Intel Core i3-1305U vs Intel Xeon Bronze 3408U Comparison

Where Each One Wins

The benchmark split is decisively lopsided: the Intel Xeon Bronze 3408U takes 13 of 17 head-to-head tests, while the Intel Core i3-1305U wins only 4. The Xeon is the clear multi-threaded and compute-heavy champion, while the Core i3 is a single-thread specialist with two notable encryption and integer math victories.

The Xeon Bronze 3408U dominates across every Cinebench iteration. In Cinebench R23 multi-core it scores 8473 versus 7183 for the Core i3, a 15.2% advantage. The same pattern holds in R20 multi-core (3558 versus 3016) and R15 multi-core (853 versus 723). Even in single-core Cinebench tests, the Xeon leads by roughly 15%: R23 single-core shows 1196 versus 1014, and R20 single-core shows 502 versus 425. This is unexpected given the Core i3's much higher boost clock, but the recorded data is unambiguous.

The Xeon's largest wins come in extended instruction throughput and prime number finding. Passmark extended instructions shows 10387 for the Xeon versus 5240 for the Core i3, a massive 49.6% gap. Passmark find prime numbers is even more lopsided: 119 versus 36, a 69.7% deficit for the Core i3. Floating point math also favors the Xeon heavily, 29142 versus 19687, a 32.4% gap. Physics simulation follows the same trend: 1114 versus 523, a 53.1% difference.

The Core i3-1305U wins where the Xeon is weakest. Passmark single thread is its crowning achievement: 3115 versus 1516, a 105.5% advantage, meaning the Core i3 is more than twice as fast in that specific workload. Integer math also favors the Core i3: 27925 versus 22803, a 22.5% win. Data encryption is the third victory, 5895 versus 5274, an 11.8% edge. The fourth win is narrower: data compression shows 92767 versus 95714, which is actually a Xeon victory in raw score, so the Core i3's four wins are encryption, integer math, and the two identical single-thread entries.

The average benchmark score reflects the overall balance: the Xeon Bronze 3408U sits at 12019, the Core i3-1305U at 11200. Percentile rankings are close, 67th versus 66th percentile among all CPUs, but the Xeon edges ahead in aggregate performance.

FAQ

Q: Which processor is faster in single-threaded workloads?

A: The Intel Core i3-1305U wins decisively. Passmark single thread records 3115 for the Core i3 versus 1516 for the Xeon Bronze 3408U, a 105.5% advantage. Interestingly, the Xeon still wins Cinebench single-core tests by about 15% despite this, which highlights how different benchmark suites can rank processors differently.

Q: How do the two compare in multi-core rendering?

A: The Xeon Bronze 3408U is consistently about 15% faster. Cinebench R23 multi-core shows 8473 versus 7183, R20 multi-core shows 3558 versus 3016, and R15 multi-core shows 853 versus 723. Passmark multithread also favors the Xeon, 9969 versus 8747, a 12.3% lead.

Q: Which CPU handles encryption better?

A: The Core i3-1305U wins Passmark data encryption with 5895 points versus 5274 for the Xeon, an 11.8% margin. This is one of only four tests the Core i3 wins outright.

Q: Is the Xeon always faster in math-heavy tasks?

A: No. The Xeon wins floating point math decisively (29142 versus 19687, a 32.4% gap) and prime number finding (119 versus 36, a 69.7% gap), but the Core i3 wins integer math with 27925 versus 22803, a 22.5% advantage. The Xeon also dominates extended instructions, 10387 versus 5240, a 49.6% margin.

Q: What is the memory bandwidth difference?

A: The Xeon Bronze 3408U supports eight-channel DDR5 memory with a recorded bandwidth of 256.0 GB/s. The Core i3-1305U uses dual-channel DDR4 or DDR5 memory, and no bandwidth figure is recorded for it in the database.

Q: Do both processors support ECC memory?

A: No. The Xeon Bronze 3408U has ECC memory support enabled, while the Core i3-1305U does not support ECC memory.

Head-to-Head Benchmarks

The largest single victory belongs to the Core i3-1305U in Passmark single thread, where it doubles the Xeon's score: 3115 versus 1516, a 105.5% delta. This is the only test where either processor more than doubles the other. The same result appears twice in the database, once as passmark_single_thread and once as passmark_singlethread, both recording identical values.

The Xeon's biggest win is Passmark find prime numbers, where it scores 119 against the Core i3's 36, a 69.7% margin. Passmark physics is nearly as dominant: 1114 versus 523, a 53.1% gap. Extended instructions show a 49.6% lead for the Xeon (10387 versus 5240), and floating point math gives the Xeon a 32.4% edge (29142 versus 19687).

Cinebench results are remarkably consistent. Every Cinebench test, multi-core and single-core alike, shows the Xeon ahead by 15.0% to 15.3%. The narrowest Cinebench gap is R15 single-core at 15.0% (120 versus 102), and the widest is R20 single-core at 15.3% (502 versus 425). This uniformity suggests the Xeon's architecture delivers a steady advantage in rendering workloads regardless of thread count.

Passmark multithread gives the Xeon a 12.3% win (9969 versus 8747), and random string sorting favors the Xeon by 9.8% (12073 versus 10889). Data compression is the closest overall test: the Xeon wins with 95714 versus 92767, a mere 3.1% margin.

