AMD Ryzen 9 5980HS vs Intel Core i7-6900K Comparison

FAQ

Q: Which processor has the higher boost clock speed?

A: The AMD Ryzen 9 5980HS boosts to 4.80 GHz, while the Intel Core i7-6900K reaches 3.70 GHz. The AMD part holds a substantial clock advantage in single-threaded burst workloads.

Q: How do their memory channels differ?

A: The AMD Ryzen 9 5980HS uses dual-channel DDR4 with 68.3 GB/s bandwidth, whereas the Intel Core i7-6900K supports quad-channel DDR4 with 76.8 GB/s. The Intel chip provides higher theoretical memory throughput.

Q: Which processor is built on a smaller manufacturing process?

A: The AMD Ryzen 9 5980HS uses a 7 nm process at TSMC, while the Intel Core i7-6900K is fabricated on Intel's 14 nm node. The smaller node contributes to the AMD chip's lower power envelope.

Q: What is the thermal design power difference?

A: The AMD Ryzen 9 5980HS has a TDP of 35 watts, compared to 140 watts for the Intel Core i7-6900K. This makes the AMD part far more efficient for mobile systems.

Q: Which processor wins the Cinebench R23 multi-core test?

A: The AMD Ryzen 9 5980HS scores 12,629 versus 12,444 for the Intel Core i7-6900K, a 1.5% advantage. The margin is narrow, indicating near-parity in heavily threaded workloads.

Q: Does the Intel chip have integrated graphics?

A: No, the Intel Core i7-6900K has no integrated graphics. The AMD Ryzen 9 5980HS includes Radeon Vega 8 graphics, making it suitable for systems without a discrete GPU.

Where Each One Wins

The benchmark split favors the AMD Ryzen 9 5980HS in three of the four head-to-head comparisons, but the nature of those wins matters more than the count. In Cinebench R15 multi-core, the AMD chip scores 2,083 versus 1,254 for the Intel part, a 66.1% advantage. That is a massive gap in an older renderer that responds well to higher per-core efficiency and memory bandwidth. Similarly, in Cinebench R15 single-core, the AMD processor leads 243 to 176, a 38.1% margin, showing its Zen 3 architecture delivers far stronger single-thread performance than the older Broadwell design.

The Cinebench R23 multi-core test tells a different story. The AMD Ryzen 9 5980HS scores 12,629, only 1.5% ahead of the Intel Core i7-6900K's 12,444. This near-tie suggests that in modern, heavily threaded workloads, the two processors are effectively equivalent, despite their vastly different power budgets and release dates. The Intel chip's quad-channel memory and larger 20 MB L3 cache help it close the gap that the older R15 test reveals.

The single clear win for the Intel Core i7-6900K comes in Cinebench R23 single-core, where it scores 1,756 against the AMD's 1,529, a 12.9% advantage. This is an unusual result given the AMD chip's higher boost clock and newer architecture, but the recorded data shows the Intel part performs better in this specific test. For users running applications that rely on single-threaded Cinebench R23 performance, the Intel chip has a measurable edge.

In practical terms, the AMD Ryzen 9 5980HS is the better choice for older rendering workloads and any task that benefits from high single-thread speed in legacy benchmarks. The Intel Core i7-6900K holds its own in modern multi-threaded rendering and actually wins in one single-core scenario. The AMD part also offers integrated graphics, which the Intel chip lacks entirely, making it more versatile for compact builds or troubleshooting without a discrete GPU.

Architecture Differences

The AMD Ryzen 9 5980HS is built on Zen 3 architecture with the codename Cezanne, fabricated on a 7 nm process at TSMC. It uses 10,700 million transistors on a 180 mm² die. The Intel Core i7-6900K belongs to the Broadwell family, specifically Broadwell-E, on Intel's 14 nm process with 3,400 million transistors and a 246 mm² die. The transistor count difference is stark: the AMD chip packs over three times as many transistors into a smaller area, which explains its superior efficiency and per-clock performance.

Cache hierarchies differ notably. Both processors have 64 KB of L1 per core, but the AMD chip uses 512 KB of L2 per core versus 256 KB on the Intel part. L3 cache is 16 MB shared on the AMD Ryzen 9 5980HS, while the Intel Core i7-6900K has 20 MB shared. The larger L3 on Intel helps in certain workloads, particularly those with large working sets, but the AMD chip's larger per-core L2 compensates in latency-sensitive tasks.

The integrated graphics situation is a major architectural divergence. The AMD Ryzen 9 5980HS includes Radeon Vega 8, while the Intel Core i7-6900K has no integrated GPU. This makes the AMD part a complete APU solution, whereas the Intel chip requires a discrete graphics card for any display output. For embedded or minimal builds, this is a deciding factor.

Memory architecture also differs. The AMD chip uses dual-channel DDR4 with 68.3 GB/s bandwidth, while the Intel part supports quad-channel DDR4 with 76.8 GB/s. The Intel chip's wider memory bus gives it higher peak bandwidth, which likely contributes to its competitive Cinebench R23 multi-core score despite its older architecture. PCIe connectivity favors Intel as well: the Intel Core i7-6900K provides Gen 3 with 40 lanes, while the AMD Ryzen 9 5980HS offers Gen 3 with 16 lanes.

