in the head-to-head, but it is a meaningful one for certain applications.

Where Each One Wins

The AMD Ryzen 9 5900HS is the clear winner for multi-threaded productivity and modern single-threaded tasks. Its R15 multi-core score of 2041 is 62.8% higher than the Intel’s 1254, making it the better choice for video rendering, compilation, or any workload that scales across cores. The R15 single-core result (236.5 vs 176) also favors AMD, indicating snappier responsiveness in everyday applications and legacy software that relies on single-thread performance. The 5900HS also brings integrated Radeon Vega 8 graphics, so it can drive a display without a discrete GPU, a feature the 6900K lacks entirely.

The Intel Core i7-6900K wins in one specific but important area: sustained single-thread performance in Cinebench R23. Its 1756 score versus 1475.5 for AMD represents a 19% advantage that could matter for applications with heavy single-threaded loops that run for minutes, not seconds. Additionally, the 6900K offers quad-channel DDR4 memory, providing 76.8 GB/s of bandwidth versus the Ryzen’s dual-channel 68.3 GB/s. That extra memory throughput benefits memory-intensive workloads, even if the CPU compute is slower overall. The Intel part also supports 40 PCIe Gen 3 lanes from the CPU, versus an unspecified count on the AMD mobile chip, making it more suitable for multi-GPU systems or high-bandwidth storage arrays.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Core i7-6900K has an average benchmark score of 3970, slightly ahead of the AMD Ryzen 9 5900HS’s 3924. The difference is just 1.2%, and both chips rank near the 56th-57th percentile of all CPUs.

Q: Is the Ryzen 9 5900HS faster in single-core performance?

A: It depends on the test. In Cinebench R15 single-core, the Ryzen 9 5900HS leads with 236.5 versus 176 for Intel, a 25.6% margin. But in Cinebench R23 single-core, the Intel Core i7-6900K wins with 1756 versus 1475.5, a 19% advantage.

Q: Do both processors have the same core and thread counts?

A: Yes, both the Intel Core i7-6900K and AMD Ryzen 9 5900HS feature 8 cores and 16 threads. Their performance differences come from architecture, clock speeds, and power limits, not core count.

Q: Which CPU has a higher boost clock?

A: The AMD Ryzen 9 5900HS boosts to 4.60 GHz, significantly higher than the Intel Core i7-6900K’s 3.70 GHz. The base clocks are closer: 3.00 GHz for AMD and 3.20 GHz for Intel.

Q: What is the memory bandwidth difference?

A: The Intel Core i7-6900K supports quad-channel DDR4 memory, delivering 76.8 GB/s of bandwidth. The AMD Ryzen 9 5900HS uses dual-channel memory, providing 68.3 GB/s—about 11% less.

Q: Does the Intel chip have integrated graphics?

A: No, the Intel Core i7-6900K has no integrated graphics. The AMD Ryzen 9 5900HS includes Radeon Vega 8, allowing it to function without a discrete GPU.

Specification Differences

The most obvious difference is TDP: the Intel Core i7-6900K draws 140W, while the AMD Ryzen 9 5900HS is rated at just 35W. This reflects their market segments—desktop versus mobile—and explains why the AMD chip can operate in thin laptops. The Intel part uses the Socket 2011-3 platform, while AMD uses Socket FP6. Clock speeds differ substantially: Intel runs at 3.20 GHz base and 3.70 GHz boost, while AMD runs at 3.00 GHz base and 4.60 GHz boost. The 6900K has a 20 MB shared L3 cache, versus 16 MB on the 5900HS, but the AMD chip has larger L2 cache per core (512 KB vs 256 KB). Memory support is quad-channel on Intel and dual-channel on AMD, with bandwidth of 76.8 GB/s versus 68.3 GB/s. PCIe support is Gen 3 with 40 lanes on the Intel CPU, while AMD lists only Gen 3 without a lane count. The Intel part has an unlocked multiplier, while the AMD chip is locked. Finally, the 6900K has a launch MSRP of $1089, while the 5900HS has no listed launch MSRP.

Architecture Differences

These chips come from different eras and foundries. The Intel Core i7-6900K is built on Intel’s 14 nm process, with 3,400 million transistors on a 246 mm² die. The AMD Ryzen 9 5900HS uses TSMC’s 7 nm process, packing 10,700 million transistors into a 180 mm² die. This density difference is stark: AMD fits more than three times the transistors into a smaller area. The Intel architecture is Broadwell-E, released in 2016, while AMD uses Zen 3 (Cezanne), released in 2021. The generation gap is evident in the L2 cache: Intel provides 256 KB per core, while AMD provides 512 KB per core. L3 cache is larger on Intel (20 MB shared) versus AMD (16 MB shared), but the AMD chip’s faster clocks and newer instruction pipeline compensate. The 5900HS integrates Radeon Vega 8 graphics, which the 6900K lacks entirely. Intel’s production status is end-of-life, while AMD’s is active. The Intel chip has 40 PCIe Gen 3 lanes from the CPU, while AMD lists only Gen 3 support without a lane count, and the Intel part’s memory bandwidth advantage (76.8 GB/s vs 68.3 GB/s) comes from its quad-channel memory controller.

The Verdict

The data supports a clear split based on use case. The AMD Ryzen 9 5900HS is the better all-round performer, winning three of four head-to-head benchmarks and delivering a 38.6% multi-core advantage in Cinebench R15. Its 4.60 GHz boost clock and 7 nm Zen 3 architecture make it the obvious choice for modern workloads, especially in mobile or low-power systems. The 35W TDP means it can deliver near-desktop performance in a laptop chassis, and the integrated Radeon Vega 8 graphics remove the need for a discrete GPU in basic systems.

The Intel Core i7-6900K should be chosen by anyone who specifically needs quad-channel memory bandwidth (76.8 GB/s) or the 40 PCIe lanes for expansion. Its Cinebench R23 single-core win (1756 vs 1475.5) also makes it relevant for long-running single-threaded tasks that outlast the AMD chip’s sustained boost. But the 140W TDP, end-of-life status, and 2016 release date mean it requires a beefy cooling solution and offers no upgrade path. For new builds, the Ryzen 9 5900HS’s active production status and superior benchmark results make it the safer recommendation, despite its lower average score (3924 vs 3970). The 6900K’s single victory in R23 single-core is notable, but it cannot overcome AMD’s sweeping wins in R15 multi-core and single-core, nor the 2.4% edge in R23 multi-core. The verdict is straightforward: buy the AMD chip for performance, buy the Intel chip only if you need its specific platform features.