Core 2 Duo T5870 vs Core 2 Quad Q8400

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.

Core 2 Duo T5870 vs Core 2 Quad Q8400 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.

Core 2 Duo T5870 vs Core 2 Quad Q8400: Pros, Cons & Final Verdict

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

Core 2 Duo T5870

2008

Why buy it

✅Draws 2W instead of 95W, a 93W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core 2 Quad Q8400 across 50 shared CPU benchmark tests.
❌Lower Geekbench multi-core (314 vs 1,155).
❌No boxed cooler included, unlike Core 2 Quad Q8400.

Core 2 Quad Q8400

2009

Why buy it

✅Better for gaming: +3.5% higher average FPS across 50 shared CPU benchmark tests.
✅Includes a boxed cooler (true), unlike Core 2 Duo T5870.

Trade-offs

❌Launch MSRP is still $183 MSRP, while Core 2 Duo T5870 mostly shows up through inconsistent older-market listings.
❌4650% higher power demand at 95W vs 2W.

Quick Answers

So, is Core 2 Quad Q8400 better than Core 2 Duo T5870?

Yes. Core 2 Quad Q8400 is the better all-around CPU here. It gives you a 3.5% average FPS lead across 50 shared CPU game tests in our data, 267.8% 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, Core 2 Quad Q8400 is the better pick. According to our tests, it delivers 3.5% 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, Core 2 Quad Q8400 is the stronger fit. You are getting 267.8% better Geekbench multi-core, backed by 4 cores and 4 threads.

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

Core 2 Quad Q8400 is the better buy right now. Core 2 Quad Q8400 comes in at an unclear MSRP at $183 MSRP versus unclear MSRP, and it still gives you a 3.5% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (11.3 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Core 2 Quad Q8400 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 4 cores / 4 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core 2 Duo T5870 vs Core 2 Quad Q8400 Technical Specifications

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

Core 2 Duo T5870

The Core 2 Duo T5870 is manufactured by Intel. It was released in 2008-01-01. It is based on the Merom (2006−2008) architecture. It features 2 cores and 2 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 2 MB L2 Cache. L2 cache: 2 MB. Built on 65 nm process technology. Thermal design power (TDP): 35 Watt. Passmark benchmark score: 2,089 points. Launch price was $249.

Core 2 Quad Q8400

The Core 2 Quad Q8400 is manufactured by Intel. It was released in 2008-01-01. It is based on the Yorkfield (2007−2009) architecture. It features 4 cores and 4 threads. Base frequency is 2.66 GHz, with boost up to 0.67 GHz. L3 cache: 0 kB. L2 cache: 4 MB (total). Built on 45 nm process technology. Socket: LGA775. Thermal design power (TDP): 95 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 2,076 points. Launch price was $249.

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Processing Power

The Core 2 Duo T5870 packs 2 cores / 2 threads, while the Core 2 Quad Q8400 offers 4 cores / 4 threads — the Core 2 Quad Q8400 has 2 more cores. Boost clocks reach 2 GHz on the Core 2 Duo T5870 versus 0.67 GHz on the Core 2 Quad Q8400 — a 99.6% clock advantage for the Core 2 Duo T5870 (base: 2 GHz vs 2.66 GHz). The Core 2 Duo T5870 uses the Merom (2006−2008) architecture (65 nm), while the Core 2 Quad Q8400 uses Yorkfield (2007−2009) (45 nm). In PassMark, the Core 2 Duo T5870 scores 2,089 against the Core 2 Quad Q8400's 2,076 — a 0.6% lead for the Core 2 Duo T5870. Geekbench 6 single-core — the metric most relevant to gaming — records 203 vs 369, a 58% lead for the Core 2 Quad Q8400 that directly translates to higher frame rates. Multi-core Geekbench: 314 vs 1,155 (114.5% advantage for the Core 2 Quad Q8400). L3 cache: 2 MB L2 Cache on the Core 2 Duo T5870 vs 0 kB on the Core 2 Quad Q8400.

Feature	Core 2 Duo T5870	Core 2 Quad Q8400
Cores / Threads	2 / 2	4 / 4+100%
Boost Clock	2 GHz+199%	0.67 GHz
Base Clock	2 GHz	2.66 GHz+33%
L3 Cache	2 MB L2 Cache	0 kB
L2 Cache	2 MB	4 MB (total)+100%
Process	65 nm	45 nm-31%
Architecture	Merom (2006−2008)	Yorkfield (2007−2009)
PassMark	2,089	2,076
Cinebench R23 Multi	—	852
Geekbench 6 Single	203	369+82%
Geekbench 6 Multi	314	1,155+268%

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Memory & Platform

Maximum memory speed reaches DDR2-800 on the Core 2 Duo T5870 versus DDR3 1333 MHz on the Core 2 Quad Q8400 — the Core 2 Quad Q8400 supports 66.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core 2 Quad Q8400 supports up to 16 GB of RAM compared to 4 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 0 PCIe lanes. Chipset compatibility: GM965,GM45,PM45 (Core 2 Duo T5870) and Intel P45,Intel G41,Intel Q45,Intel X48,Intel G31 (Core 2 Quad Q8400).

Feature	Core 2 Duo T5870	Core 2 Quad Q8400
Socket	—	LGA775
PCIe Generation	PCIe 1.1	PCIe 1.1
Max RAM Speed	DDR2-800	DDR3 1333 MHz+67%
Max RAM Capacity	4 GB	16 GB+300%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	0	0

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Advanced Features

Neither processor supports overclocking. Virtualization support: VT-x (Core 2 Duo T5870) vs true (Core 2 Quad Q8400). Primary use case: Core 2 Duo T5870 targets Legacy Mobile, Core 2 Quad Q8400 targets Desktop.