AMD Ryzen 5 6600H vs AMD Ryzen 5 8540U Comparison

The Verdict

The recorded benchmark data splits these two mobile processors nearly evenly, with the AMD Ryzen 5 6600H taking 8 of the 15 head-to-head tests and the AMD Ryzen 5 8540U taking 7. The overall average benchmark scores sit very close: the 8540U records 26187 against the 6600H's 25550, a difference of roughly 2.5%. Both parts land in the 78th percentile of all CPUs in the database, meaning they occupy the same performance tier despite their architectural differences.

For users prioritizing sustained multi-threaded workloads, the Ryzen 5 6600H is the stronger choice. It wins the two Cinebench multi-core tests and the majority of PassMark compute tasks, with its largest margins appearing in integer math and data encryption. The Ryzen 5 8540U, however, is clearly superior in single-threaded responsiveness. It leads by 17.6% in Cinebench R23 single-core and by 14.5% in PassMark single-thread. It also dominates the prime number finding test, which suggests strong branch prediction and scalar execution efficiency.

The decision comes down to workload direction. If the target is compile jobs, video encoding, or any fully parallel throughput, the 6600H's higher base clock and larger L2 cache per core deliver measurable wins. If the target is interactive use, light gaming, or latency-sensitive applications, the 8540U's Zen 4 architecture and higher boost clock provide a clear edge. The 8540U also consumes less power on paper, with a 28 W TDP versus 45 W for the 6600H, which matters for thin-and-light designs even though this database does not measure real-world wattage.

Architecture Differences

The two chips represent different generations of AMD mobile silicon. The Ryzen 5 8540U is built on the Zen 4 architecture with the Hawk Point codename, manufactured on a 4 nm process at TSMC. The Ryzen 5 6600H uses the older Zen 3+ architecture with the Rembrandt codename, on a 6 nm process, also from TSMC. This node difference explains part of the efficiency and clock behavior, though the database does not report power measurements.

Both CPUs have 6 cores and 12 threads, so the thread count is identical. The cache hierarchy differs in one key area: the 8540U provides 1 MB of L2 cache per core, while the 6600H provides 512 KB per core. L1 cache is the same at 64 KB per core, and both share 16 MB of L3 cache. The larger L2 on the 8540U likely contributes to its strong single-thread scores, while the 6600H's higher base clock compensates in multi-threaded workloads.

The process node also affects die size. The 8540U measures 137 mm², while the 6600H is considerably larger at 208 mm². The 8540U has 20,900 million transistors, a figure not recorded for the 6600H. The 8540U supports up to 89.6 GB/s of memory bandwidth versus 76.8 GB/s for the 6600H, both on DDR5 dual-channel. PCIe connectivity differs as well: the 8540U provides 14 CPU-only Gen 4 lanes, while the 6600H provides 20.

Integrated graphics also differ. The 8540U carries the Radeon 740M, while the 6600H has the Radeon 660M. The database does not include iGPU benchmarks, so no direct comparison can be made on that front. Both use the AMD Socket FP7 and are not multiplier-unlocked. The 8540U lists a release date of December 2023, while the 6600H has no recorded release date.

Where Each One Wins

The Ryzen 5 8540U wins exclusively in single-threaded and latency-sensitive categories. Its Cinebench R23 single-core score of 1714.5 beats the 6600H's 1458 by 17.6%. The PassMark single-thread test shows 3639 versus 3178, a 14.5% advantage. The physics test, which often reflects short-burst calculation speed, goes to the 8540U at 1028 versus 891, a 15.4% margin. Random string sorting also favors the 8540U, 24375 versus 23888, a smaller 2% edge. The prime number finding test is the largest single win: 69 versus 52, a 32.7% gap. These wins point to workloads with tight loops, pointer chasing, and branch-heavy code.

The Ryzen 5 6600H wins in sustained parallel throughput. Its Cinebench R15 multi-core score is 1681.5 versus 1557.5, a 7.4% lead. Cinebench R23 multi-core shows 10322 versus 9721.5, a 5.8% gap. PassMark integer math is 64927 versus 57755, an 11% lead. Data encryption goes 14277 versus 12245, a 14.2% lead. Data compression is 229879 versus 208619, a 9.2% gap. Floating point math is 36796 versus 34958, a 5% lead. Extended instructions show 15903 versus 14900, a 6.3% edge. The multithread aggregate is 18669 versus 18332, a narrow 1.8% win. These results suggest the 6600H's higher base clock of 3.30 GHz versus 3.20 GHz, combined with its larger die and older architecture, sustains throughput better when all cores are active.

