Celeron 3855U vs Celeron E3400

Both the Celeron 3855U and Celeron E3400 share an identical 2-core/2-thread configuration. Boost clocks reach 1.6 GHz on the Celeron 3855U versus 2.6 GHz on the Celeron E3400 — a 47.6% clock advantage for the Celeron E3400 (base: 1.6 GHz vs 2.6 GHz). The Celeron 3855U uses the Skylake (2015−2016) architecture (14 nm), while the Celeron E3400 uses Wolfdale (2008−2010) (45 nm). In PassMark, the Celeron 3855U scores 1,215 against the Celeron E3400's 1,220 — a 0.4% lead for the Celeron E3400. Geekbench 6 single-core — the metric most relevant to gaming — records 361 vs 347, a 4% lead for the Celeron 3855U that directly translates to higher frame rates. Multi-core Geekbench: 632 vs 624 (1.3% advantage for the Celeron 3855U). L3 cache: 2 MB on the Celeron 3855U vs 0 kB on the Celeron E3400.

The Celeron 3855U uses the BGA1356 socket (PCIe 3.0), while the Celeron E3400 uses LGA775 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4 2133 MHz on the Celeron 3855U versus 1066 on the Celeron E3400 — the Celeron 3855U supports 190.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Celeron 3855U supports up to 32 GB of RAM compared to 8 — 120% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 10 (Celeron 3855U) vs 0 (Celeron E3400) — the Celeron 3855U offers 10 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FCBGA1356 (Celeron 3855U) and G31,G41,P35,P45 (Celeron E3400).

Neither processor supports overclocking. Both support true virtualization. The Celeron 3855U includes integrated graphics (Intel HD Graphics 510), while the Celeron E3400 requires a dedicated GPU. Primary use case: Celeron 3855U targets Budget, Celeron E3400 targets Budget. Direct competitor: Celeron 3855U rivals Pentium 3825U; Celeron E3400 rivals Pentium E5200.