Celeron 3755U vs Core 2 Duo E6400

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 3755U vs Core 2 Duo E6400 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 3755U vs Core 2 Duo E6400: Pros, Cons & Final Verdict

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

Celeron 3755U

2015

Why buy it

✅+0.6% higher PassMark.
✅Draws 15W instead of 65W, a 50W reduction.
✅Integrated graphics onboard with HD Graphics (Broadwell), while Core 2 Duo E6400 needs a discrete GPU.

Trade-offs

❌No boxed cooler included, unlike Core 2 Duo E6400.

Core 2 Duo E6400

2006

Why buy it

✅33.3% more PCIe lanes (16 vs 12) for storage and expansion-heavy builds.
✅Includes a boxed cooler (true), unlike Celeron 3755U.

Trade-offs

❌Lower PassMark (1,175 vs 1,182).
❌Launch MSRP is still $183 MSRP, while Celeron 3755U mostly shows up through inconsistent older-market listings.
❌333.3% higher power demand at 65W vs 15W.
❌No integrated graphics, while Celeron 3755U can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Celeron 3755U better than Core 2 Duo E6400?

It depends on what you want from the system. For gaming, Core 2 Duo E6400 is ahead with a 1.6% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Celeron 3755U pulls ahead with 0.6% better PassMark.

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

For streaming, content creation, and heavier multitasking, Celeron 3755U is the stronger fit. You are getting 0.6% better PassMark, backed by 2 cores and 2 threads.

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

Celeron 3755U is still the much better call for a fresh build. Celeron 3755U comes in at an unclear MSRP at unclear MSRP versus $183 MSRP, and it still gives you 0.6% better PassMark. Core 2 Duo E6400 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2006 platform. Even with 100.0% better value on paper (6.4 vs 0.0 PassMark/$), 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 3755U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2006) 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 3755U vs Core 2 Duo E6400 Technical Specifications

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

Celeron 3755U

The Celeron 3755U is manufactured by Intel. It was released in 1 March 2015 (10 years ago). It is based on the Broadwell-U (2015) architecture. It features 2 cores and 2 threads. Base frequency is 1.7 GHz, with boost up to 1.7 GHz. L3 cache: 2 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: FCBGA1168. Thermal design power (TDP): 15 Watt. Memory support: DDR3. Passmark benchmark score: 1,182 points. Launch price was $107.

Core 2 Duo E6400

The Core 2 Duo E6400 is manufactured by Intel. It was released in 2008-01-01. It is based on the Conroe (2006−2007) architecture. It features 2 cores and 2 threads. Base frequency is 2.13 GHz, with boost up to 2.13 GHz. L3 cache: 0 kB. L2 cache: 2 MB. Built on 65 nm process technology. Socket: LGA775. Thermal design power (TDP): 65 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 1,175 points. Launch price was $249.

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Processing Power

Both the Celeron 3755U and Core 2 Duo E6400 share an identical 2-core/2-thread configuration. Boost clocks reach 1.7 GHz on the Celeron 3755U versus 2.13 GHz on the Core 2 Duo E6400 — a 22.5% clock advantage for the Core 2 Duo E6400 (base: 1.7 GHz vs 2.13 GHz). The Celeron 3755U uses the Broadwell-U (2015) architecture (14 nm), while the Core 2 Duo E6400 uses Conroe (2006−2007) (65 nm). In PassMark, the Celeron 3755U scores 1,182 against the Core 2 Duo E6400's 1,175 — a 0.6% lead for the Celeron 3755U. L3 cache: 2 MB (total) on the Celeron 3755U vs 0 kB on the Core 2 Duo E6400.

Feature	Celeron 3755U	Core 2 Duo E6400
Cores / Threads	2 / 2	2 / 2
Boost Clock	1.7 GHz	2.13 GHz+25%
Base Clock	1.7 GHz	2.13 GHz+25%
L3 Cache	2 MB (total)	0 kB
L2 Cache	256K (per core)+12700%	2 MB
Process	14 nm-78%	65 nm
Architecture	Broadwell-U (2015)	Conroe (2006−2007)
PassMark	1,182	1,175
Geekbench 6 Multi	625	—

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Memory & Platform

The Celeron 3755U uses the FCBGA1168 socket (PCIe 3.0), while the Core 2 Duo E6400 uses LGA775 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3L-1600 on the Celeron 3755U versus 1066 on the Core 2 Duo E6400 — the Celeron 3755U supports 50.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 16 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 12 (Celeron 3755U) vs 16 (Core 2 Duo E6400) — the Core 2 Duo E6400 offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Wildcat Point-LP (Celeron 3755U) and P35,G31,G33,P45 (Core 2 Duo E6400).

Feature	Celeron 3755U	Core 2 Duo E6400
Socket	FCBGA1168	LGA775
PCIe Generation	PCIe 3.0+173%	PCIe 1.1
Max RAM Speed	DDR3L-1600+50%	1066
Max RAM Capacity	16 GB	16 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	12	16+33%

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Advanced Features

Neither processor supports overclocking. Virtualization support: VT-x, VT-d (Celeron 3755U) vs true (Core 2 Duo E6400). The Celeron 3755U includes integrated graphics (HD Graphics (Broadwell)), while the Core 2 Duo E6400 requires a dedicated GPU. Primary use case: Celeron 3755U targets Budget. Direct competitor: Celeron 3755U rivals Pentium 3825U; Core 2 Duo E6400 rivals Athlon 64 X2 5400+.