Celeron Dual-Core T3100 vs Core 2 Duo E8400

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 E8400 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 E8400: 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

✅+0.8% higher PassMark.
✅Draws 1W instead of 65W, a 64W reduction.

Trade-offs

❌No boxed cooler included, unlike Core 2 Duo E8400.

Core 2 Duo E8400

2008

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

❌Lower PassMark (1,165 vs 1,174).
❌6400% higher power demand at 65W vs 1W.

Quick Answers

So, is Celeron Dual-Core T3100 better than Core 2 Duo E8400?

It depends on what you want from the system. For gaming, Core 2 Duo E8400 is ahead with a 0.1% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Celeron Dual-Core T3100 pulls ahead with 0.8% better PassMark.

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

For streaming, content creation, and heavier multitasking, Celeron Dual-Core T3100 is the stronger fit. You are getting 0.8% better PassMark, backed by 2 cores and 2 threads.

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

Celeron Dual-Core T3100 still makes the most sense overall. Celeron Dual-Core T3100 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you 0.8% better PassMark.

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 2008) 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 Dual-Core T3100 vs Core 2 Duo E8400 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 E8400

The Core 2 Duo E8400 is manufactured by Intel. It was released in 2008-01-01. It is based on the Wolfdale (2008−2010) architecture. It features 2 cores and 2 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 0 kB. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA775. Thermal design power (TDP): 65 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 1,165 points. Launch price was $249.

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Processing Power

Both the Celeron Dual-Core T3100 and Core 2 Duo E8400 share an identical 2-core/2-thread configuration. Boost clocks reach 1.9 GHz on the Celeron Dual-Core T3100 versus 3 GHz on the Core 2 Duo E8400 — a 44.9% clock advantage for the Core 2 Duo E8400. The Celeron Dual-Core T3100 uses the Penryn (2008−2011) architecture (45 nm), while the Core 2 Duo E8400 uses Wolfdale (2008−2010) (45 nm). In PassMark, the Celeron Dual-Core T3100 scores 1,174 against the Core 2 Duo E8400's 1,165 — a 0.8% lead for the Celeron Dual-Core T3100.

Feature	Celeron Dual-Core T3100	Core 2 Duo E8400
Cores / Threads	2 / 2	2 / 2
Boost Clock	1.9 GHz	3 GHz+58%
Base Clock	—	3 GHz
L3 Cache	—	0 kB
L2 Cache	1 MB	6 MB (total)+500%
Process	45 nm	45 nm
Architecture	Penryn (2008−2011)	Wolfdale (2008−2010)
PassMark	1,174	1,165

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Memory & Platform

The Celeron Dual-Core T3100 uses the PGA478 socket (PCIe 1.1), while the Core 2 Duo E8400 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 1333 on the Core 2 Duo E8400 — the Core 2 Duo E8400 supports 66.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core 2 Duo E8400 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 E8400) — the Core 2 Duo E8400 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 E8400).

Feature	Celeron Dual-Core T3100	Core 2 Duo E8400
Socket	PGA478	LGA775
PCIe Generation	PCIe 1.1	PCIe 1.1
Max RAM Speed	DDR3-800	1333+67%
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 E8400). Primary use case: Celeron Dual-Core T3100 targets Budget. Direct competitor: Celeron Dual-Core T3100 rivals Pentium T4200; Core 2 Duo E8400 rivals Phenom II X2 550.