The production status tells the lifecycle story. The AMD Ryzen 9 5980HS is listed as active, released in January 2021. The Intel Core i7-6900K is end-of-life, released in May 2016. This five-year gap explains the architectural differences: Zen 3 is a modern design, while Broadwell-E represents a high-end desktop platform from the previous generation.

Specification Differences

The AMD Ryzen 9 5980HS and Intel Core i7-6900K share the same core and thread counts, 8 cores and 16 threads, but diverge significantly elsewhere. The AMD chip has a base clock of 3.00 GHz and boost clock of 4.80 GHz, while the Intel part runs at 3.20 GHz base and 3.70 GHz boost. The AMD chip's higher boost clock gives it a clear frequency advantage in single-threaded bursts.

TDP is the most striking difference: 35 watts for the AMD Ryzen 9 5980HS versus 140 watts for the Intel Core i7-6900K. The AMD processor consumes a fraction of the power while delivering comparable or better performance in most tests. This makes the AMD part suitable for thin-and-light laptops, while the Intel chip demands a high-end desktop cooling solution.

Sockets and platforms are entirely different. The AMD Ryzen 9 5980HS uses AMD Socket FP6, a mobile socket, while the Intel Core i7-6900K uses Intel Socket 2011-3, a desktop HEDT platform. The Intel chip has an unlocked multiplier for overclocking, while the AMD part is locked. The Intel Core i7-6900K has a launch MSRP of $1089, reflecting its original high-end desktop positioning.

Memory support is identical in type (DDR4), but the bus configuration differs: dual-channel for AMD versus quad-channel for Intel. The AMD chip has integrated Radeon Vega 8 graphics, the Intel chip has none. Production status also differs: the AMD part is active, the Intel part is end-of-life. The Intel chip's part number is SR2PB, while the AMD chip's is 100-000000474.

Head-to-Head Benchmarks

The Cinebench R15 multi-core test delivers the largest victory in this comparison. The AMD Ryzen 9 5980HS scores 2,083, beating the Intel Core i7-6900K's 1,254 by 66.1%. This is a dominant result, showing that in this older benchmark, the AMD chip's architecture and clock speed translate into a massive multi-threaded advantage. The Intel part's quad-channel memory cannot compensate for its lower boost clock and older core design.

Cinebench R15 single-core shows a similar but smaller gap. The AMD Ryzen 9 5980HS scores 243, while the Intel Core i7-6900K manages 176, a 38.1% difference. This aligns with the boost clock disparity: 4.80 GHz versus 3.70 GHz. Single-threaded performance is critical for many legacy applications, and the AMD chip clearly wins this category.

Moving to Cinebench R23 multi-core, the margin nearly vanishes. The AMD Ryzen 9 5980HS scores 12,629, and the Intel Core i7-6900K scores 12,444, a mere 1.5% difference. This suggests that modern rendering workloads scale better with the Intel chip's larger L3 cache and higher memory bandwidth, allowing it to nearly match a processor released five years later with a fraction of the power draw.

The Intel Core i7-6900K takes its only head-to-head victory in Cinebench R23 single-core, scoring 1,756 against the AMD Ryzen 9 5980HS's 1,529. That is a 12.9% win for Intel. This result is counterintuitive given the AMD chip's higher boost clock, but the recorded data is clear. Users who rely on this specific benchmark for single-threaded tuning might prefer the Intel part.

The overall head-to-head record is 3 wins for the AMD Ryzen 9 5980HS and 1 win for the Intel Core i7-6900K. However, the magnitude of the AMD wins in R15 is far larger than the Intel win in R23 single-core. The AMD chip's 66.1% and 38.1% victories are decisive, while the Intel win is a moderate 12.9%.

The Verdict

Choose the AMD Ryzen 9 5980HS if you prioritize efficiency, integrated graphics, and strong performance in legacy single-threaded and multi-threaded workloads. Its 35 watt TDP makes it ideal for mobile systems, and the Radeon Vega 8 graphics remove the need for a discrete GPU in basic builds. The 66.1% lead in Cinebench R15 multi-core and 38.1% lead in R15 single-core show that for older software, the AMD chip is far superior. Even in modern Cinebench R23 multi-core, it edges ahead by 1.5%, so there is no meaningful multi-threaded penalty for choosing the newer part.

Choose the Intel Core i7-6900K if you need quad-channel memory bandwidth, 40 PCIe lanes, or an unlocked multiplier for overclocking. Its 76.8 GB/s memory bandwidth and larger 20 MB L3 cache make it competitive in Cinebench R23 multi-core, where it trails by only 1.5%. The 12.9% win in Cinebench R23 single-core is a genuine advantage for that specific workload. The Intel chip also supports overclocking, which can extend its performance beyond stock settings, though the database does not quantify the potential gains.

For most users, the AMD Ryzen 9 5980HS is the more sensible choice. It matches the Intel chip in modern multi-threaded rendering, crushes it in older benchmarks, uses a fraction of the power, includes integrated graphics, and is still in production. The Intel Core i7-6900K is an end-of-life desktop part from 2016 that only makes sense for those with specific platform requirements, such as existing Socket 2011-3 motherboards or a need for quad-channel memory. The data shows a clear generational shift: the AMD part delivers comparable or better performance with dramatically lower power consumption, making it the practical pick for new builds.