Celeron Dual-Core T3100 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 Dual-Core T3100 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 Dual-Core T3100 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 Dual-Core T3100

2009

Why buy it

✅Draws 1W instead of 65W, a 64W reduction.

Trade-offs

❌Lower PassMark (1,174 vs 1,175).
❌No boxed cooler included, unlike Core 2 Duo E6400.

Core 2 Duo E6400

2006

Why buy it

✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Includes a boxed cooler (true), unlike Celeron Dual-Core T3100.

Trade-offs

❌Launch MSRP is still $183 MSRP, while Celeron Dual-Core T3100 mostly shows up through inconsistent older-market listings.
❌6400% higher power demand at 65W vs 1W.

Quick Answers

So, is Core 2 Duo E6400 better than Celeron Dual-Core T3100?

Yes. Core 2 Duo E6400 is the better all-around CPU here. It gives you 0.1% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Core 2 Duo E6400 has the edge because it leads the single-thread side of this matchup with 12.1% higher max boost clock.

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

For streaming, content creation, and heavier multitasking, Core 2 Duo E6400 is the stronger fit. You are getting 0.1% better PassMark, backed by 2 cores and 2 threads.

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

Core 2 Duo E6400 is the better buy right now. Core 2 Duo E6400 comes in at an unclear MSRP at $183 MSRP versus unclear MSRP, and it still gives you 0.1% higher PassMark. It is also 100.0% better value on MSRP (6.4 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Celeron Dual-Core T3100 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2009 vs 2006). That makes it the safer long-term bet.

Celeron Dual-Core T3100 vs Core 2 Duo E6400 Technical Specifications

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

Celeron Dual-Core T3100

The Celeron Dual-Core T3100 is manufactured by Intel. It was released in 2007-01-01. It is based on the Penryn (2008−2011) architecture. It features 2 cores and 2 threads. Max frequency: 1.9 GHz. L2 cache: 1 MB. Built on 45 nm process technology. Socket: PGA478. Thermal design power (TDP): 1 MB. Passmark benchmark score: 1,174 points. Launch price was $69.

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 Dual-Core T3100 and Core 2 Duo E6400 share an identical 2-core/2-thread configuration. Boost clocks reach 1.9 GHz on the Celeron Dual-Core T3100 versus 2.13 GHz on the Core 2 Duo E6400 — a 11.4% clock advantage for the Core 2 Duo E6400. The Celeron Dual-Core T3100 uses the Penryn (2008−2011) architecture (45 nm), while the Core 2 Duo E6400 uses Conroe (2006−2007) (65 nm). In PassMark, the Celeron Dual-Core T3100 scores 1,174 against the Core 2 Duo E6400's 1,175 — a 0.1% lead for the Core 2 Duo E6400.

Feature	Celeron Dual-Core T3100	Core 2 Duo E6400
Cores / Threads	2 / 2	2 / 2
Boost Clock	1.9 GHz	2.13 GHz+12%
Base Clock	—	2.13 GHz
L3 Cache	—	0 kB
L2 Cache	1 MB	2 MB+100%
Process	45 nm-31%	65 nm
Architecture	Penryn (2008−2011)	Conroe (2006−2007)
PassMark	1,174	1,175

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Memory & Platform

The Celeron Dual-Core T3100 uses the PGA478 socket (PCIe 1.1), while the Core 2 Duo E6400 uses LGA775 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-800 on the Celeron Dual-Core T3100 versus 1066 on the Core 2 Duo E6400 — the Core 2 Duo E6400 supports 33.3% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core 2 Duo E6400 supports up to 16 GB of RAM compared to 8 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Celeron Dual-Core T3100) vs 16 (Core 2 Duo E6400) — the Core 2 Duo E6400 offers 16 more lanes for additional GPUs or NVMe drives. Chipset compatibility: GL40,GM45,GS45 (Celeron Dual-Core T3100) and P35,G31,G33,P45 (Core 2 Duo E6400).

Feature	Celeron Dual-Core T3100	Core 2 Duo E6400
Socket	PGA478	LGA775
PCIe Generation	PCIe 1.1	PCIe 1.1
Max RAM Speed	DDR3-800	1066+33%
Max RAM Capacity	8 GB	16 GB+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	0	16

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Advanced Features

Neither processor supports overclocking. Virtualization support: No (Celeron Dual-Core T3100) vs true (Core 2 Duo E6400). Primary use case: Celeron Dual-Core T3100 targets Budget. Direct competitor: Celeron Dual-Core T3100 rivals Pentium T4200; Core 2 Duo E6400 rivals Athlon 64 X2 5400+.