AMD EPYC 7451 vs AMD Ryzen 3 3100U Comparison

The Verdict

The data splits these two processors cleanly by workload class. The AMD Ryzen 3 3100U is a mobile part aimed at thin-and-light laptops, while the AMD EPYC 7451 is a server/ workstation processor built for sustained multi-threaded throughput. The recorded benchmarks show no direct head-to-head tests, but the available scores tell a clear story: the EPYC 7451 dominates in multi-core and single-core render workloads, while the Ryzen 3 3100U wins in several PassMark integer, encryption, and sorting tests. The Ryzen 3 3100U sits at the 62nd percentile among all CPUs, with an average benchmark score of 6247. The EPYC 7451 sits at the 61st percentile, with an average score of 5915. That 332-point gap (about 5.6%) favors the mobile chip in the aggregate, but the EPYC 7451’s Cinebench results show a massive advantage in threaded rendering tasks, which are more representative of server workloads.

For buyers, the choice depends on the form factor and the task. If the workload is mobile, power-efficient computing with an integrated GPU, the Ryzen 3 3100U is the only option with that feature set. If the workload is server-side virtualization, data processing, or multi-threaded content creation, the EPYC 7451 is the clear pick, despite its lower average benchmark score. The Ryzen 3 3100U is not a server part, and the EPYC 7451 is not a laptop part. The data does not suggest either chip is a substitute for the other.

Architecture Differences

The two processors come from different AMD generations and process nodes. The Ryzen 3 3100U is built on a 12 nm node at GlobalFoundries, using the Picasso codename and the Zen+ architecture. It belongs to the 3000 series, with a generation label of "Ryzen 3 (Zen+ (Picasso))". The EPYC 7451 is built on a 14 nm node, also at GlobalFoundries, using the Naples codename and the original Zen architecture, from the EPYC 7001 series. The process node difference means the Ryzen 3 3100U uses a more refined manufacturing process, which likely contributes to its lower thermal design power.

Core counts differ enormously. The Ryzen 3 3100U has 2 cores and 2 threads, while the EPYC 7451 has 24 cores and 48 threads. The EPYC 7451’s thread count is 24 times higher than the Ryzen 3 3100U’s thread count, reflecting its server-class design. Cache configurations also diverge. Both chips have 96 KB of L1 cache per core and 512 KB of L2 cache per core. The L3 cache, however, is 4 MB shared on the Ryzen 3 3100U versus 64 MB shared on the EPYC 7451, a 16-fold difference. Transistor counts are similar: 4,940 million on the Ryzen 3 3100U and 4,800 million on the EPYC 7451, with die sizes of 210 mm² and 213 mm² respectively.

Memory support differs in channel count and bandwidth. The Ryzen 3 3100U uses dual-channel DDR4 with 38.4 GB/s of bandwidth and no ECC support. The EPYC 7451 uses eight-channel DDR4 with 170.6 GB/s of bandwidth and ECC support. That is a 4.4 times bandwidth advantage for the EPYC 7451. Both use PCIe Gen 3. The Ryzen 3 3100U includes integrated Radeon Vega 8 graphics, while the EPYC 7451 has no integrated graphics. The Ryzen 3 3100U is a mobile part on AMD Socket FP5, while the EPYC 7451 is a server part on AMD Socket SP3. The Ryzen 3 3100U has a locked multiplier, while the EPYC 7451 has an unlocked multiplier.

Where Each One Wins

The EPYC 7451 wins decisively in multi-threaded render workloads. Its Cinebench R15 multi-core score is 2061, R20 multi-core is 8589, and R23 multi-core is 20450. These numbers reflect a 24-core, 48-thread processor that scales well across parallel tasks. The Ryzen 3 3100U has no Cinebench scores in the database, so a direct comparison is impossible, but the EPYC 7451’s percentile ranking (61st) and its nearest rivals (Intel Core i9-9920X at 5917, Intel Xeon W-2170B at 5985) show it sits in high-end desktop and workstation territory. The EPYC 7451 also wins in single-core Cinebench tests: R15 single-core at 290, R20 single-core at 1212, and R23 single-core at 2887. The Ryzen 3 3100U’s PassMark single-thread score is 1592, which is lower than the EPYC 7451’s Cinebench R23 single-core score of 2887, though the tests are not directly comparable.

The Ryzen 3 3100U wins in several PassMark subtests. Its PassMark data compression score is 38455, which is far above the EPYC 7451’s average score of 5915, though again the tests differ. The Ryzen 3 3100U’s PassMark integer math score is 8873, its floating point math score is 5854, and its random string sorting score is 4666. Its PassMark multithread score is 3348. The EPYC 7451 has no PassMark scores in the database, so the Ryzen 3 3100U’s wins in these categories are by default, not by direct comparison. The Ryzen 3 3100U also has a higher average benchmark score (6247 vs 5915) and a higher percentile ranking (62nd vs 61st). The data suggests the Ryzen 3 3100U is better optimized for the specific PassMark workloads, while the EPYC 7451 is better for Cinebench render workloads.

FAQ

Q: Which processor has more cores?

A: The AMD EPYC 7451 has 24 cores and 48 threads, while the AMD Ryzen 3 3100U has 2 cores and 2 threads.

