AMD Ryzen 3 3100U vs AMD Ryzen 9 5900XT Comparison

Head-to-Head Benchmarks

The recorded data presents a decisive matchup. The AMD Ryzen 9 5900XT wins every single head-to-head benchmark in the database, taking 11 of 11 tests. The Ryzen 3 3100U does not record a single victory in any shared workload, which establishes a clear performance hierarchy between these two processors.

The largest margin comes in integer math. The Ryzen 9 5900XT scores 177,566 against the Ryzen 3 3100U's 8,873, a 95% advantage. This is the widest delta in the entire comparison, and it reflects the massive difference in core count and thread resources. Floating point math tells a similar story: the 5900XT posts 99,398 points versus 5,854 for the 3100U, a 94.1% gap. Data compression swings even harder in absolute terms, with the 5900XT recording 597,862 points against 38,455 for the 3100U, a 93.6% deficit for the smaller chip.

Multi-threaded workloads show the expected pattern. The 5900XT delivers 43,810 in the PassMark multithread test, while the 3100U manages 3,348, a 92.4% difference. The physics test shows a slightly narrower gap of 86.5%, with the 5900XT at 1,715 and the 3100U at 232. Random string sorting follows at 92.5%, with scores of 62,537 and 4,666 respectively. Encryption and extended instructions both land near 95% deltas: the 5900XT scores 37,814 in encryption against 1,972, and 39,141 in extended instructions against 2,116.

The closest relative contest is single-thread performance. Here the 5900XT still wins by 54.2%, scoring 3,474 against 1,592 in the PassMark single-thread test. That is a substantial lead even in a workload where the 3100U's dual-core design should theoretically scale less poorly. The prime number search is similarly lopsided: 205 for the 5900XT versus 18 for the 3100U, a 91.2% gap.

The average benchmark score confirms the separation. The 5900XT averages 50,718 points, while the 3100U averages 6,247. The 5900XT sits in the 90th percentile of all CPUs in the database, whereas the 3100U ranks at the 62nd percentile. Contextually, the 5900XT's nearest rival is the Intel Core i7-13850HX, which scores 50,761, a 0.1% difference. The 3100U's closest competitor is the AMD Ryzen Threadripper 1950X at 6,231, a 0.3% delta. The two chips are not merely different tiers; they occupy entirely separate regions of the performance distribution.

Architecture Differences

The architectural separation is stark. The Ryzen 3 3100U is a mobile part built on the Picasso design, using the Zen+ architecture at a 12 nm process node fabricated by GlobalFoundries. The Ryzen 9 5900XT is a desktop processor codenamed Vermeer, built on Zen 3 at a 7 nm node from TSMC. The node shrink alone explains part of the efficiency and frequency advantage, though the two chips target completely different markets.

Core and thread counts diverge sharply. The 3100U offers 2 cores and 2 threads, while the 5900XT offers 16 cores and 32 threads. That is an 8x core advantage and a 16x threading advantage. Base clocks run at 1.90 GHz for the 3100U and 3.30 GHz for the 5900XT, with boost clocks of 3.20 GHz and 4.80 GHz respectively. The 5900XT carries a 105 W TDP, while the 3100U is rated at 15 W, a power envelope suited to thin-and-light mobile systems.

Cache hierarchies are fundamentally different. The 3100U uses 96 KB of L1 per core, 512 KB of L2 per core, and 4 MB of shared L3 cache. The 5900XT uses 64 KB of L1 per core, 512 KB of L2 per core, and a much larger 64 MB of L3. The total transistor count tells the scale story: the 5900XT packs 8,300 million transistors across a dual-die design of 2x 74 mm², while the 3100U uses 4,940 million transistors on a single 210 mm² die. The 5900XT's die area is smaller per die, but the total silicon is larger when both chiplets are counted.

Memory support is another differentiator. Both support DDR4 with dual-channel buses, but the 5900XT reaches 51.2 GB/s of memory bandwidth versus 38.4 GB/s for the 3100U. ECC memory is supported on the 5900XT but not on the 3100U. PCIe generation also differs: the 5900XT provides Gen 4 with 20 lanes (CPU only), while the 3100U is limited to Gen 3.

Integrated graphics exist only on the 3100U, which includes Radeon Vega 8. The 5900XT has no integrated graphics at all, listed as N/A. Sockets differ as well: the 3100U uses AMD Socket FP5, and the 5900XT uses AMD Socket AM4. The 5900XT has an unlocked multiplier; the 3100U does not. Release dates are far apart: the 3100U's recorded release date is 2026-05-31, while the 5900XT launched on 2024-07-30. The 5900XT has a launch MSRP of $349.

