AMD Ryzen 3 3100U vs Intel Atom x7405C Comparison

Head-to-Head Benchmarks

The benchmark data presents a remarkably one-sided picture. Across the eleven recorded head-to-head PassMark tests, the Intel Atom x7405C wins every single one. The AMD Ryzen 3 3100U does not secure a single victory, with the Intel part leading by margins ranging from a modest 5% to a dominant 50.7%.

The largest gap appears in data encryption, where the Atom x7405C scores 4004 against the Ryzen 3 3100U's 1972, a delta of -50.7% for the AMD part. This more than doubles the AMD processor's output in this specific workload. Physics simulation shows a similar story, with the Intel chip scoring 460 versus 232, a 49.6% deficit for the Ryzen. These two tests highlight a consistent trend: the Atom's four cores and four threads are able to push far ahead in parallel workloads.

Integer math results reinforce this pattern. The Atom x7405C records 14669, while the Ryzen 3 3100U manages 8873, leaving AMD 39.5% behind. Floating-point math tells the same tale, with scores of 9063 and 5854 respectively, a 35.4% difference. Multithreaded performance, a key indicator of overall throughput, shows the Atom at 5218 versus the Ryzen's 3348, a 35.8% gap. Random string sorting, another heavily parallel task, sees the Intel part at 8089 and the AMD part at 4666, a 42.3% difference.

Even in single-threaded performance, where the Ryzen 3 3100U's higher base clock might be expected to help, the Atom x7405C still comes out ahead, albeit narrowly. The Intel chip scores 1675, while the AMD chip scores 1592, a 5% delta. This is the closest contest in the entire dataset and suggests that the Atom's architecture is highly efficient per clock despite its lower 1.70 GHz base frequency compared to the Ryzen's 1.90 GHz. Data compression, a common real-world task, also favors the Intel part, with a score of 56317 versus 38455, a 31.7% advantage. The extended instructions test shows a 23.6% lead for the Atom, and even the find prime numbers test, which often favors higher clock speeds, sees the Intel chip winning 22 to 18.

Where Each One Wins

Based on the recorded data, the Intel Atom x7405C is the clear winner in every measured category. There is no benchmark in the database where the AMD Ryzen 3 3100U shows a performance advantage. The closest margin is in single-threaded tasks, but even there, the Intel processor maintains a lead. This means for any workload captured by these tests, whether it is encryption, physics calculations, integer math, or data sorting, the Atom x7405C is the faster part.

The Ryzen 3 3100U's strengths lie outside of these specific performance metrics. It is a 15-watt part, whereas the Atom x7405C is rated at 12 watts, making the Intel chip a lower-power option. The AMD processor also integrates Radeon Vega 8 graphics, while the Intel Atom has no integrated graphics (N/A). For a system requiring a discrete GPU, this difference is crucial. The Ryzen's architecture, based on Zen+ (Picasso), is a more traditional mobile processor design, while the Atom uses Gracemont cores, which are efficiency-focused. In a purely CPU-centric benchmark comparison, the Atom x7405C dominates, but a system builder might choose the Ryzen for its on-die graphics solution or its dual-channel memory bus.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Atom x7405C has an average benchmark score of 6568, while the AMD Ryzen 3 3100U has an average score of 6247.

Q: How much faster is the Intel Atom in data encryption?

A: The Atom x7405C scores 4004 in the data encryption test, which is 50.7% higher than the Ryzen 3 3100U's score of 1972.

Q: Does the AMD Ryzen 3 3100U win any head-to-head tests?

A: No. The recorded data shows zero wins for the Ryzen 3 3100U, with the Intel Atom x7405C winning all 11 benchmark comparisons.

Q: What is the performance difference in single-threaded tasks?

A: The Intel Atom x7405C leads with a score of 1675, while the AMD Ryzen 3 3100U scores 1592, resulting in a 5% advantage for the Intel part.

Q: Which processor has a lower thermal design power (TDP)?

A: The Intel Atom x7405C has a TDP of 12 watts, which is lower than the AMD Ryzen 3 3100U's TDP of 15 watts.

Q: Does either processor have integrated graphics?

A: The AMD Ryzen 3 3100U includes Radeon Vega 8 integrated graphics, while the Intel Atom x7405C does not have integrated graphics (listed as N/A).

Specification Differences

The two processors differ significantly in their core configurations and memory interfaces. The AMD Ryzen 3 3100U features 2 cores and 2 threads, while the Intel Atom x7405C offers 4 cores and 4 threads. The AMD part has a base clock of 1.90 GHz and a boost clock of 3.20 GHz. The Intel part has a lower base clock of 1.70 GHz but a higher boost clock of 3.40 GHz.

Memory support is another differentiator. The Ryzen 3 3100U supports DDR4 memory over a dual-channel bus. The Atom x7405C supports both DDR4 and DDR5, but uses a single-channel memory bus. Both parts have a recorded memory bandwidth of 38.4 GB/s. The AMD processor supports PCIe Gen 3, while the Intel processor also supports PCIe Gen 3, but with 9 lanes available from the CPU only. The Intel Atom x7405C has a launch MSRP of $57.

The socket types are also distinct. The AMD Ryzen 3 3100U uses the AMD Socket FP5, while the Intel Atom x7405C uses Intel BGA 1264. The AMD part has a part number of YM3100C4T2OFG, and the Intel part's part number is SRNEM. The release dates differ as well: the Ryzen 3 3100U was released in 2026, and the Atom x7405C was released in 2024.

Architecture Differences

The architectural divide between these two chips is substantial. The AMD Ryzen 3 3100U is based on the Picasso codename, belonging to the Ryzen 3 generation built on the Zen+ (Picasso) microarchitecture. It is manufactured on a 12 nm process node by GlobalFoundries, with a transistor count of 4,940 million and a die size of 210 mm². The Intel Atom x7405C, in contrast, is an Amston Lake part, part of the Atom generation using Gracemont cores. It is built on a 10 nm process node by Intel, with no transistor or die size data recorded.

Cache hierarchies also differ. Both parts have 96 KB of L1 cache per core. The AMD processor has 512 KB of L2 cache per core and 4 MB of shared L3 cache. The Intel processor has 2 MB of shared L2 cache and 6 MB of shared L3 cache. This means the Intel part has a larger total cache pool, which aligns with its higher performance in cache-sensitive workloads.

The integrated graphics situation is a major architectural difference. The AMD Ryzen 3 3100U integrates Radeon Vega 8 graphics, making it a complete APU solution. The Intel Atom x7405C has no integrated graphics, necessitating a separate GPU for display output. Additionally, the AMD part does not support ECC memory, and the Intel part also does not support ECC memory. The AMD processor's memory controller is dual-channel, while the Intel's is single-channel, which is a key architectural design choice that affects memory access patterns. Both processors are unlocked, meaning they do not have an unlocked multiplier. The production status for both is listed as active.