FAQ

Q: Which CPU has the higher boost clock?

A: The Ryzen 5 8540U boosts to 4.90 GHz, while the Ryzen 5 6600H boosts to 4.50 GHz. The 8540U also wins the single-thread Cinebench R23 test by 17.6%.

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

A: Yes, both have 6 cores and 12 threads. They differ in L2 cache size: 1 MB per core for the 8540U versus 512 KB per core for the 6600H.

Q: Which chip is better for multi-core rendering?

A: The Ryzen 5 6600H. It wins Cinebench R23 multi-core with 10322 versus 9721.5, a 5.8% lead, and also wins Cinebench R15 multi-core by 7.4%.

Q: What is the memory bandwidth difference?

A: The 8540U supports 89.6 GB/s, while the 6600H supports 76.8 GB/s. Both use dual-channel DDR5.

Q: Which processor has the higher TDP?

A: The 6600H has a 45 W TDP, while the 8540U has a 28 W TDP. The database does not measure actual power draw.

Q: How do their overall average benchmark scores compare?

A: The 8540U averages 26187, and the 6600H averages 25550. Both sit at the 78th percentile against all CPUs in the database.

Head-to-Head Benchmarks

The largest win for the Ryzen 5 8540U comes in the PassMark find prime numbers test. The 8540U scores 69 versus 52 for the 6600H, a 32.7% advantage. This is a clean demonstration of the Zen 4 core's scalar efficiency. The Cinebench R23 single-core test also shows a substantial gap: 1714.5 versus 1458, a 17.6% lead. PassMark single-thread confirms the trend at 3639 versus 3178, a 14.5% margin. The physics test follows at 1028 versus 891, a 15.4% win. These four wins cluster around single-threaded execution and short-burst compute.

The Ryzen 5 6600H's biggest win is the PassMark data encryption test. It scores 14277 versus 12245, a 14.2% lead. The integer math test shows 64927 versus 57755, an 11% gap. Data compression goes 229879 versus 208619, a 9.2% advantage. The Cinebench R15 multi-core test shows 1681.5 versus 1557.5, a 7.4% lead. Extended instructions go 15903 versus 14900, a 6.3% edge. Cinebench R23 multi-core is 10322 versus 9721.5, a 5.8% lead. Floating point math is 36796 versus 34958, a 5% difference. The multithread aggregate is close: 18669 versus 18332, only a 1.8% gap.

The narrowest wins on the 8540U side are the random string sorting test at 2% (24375 versus 23888) and the Cinebench R15 single-core test at 8.1% (253 versus 234). The narrowest 6600H win is the multithread test at 1.8%. The overall win count is 8 for the 6600H and 7 for the 8540U, but the 8540U's average benchmark score is higher at 26187 versus 25550. This suggests the 8540U's wins are in heavier-weighted categories or that its single-thread dominance compensates for the 6600H's broader but smaller multi-core leads.

Specification Differences

The two processors differ in several recorded specification fields. The 8540U belongs to the 8000 series with the Hawk Point codename and Zen 4 architecture. The 6600H belongs to the 6000 series with the Rembrandt codename and Zen 3+ architecture. The process node is 4 nm for the 8540U and 6 nm for the 6600H, both from TSMC. Die size is 137 mm² for the 8540U and 208 mm² for the 6600H. The 8540U records 20,900 million transistors; the 6600H has no transistor count listed.

Base clocks differ: the 8540U runs at 3.20 GHz, the 6600H at 3.30 GHz. Boost clocks differ more significantly: 4.90 GHz for the 8540U versus 4.50 GHz for the 6600H. TDP is 28 W for the 8540U and 45 W for the 6600H. L2 cache per core is 1 MB for the 8540U and 512 KB for the 6600H. L1 cache per core is identical at 64 KB, and L3 cache is identical at 16 MB shared. Memory bandwidth is 89.6 GB/s for the 8540U and 76.8 GB/s for the 6600H. PCIe lane counts differ: 14 CPU-only lanes for the 8540U versus 20 for the 6600H, both Gen 4.

Integrated graphics differ: the 8540U has the Radeon 740M, the 6600H has the Radeon 660M. Both use the AMD Socket FP7, both are mobile segment parts, both are active in production, both have ECC disabled, and both are locked multipliers. The 8540U has a recorded release date of December 2023; the 6600H has none. The 8540U lists two part numbers, the 6600H lists two as well. Neither has a recorded launch MSRP.