Where Each One Wins

The Ryzen 9 5900XT wins everywhere in the recorded data. No benchmark in the shared set favors the 3100U. That includes compression, encryption, extended instructions, prime finding, floating point math, integer math, multithread, physics, random string sorting, and single-thread tests. The smallest margin, 54.2% in single-thread, is still a dominant victory for the 5900XT.

The 3100U's role in this comparison is not as a competitor but as a reference point for the low end of the mobile stack. Its 62nd percentile ranking places it above many older desktop parts, including the Ryzen Threadripper 1950X by 0.3% and the EPYC 7272 by 1%, while trailing the Core i9-10920X by 1.6% and the Core i9-7940X by 1.6%. For a 15 W dual-core mobile chip, that positioning shows the efficiency of the Zen+ architecture, but it does nothing to close the gap with a 105 W 16-core desktop flagship.

In single-thread workloads, the 5900XT's 54.2% lead over the 3100U is notable because it isolates per-core capability. The Zen 3 architecture's higher IPC, combined with a 4.80 GHz boost clock, delivers 3,474 points versus 1,592. Even if a workload uses only one thread, the 5900XT remains far ahead. In multi-threaded tasks, the advantage compounds: 16 cores and 32 threads produce a 92.4% delta in the multithread test, and the physics test shows an 86.5% delta.

The 5900XT's benchmark profile also includes Cinebench and 3DMark results that the 3100U does not have in the database. Cinebench R23 multicore reaches 37,373 points, and R23 singlecore reaches 5,276. 3DMark max threads hits 11,040, with 16 threads at 10,624, 8 threads at 6,607, 4 threads at 3,589, and 2 threads at 1,853. These additional tests reinforce the desktop chip's placement at the 90th percentile, near the Intel Core i7-13850HX (0.1% lower), the AMD Ryzen AI 9 HX PRO 370 (0.5% higher), and the Intel Core i9-14900T (0.6% lower).

The Verdict

The data points to a simple conclusion. The Ryzen 9 5900XT is the faster processor in every measured category, with no exceptions. Anyone choosing between these two for raw compute should select the 5900XT without hesitation, provided the platform supports Socket AM4 and a 105 W TDP. The 5900XT's 90th percentile ranking, 16 cores, 32 threads, 64 MB of L3 cache, and 51.2 GB/s memory bandwidth position it as a high-end desktop part, and its nearest rivals include the Intel Core i9-14900T and the AMD Ryzen AI 9 HX PRO 370, both within 0.6%.

The Ryzen 3 3100U serves a different purpose entirely. As a 15 W mobile chip with integrated Radeon Vega 8 graphics, it targets systems where power draw and space are the constraints. Its 62nd percentile ranking, while far below the 5900XT, still places it above the Ryzen Threadripper 1950X and EPYC 7272 in average score. For light workloads on battery-powered devices, the 3100U is a functional entry point, but it cannot match the desktop chip in any compute-heavy scenario.

The verdict from the database is unambiguous. The 5900XT delivers at least 86.5% higher performance in every shared benchmark, and most deltas exceed 90%. The 3100U's only advantages are qualitative: integrated graphics, lower power draw, and a mobile form factor. Neither of those traits appears in the benchmark scores, which measure compute performance exclusively. Based on the recorded data, the Ryzen 9 5900XT is the definitive choice for performance, while the Ryzen 3 3100U remains relevant only for low-power mobile systems where the 5900XT cannot physically fit.

FAQ

Q: Which processor wins the PassMark multithread test?

A: The Ryzen 9 5900XT wins with a score of 43,810 against the Ryzen 3 3100U's 3,348, a 92.4% advantage.

Q: What is the closest benchmark result between the two?

A: The closest result is the PassMark single-thread test, where the 5900XT scores 3,474 against 1,592 for the 3100U, a 54.2% lead.

Q: How do the core counts compare?

A: The Ryzen 9 5900XT has 16 cores and 32 threads, while the Ryzen 3 3100U has 2 cores and 2 threads.

Q: Does the Ryzen 3 3100U have integrated graphics?

A: Yes, the 3100U includes Radeon Vega 8 integrated graphics. The Ryzen 9 5900XT has no integrated graphics, listed as N/A.

Q: What is the memory bandwidth difference?

A: The Ryzen 9 5900XT supports 51.2 GB/s of memory bandwidth, while the Ryzen 3 3100U supports 38.4 GB/s. Both use DDR4 with dual-channel buses.

Q: What is the largest performance gap in the shared benchmarks?

A: The largest gap is in PassMark integer math, where the 5900XT scores 177,566 versus 8,873 for the 3100U, a 95% difference.