AMD Ryzen 5 5600X3D vs AMD Ryzen 9 6900HS Comparison

The AMD Ryzen 5 5600X3D and AMD Ryzen 9 6900HS are both 77th-percentile CPUs, but they achieve that standing through entirely different means. The 5600X3D is a desktop part with a massive cache, while the 6900HS is a mobile chip with more cores and a higher boost clock. The benchmark data reveals a clear split: the 5600X3D dominates in single-threaded and cache-sensitive workloads, while the 6900HS wins in raw throughput and math-heavy tasks. The 5600X3D wins 6 of the 17 head-to-head tests, with the 6900HS taking 11.

The Verdict

The data points to two distinct buyers. The AMD Ryzen 5 5600X3D is the pick for anyone prioritizing single-core responsiveness and physics simulation. It leads the 6900HS by 69% in Cinebench R23 single-core (2626 vs 1554), by 20.4% in Geekbench single-core (2086 vs 1733), and by a massive 212.1% in Passmark find prime numbers (181 vs 58). Its 135.6% lead in Passmark physics (2453 vs 1041) makes it the clear choice for simulation-heavy desktop workloads. It also carries a launch MSRP of $229.

The AMD Ryzen 9 6900HS is the better choice for parallel compute and data processing. It leads by 24.1% in Passmark integer math (86449 vs 65587), by 22.3% in floating point math (48239 vs 37464), and by 15.5% in data compression (292842 vs 247365). Its 8-core/16-thread configuration outperforms the 5600X3D’s 6-core/12-thread setup in Cinebench R15 multicore (2161 vs 1875, a 13.2% lead). For users who need a mobile processor with strong multi-threaded capabilities, the 6900HS is the answer.

The overall average benchmark scores are nearly identical—25365 for the 5600X3D and 25284 for the 6900HS—confirming that the choice hinges on workload, not overall capability. The 5600X3D excels where cache matters; the 6900HS excels where core count and clock speed matter.

Architecture Differences

The two CPUs come from different generations and process nodes. The 5600X3D is built on Zen 3 architecture with the Vermeer codename, fabricated on a 7 nm process at TSMC. The 6900HS uses Zen 3+ architecture with the Rembrandt codename, on a 6 nm process at the same foundry. This makes the 6900HS the more modern design, but the 5600X3D compensates with a much larger cache.

The 5600X3D has 96 MB of shared L3 cache, while the 6900HS has only 16 MB of shared L3 cache. This 6x difference in L3 is the defining architectural feature of the 5600X3D and explains its dominance in cache-sensitive benchmarks like prime number finding and physics. Both have identical L1 (64 KB per core) and L2 (512 KB per core) configurations.

The die sizes reflect their different purposes: the 5600X3D is 74 mm², while the 6900HS is 208 mm². The 6900HS integrates a Radeon 680M GPU, while the 5600X3D has no integrated graphics. The TDP difference is stark—105W for the desktop 5600X3D versus 35W for the mobile 6900HS—but this is expected given their market segments.

Head-to-Head Benchmarks

The largest win for the 5600X3D is in Passmark find prime numbers, where it scores 181 versus 58, a 212.1% advantage. This is a direct reflection of the 96 MB L3 cache. Similarly, in Passmark physics, the 5600X3D scores 2453 against 1041, a 135.6% lead. In Cinebench R23 single-core, the 5600X3D scores 2626 versus 1554, a 69% advantage, and in Geekbench single-core, it leads 2086 to 1733, a 20.4% margin. Even in Cinebench R23 multicore, the 5600X3D wins 18603 to 13445, a 38.4% lead, despite having fewer cores.

The 6900HS fights back in almost every other category. Its Passmark integer math score of 86449 beats 65587, a 24.1% lead. In floating point math, it scores 48239 versus 37464, a 22.3% margin. Passmark data encryption goes to the 6900HS at 18303 versus 15170, a 17.1% lead. Data compression favors the 6900HS at 292842 versus 247365, a 15.5% advantage. Random string sorting goes to the 6900HS at 30528 versus 24597, a 19.4% lead. Extended instructions favor the 6900HS at 20015 versus 17102, a 14.6% margin.

The closest contests are in Geekbench multicore, where the 6900HS wins 9451 to 9386, a slim 0.7% margin, and Passmark single-thread, where the 6900HS edges ahead 3237 to 3187, a 1.5% difference. The 6900HS also wins Cinebench R15 multicore 2161 to 1875, a 13.2% lead, and Passmark multithread 23152 to 21888, a 5.5% margin. The only single-core benchmark the 6900HS wins is Passmark single-thread, and only by a hair.

Specification Differences

The core difference is in core count: the 5600X3D has 6 cores and 12 threads, while the 6900HS has 8 cores and 16 threads. Base clocks are identical at 3.30 GHz, but the 6900HS boosts to 4.90 GHz versus 4.40 GHz for the 5600X3D. The TDP is 105W for the desktop part and 35W for the mobile part.

Memory support diverges significantly: the 5600X3D uses DDR4 with 51.2 GB/s bandwidth, while the 6900HS uses DDR5 with 76.8 GB/s bandwidth. The 5600X3D supports ECC memory; the 6900HS does not. Both support PCIe Gen 4 with 20 lanes. The 5600X3D uses AMD Socket AM4, while the 6900HS uses AMD Socket FP7. The 5600X3D is end-of-life, while the 6900HS is active. Neither has an unlocked multiplier.

FAQ

Q: Which CPU has better single-core performance?

A: The AMD Ryzen 5 5600X3D wins decisively. It leads by 69% in Cinebench R23 single-core (2626 vs 1554) and by 20.4% in Geekbench single-core (2086 vs 1733). The only single-core test the 6900HS wins is Passmark single-thread, by 1.5% (3237 vs 3187).

Q: Which CPU is better for multi-threaded workloads?

A: It depends on the benchmark. The 6900HS wins Cinebench R15 multicore (2161 vs 1875, a 13.2% lead) and Passmark multithread (23152 vs 21888, a 5.5% lead). However, the 5600X3D wins Cinebench R23 multicore by 38.4% (18603 vs 13445) and Geekbench multicore is nearly tied, with the 6900HS ahead by only 0.7%.

Q: Why is the 5600X3D so much faster in physics and prime number tests?

A: The 5600X3D has 96 MB of shared L3 cache versus 16 MB for the 6900HS. This translates to a 212.1% lead in Passmark find prime numbers (181 vs 58) and a 135.6% lead in Passmark physics (2453 vs 1041).

Q: Which CPU has higher memory bandwidth?

A: The AMD Ryzen 9 6900HS supports DDR5 memory and has a memory bandwidth of 76.8 GB/s. The AMD Ryzen 5 5600X3D supports DDR4 with a bandwidth of 51.2 GB/s.

Q: What is the TDP difference?

A: The 5600X3D has a TDP of 105W, while the 6900HS has a TDP of 35W. This reflects the desktop versus mobile market segmentation.

Q: Which CPU has integrated graphics?

A: Only the AMD Ryzen 9 6900HS has integrated graphics, in the form of a Radeon 680M. The AMD Ryzen 5 5600X3D has no integrated graphics.