The Core i3's wins beyond single thread are integer math (27925 versus 22803, a 22.5% edge) and data encryption (5895 versus 5274, an 11.8% edge). These two victories, combined with the single-thread sweep, give the Core i3 a clear identity as a low-power part that punches above its weight in specific scalar workloads.

Specification Differences

The two processors diverge sharply on core configuration. The Core i3-1305U has 5 cores and 6 threads, while the Xeon Bronze 3408U has 8 cores and 8 threads. The Xeon has more physical cores but no hyper-threading, whereas the Core i3 has fewer cores but gains one extra thread via hyper-threading.

Clock speeds tell an interesting story. The Core i3 has a base clock of 1600.00 MHz and a boost clock of 4500.00 MHz, a very wide frequency range. The Xeon runs at 1800.00 MHz base and only 1900.00 MHz boost, an extremely narrow range. This explains why the Core i3 wins single-thread Passmark so decisively, yet the Xeon still leads Cinebench single-core, indicating that raw clock speed is not the only factor.

Thermal design power differs enormously: the Core i3 is rated at 15 W, the Xeon at 125 W. The Core i3 is clearly a mobile-focused part, while the Xeon is a server/workstation processor. Sockets reinforce this: the Core i3 uses Intel BGA 1744, a soldered mobile socket, while the Xeon uses Intel Socket 4677, a server platform socket.

Memory support is a major differentiator. The Core i3 supports both DDR4 and DDR5 in a dual-channel configuration. The Xeon supports only DDR5 but across eight channels, with a recorded memory bandwidth of 256.0 GB/s. ECC memory is supported on the Xeon but not on the Core i3.

PCIe capabilities also diverge. The Core i3 provides Gen 4 with 8 lanes (CPU only). The Xeon provides Gen 5 with 80 lanes (CPU only), a tenfold increase in lane count and a newer generation.

Integrated graphics are present only on the Core i3, which includes UHD Graphics 64EU. The Xeon has no integrated graphics listed. The market segments reflect this: the Core i3 is classified as Mobile, the Xeon as Server/Workstation.

Release dates are close: the Core i3 launched on 2023-01-03, the Xeon on 2023-01-09. Both are Active in production. The launch MSRP for the Core i3 is $309, and for the Xeon it is $425.

Architecture Differences

The Core i3-1305U is built on Raptor Lake, specifically the Raptor Lake-U codename, and belongs to the Core i3 (Raptor Lake-U) generation. The Xeon Bronze 3408U uses Sapphire Rapids, with the Sapphire Rapids-SP generation designation. Both are fabricated on a 10 nm process by Intel, so the node is identical.

Cache hierarchies share the same L1 design: 80 KB per core for both. The L2 cache differs: the Core i3 has 1.25 MB per core, while the Xeon has 2 MB per core. The L3 cache is a larger divergence: the Core i3 has 10 MB shared, while the Xeon has 22.5 MB. This larger L3 pool, combined with more cores, helps explain the Xeon's advantage in multi-threaded and cache-sensitive workloads.

The part numbers differ: the Core i3 is SRMLT, the Xeon is SRMGB. Neither processor has an unlocked multiplier, so overclocking is not officially supported for either. The foundry for both is Intel.

The architecture differences map cleanly onto the benchmark results. The Xeon's Sapphire Rapids design targets sustained server workloads, with eight memory channels, 80 PCIe Gen 5 lanes, and ECC support. The Core i3's Raptor Lake-U design prioritizes mobile efficiency, with a 15 W TDP, integrated graphics, and a high boost clock for bursty single-thread tasks. The 22.5 MB L3 cache on the Xeon versus 10 MB on the Core i3 is a practical factor in the Xeon's 15% Cinebench lead, while the Core i3's higher boost clock fuels its 105.5% single-thread Passmark win.

The Verdict

Choose the Intel Xeon Bronze 3408U if the workload is multi-threaded rendering, physics simulation, floating point math, or extended instruction throughput. The data shows a 15.2% lead in Cinebench R23 multi-core, a 53.1% lead in Passmark physics, a 32.4% lead in floating point math, and a 49.6% lead in extended instructions. The Xeon also wins 13 of 17 head-to-head tests and holds a higher average benchmark score of 12019 versus 11200. Its eight memory channels, 256.0 GB/s bandwidth, ECC support, and 80 PCIe Gen 5 lanes make it the appropriate choice for server or workstation deployments where sustained throughput and reliability features matter.

Choose the Intel Core i3-1305U if the priority is single-thread responsiveness or specific scalar workloads. It doubles the Xeon in Passmark single thread (3115 versus 1516, a 105.5% advantage), wins integer math by 22.5%, and takes data encryption by 11.8%. Its 15 W TDP and integrated UHD Graphics 64EU make it suitable for mobile systems where power draw and graphics output are considerations. The Core i3 also supports both DDR4 and DDR5 memory, offering platform flexibility that the DDR5-only Xeon lacks.

The verdict is not about which CPU is universally better, but which fits the intended environment. For a low-power mobile or compact system with bursty single-thread demands, the Core i3-1305U is the data-backed pick. For a server rack or workstation chassis with heavy parallel compute, the Xeon Bronze 3408U is the clear winner in the recorded benchmarks. The 15 W versus 125 W TDP difference alone signals entirely different deployment classes, and the benchmark results align with that split.