Q: What is the memory bandwidth difference?

A: The EPYC 7451 supports eight-channel DDR4 with 170.6 GB/s of bandwidth, while the Ryzen 3 3100U supports dual-channel DDR4 with 38.4 GB/s of bandwidth. The EPYC 7451’s bandwidth is 4.4 times higher.

Q: Does either processor support ECC memory?

A: The EPYC 7451 supports ECC memory, while the Ryzen 3 3100U does not.

Q: Which chip has integrated graphics?

A: The Ryzen 3 3100U includes Radeon Vega 8 integrated graphics. The EPYC 7451 has no integrated graphics.

Q: Which processor has a higher average benchmark score?

A: The Ryzen 3 3100U has an average benchmark score of 6247, which is 332 points higher than the EPYC 7451’s 5915. The Ryzen 3 3100U also ranks at the 62nd percentile versus the EPYC 7451’s 61st percentile.

Q: Are these processors from the same architecture generation?

A: No. The Ryzen 3 3100U uses the Zen+ (Picasso) architecture on a 12 nm process, while the EPYC 7451 uses the original Zen (Naples) architecture on a 14 nm process.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results between the Ryzen 3 3100U and the EPYC 7451. Instead, the recorded data shows each chip’s performance in separate test suites. The EPYC 7451’s Cinebench results are the strongest evidence of its multi-threaded capability. In Cinebench R23 multi-core, it scores 20450, which is 2.4 times its R20 multi-core score of 8589 and nearly 10 times its R15 multi-core score of 2061. That scaling across Cinebench versions indicates consistent multi-threaded performance. In single-core Cinebench, the EPYC 7451 scores 2887 in R23, 1212 in R20, and 290 in R15. The R23 single-core score is 2.4 times the R20 single-core score, showing strong single-thread scaling as well.

The Ryzen 3 3100U’s PassMark scores provide a different view. Its data compression score of 38455 is the highest single subtest score in the database for this chip, far above its integer math score of 8873 and floating point math score of 5854. Its multithread score is 3348, and its single-thread score is 1592. The Ryzen 3 3100U’s nearest rivals in the database include the AMD Ryzen Threadripper 1950X (average score 6231, 0.3% higher), the AMD EPYC 7272 (6186, 1% higher), the Intel Core i9-10920X (6347, 1.6% higher), and the Intel Core i9-7940X (6147, 1.6% lower). The EPYC 7451’s nearest rivals include the Intel Core i9-9920X (5917, 0% difference), the Intel Xeon W-2170B (5985, 1.2% higher), the AMD EPYC 7401P (5814, 1.7% lower), and the Intel Xeon E-2388G (5805, 1.9% lower). These rival comparisons show both chips sit within a narrow band of similar-performing processors, despite their different form factors.

The biggest win for the EPYC 7451 is in multi-core render performance, where its 24-core design produces Cinebench R23 multi-core scores that dwarf the Ryzen 3 3100U’s entire PassMark suite. The biggest win for the Ryzen 3 3100U is in aggregate average score, where its 6247 average beats the EPYC 7451’s 5915 by 5.6%. The data does not support a single overall winner. It supports a split: render-heavy server tasks favor the EPYC 7451, while the Ryzen 3 3100U holds its own in the PassMark test suite with a higher percentile rank.

Specification Differences

The two processors differ in nearly every specification that defines their class. Core and thread counts: the Ryzen 3 3100U has 2 cores and 2 threads, the EPYC 7451 has 24 cores and 48 threads. Base clock: the Ryzen 3 3100U runs at 1.90 GHz, the EPYC 7451 at 2.30 GHz. Boost clock: both reach 3.20 GHz. Thermal design power: the Ryzen 3 3100U is rated at 15 W, the EPYC 7451 at 180 W, a 12-fold difference. Socket: the Ryzen 3 3100U uses AMD Socket FP5, the EPYC 7451 uses AMD Socket SP3.

Process node and architecture: the Ryzen 3 3100U uses 12 nm with Zen+ (Picasso), the EPYC 7451 uses 14 nm with Zen (Naples). Transistors: 4,940 million versus 4,800 million. Die size: 210 mm² versus 213 mm². L3 cache: 4 MB shared on the Ryzen 3 3100U, 64 MB shared on the EPYC 7451. Memory bus: dual-channel versus eight-channel. Memory bandwidth: 38.4 GB/s versus 170.6 GB/s. ECC support: not supported on the Ryzen 3 3100U, supported on the EPYC 7451. Integrated graphics: Radeon Vega 8 on the Ryzen 3 3100U, none on the EPYC 7451. Market segment: Mobile versus Server/Workstation. Multiplier: locked on the Ryzen 3 3100U, unlocked on the EPYC 7451. Release dates also differ: the Ryzen 3 3100U has a release date of 2026-05-31, while the EPYC 7451 has a release date of 2017-06-28. Both use PCIe Gen 3, both support DDR4 memory, and both are manufactured by AMD at GlobalFoundries. The part numbers are YM3100C4T2OFG for the Ryzen 3 3100U and PS7451BDVHCAF for the EPYC 7451. Neither processor has a launch MSRP listed in the database.