Core 2 Duo T6670 vs Core i5-661

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 T6670 vs Core i5-661 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 T6670 vs Core i5-661: 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 T6670

2009

Why buy it

✅Draws 2W instead of 87W, a 85W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-661 across 50 shared CPU benchmark tests.
❌Lower PassMark (2,365 vs 2,387).
❌Smaller total L3 cache (2 MB vs 4 MB).

Core i5-661

2010

Why buy it

✅Better for gaming: +4.1% higher average FPS across 50 shared CPU benchmark tests.
✅+100% larger total L3 cache (4 MB vs 2 MB).

Trade-offs

❌Launch MSRP is still $196 MSRP, while Core 2 Duo T6670 mostly shows up through inconsistent older-market listings.
❌4250% higher power demand at 87W vs 2W.

Quick Answers

So, is Core i5-661 better than Core 2 Duo T6670?

Yes. Core i5-661 is the better all-around CPU here. It gives you a 4.1% average FPS lead across 50 shared CPU game tests in our data, 0.9% better PassMark, 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 i5-661 is the better pick. According to our tests, it delivers 4.1% 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, Core i5-661 is the stronger fit. You are getting 0.9% better PassMark, backed by 2 cores and 4 threads. It also has the larger cache pool with 100% larger total L3 cache (4 MB vs 2 MB).

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

Core i5-661 is the better buy right now. Core i5-661 comes in at an unclear MSRP at $196 MSRP versus unclear MSRP, and it still gives you a 4.1% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (12.2 vs 0.0 PassMark/$), 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 i5-661 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2010 vs 2009), 100% larger total L3 cache (4 MB vs 2 MB), and more multi-core headroom with 2 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 T6670 vs Core i5-661 Technical Specifications

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

Core 2 Duo T6670

The Core 2 Duo T6670 is manufactured by Intel. It was released in 2008-01-01. It is based on the Penryn (2008−2011) architecture. It features 2 cores and 2 threads. Base frequency is 2.2 GHz, with boost up to 2.2 GHz. L3 cache: 2 MB L2 Cache. L2 cache: 2 MB. Built on 45 nm process technology. Socket: PGA478. Thermal design power (TDP): 35 Watt. Passmark benchmark score: 2,365 points. Launch price was $249.

Core i5-661

The Core i5-661 is manufactured by Intel. It was released in 7 January 2010 (15 years ago). It is based on the Clarkdale (2010−2011) architecture. It features 2 cores and 4 threads. Base frequency is 3.33 GHz, with boost up to 3.6 GHz. L3 cache: 4 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1156. Thermal design power (TDP): 87 Watt. Memory support: DDR3. Passmark benchmark score: 2,387 points. Launch price was $252.

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Processing Power

The Core 2 Duo T6670 packs 2 cores / 2 threads, matching the Core i5-661's 2 cores. Boost clocks reach 2.2 GHz on the Core 2 Duo T6670 versus 3.6 GHz on the Core i5-661 — a 48.3% clock advantage for the Core i5-661 (base: 2.2 GHz vs 3.33 GHz). The Core 2 Duo T6670 uses the Penryn (2008−2011) architecture (45 nm), while the Core i5-661 uses Clarkdale (2010−2011) (32 nm). In PassMark, the Core 2 Duo T6670 scores 2,365 against the Core i5-661's 2,387 — a 0.9% lead for the Core i5-661. L3 cache: 2 MB L2 Cache on the Core 2 Duo T6670 vs 4 MB (total) on the Core i5-661.

Feature	Core 2 Duo T6670	Core i5-661
Cores / Threads	2 / 2	2 / 4
Boost Clock	2.2 GHz	3.6 GHz+64%
Base Clock	2.2 GHz	3.33 GHz+51%
L3 Cache	2 MB L2 Cache	4 MB (total)+100%
L2 Cache	2 MB+700%	256 kB (per core)
Process	45 nm	32 nm-29%
Architecture	Penryn (2008−2011)	Clarkdale (2010−2011)
PassMark	2,365	2,387
Geekbench 6 Single	252	—
Geekbench 6 Multi	252	—

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Memory & Platform

The Core 2 Duo T6670 uses the PGA478 socket (PCIe 1.1), while the Core i5-661 uses LGA1156 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Core 2 Duo T6670	Core i5-661
Socket	PGA478	LGA1156
PCIe Generation	PCIe 1.1	PCIe 2.0+82%
Max RAM Speed	DDR3-1066	—
Max RAM Capacity	8 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	0	—

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Advanced Features

Virtualization: VT-x (Core 2 Duo T6670) / not specified (Core i5-661). Primary use case: Core 2 Duo T6670 targets Budget. Direct competitor: Core 2 Duo T6670 rivals Core 2 Duo T6600.