PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

Celeron 3855U vs Celeron E3400 FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

Celeron 3855U vs Celeron E3400: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

Celeron 3855U

2015

Why buy it

✅+4% higher Geekbench single-core performance for gaming and desktop responsiveness.
✅Draws 15W instead of 65W, a 50W reduction.
✅100+% more PCIe lanes (10 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel HD Graphics 510, while Celeron E3400 needs a discrete GPU.

Trade-offs

❌No boxed cooler included, unlike Celeron E3400.

Celeron E3400

2010

Why buy it

✅Includes a boxed cooler (true), unlike Celeron 3855U.

Trade-offs

❌Lower Geekbench single-core performance for gaming (347 vs 361).
❌Lower Geekbench multi-core (624 vs 632).
❌Launch MSRP is still $53 MSRP, while Celeron 3855U mostly shows up through inconsistent older-market listings.
❌333.3% higher power demand at 65W vs 15W.
❌No integrated graphics, while Celeron 3855U can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Celeron 3855U better than Celeron E3400?

Yes. Celeron 3855U is the better all-around CPU here. It gives you a 2.1% average FPS lead across 50 shared CPU game tests in our data, 1.3% better Geekbench multi-core, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Celeron 3855U is the better pick. According to our tests, it delivers 2.1% more average FPS across 50 shared CPU game tests.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, Celeron 3855U is the stronger fit. You are getting 1.3% better Geekbench multi-core, backed by 2 cores and 2 threads.

Which one is the smarter buy today, not just the cheaper CPU?

Celeron 3855U is still the much better call for a fresh build. Celeron 3855U comes in at an unclear MSRP at unclear MSRP versus $53 MSRP, and it still gives you a 2.1% average FPS lead across 50 shared CPU game tests in our data. Celeron E3400 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2010 platform. Even with 100.0% better value on paper (23.0 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on LGA775.

Which one is more future-proof for 2026 and beyond?

Celeron 3855U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2010) and more multi-core headroom with 2 cores / 2 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Celeron 3855U vs Celeron E3400 Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

Celeron 3855U

The Celeron 3855U is manufactured by Intel. It was released in 15 August 2015 (10 years ago). It is based on the Skylake (2015−2016) architecture. It features 2 cores and 2 threads. Base frequency is 1.6 GHz, with boost up to 1.6 GHz. L3 cache: 2 MB. L2 cache: 512 kB. Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR4-1866/2133, LPDDR3-1600/1866, DDR3L-1333/1600. Passmark benchmark score: 1,215 points. Launch price was $107.

Celeron E3400

The Celeron E3400 is manufactured by Intel. It was released in 17 January 2010 (15 years ago). It is based on the Wolfdale (2008−2010) architecture. It features 2 cores and 2 threads. Base frequency is 2.6 GHz, with boost up to 2.6 GHz. L3 cache: 0 kB. L2 cache: 1 MB (total). Built on 45 nm process technology. Socket: LGA775. Thermal design power (TDP): 65 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 1,220 points. Launch price was $76.

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Processing Power

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.

Feature	Celeron 3855U	Celeron E3400
Cores / Threads	2 / 2	2 / 2
Boost Clock	1.6 GHz	2.6 GHz+63%
Base Clock	1.6 GHz	2.6 GHz+63%
L3 Cache	2 MB	0 kB
L2 Cache	512 kB	1 MB (total)+100%
Process	14 nm-69%	45 nm
Architecture	Skylake (2015−2016)	Wolfdale (2008−2010)
PassMark	1,215	1,220
Geekbench 6 Single	361+4%	347
Geekbench 6 Multi	632+1%	624

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Memory & Platform

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 100.1% 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 GB — 300% 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).

Feature	Celeron 3855U	Celeron E3400
Socket	BGA1356	LGA775
PCIe Generation	PCIe 3.0+173%	PCIe 1.1
Max RAM Speed	DDR4 2133 MHz+100%	1066
Max RAM Capacity	32 GB+300%	8 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	10	0

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Advanced Features

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.