Core i5-661 vs Core 2 Duo T6670
Core i5-661
Core 2 Duo T6670
Performance Spectrum - CPU
About PassMark
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.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money. The Core i5-661 is positioned at rank 959 and the Core 2 Duo T6670 is on rank 474, so the Core 2 Duo T6670 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Core i5-661
Performance Per Dollar Core 2 Duo T6670
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i5-661 | Core 2 Duo T6670 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($40) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Clarkdale (2010−2011) / 32 nm) | 🛑 Legacy (Penryn (2008−2011) / 45 nm) |
💎 Value Proposition
| Insight | Core i5-661 | Core 2 Duo T6670 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($40) | ✅ More affordable ($0) |
Performance Check
To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.
Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.
Technical Specifications
Side-by-side comparison of Core i5-661 and Core 2 Duo T6670
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.
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.
Processing Power
The Core i5-661 packs 2 cores / 4 threads, matching the Core 2 Duo T6670's 2 cores. Boost clocks reach 3.6 GHz on the Core i5-661 versus 2.2 GHz on the Core 2 Duo T6670 — a 48.3% clock advantage for the Core i5-661 (base: 3.33 GHz vs 2.2 GHz). The Core i5-661 uses the Clarkdale (2010−2011) architecture (32 nm), while the Core 2 Duo T6670 uses Penryn (2008−2011) (45 nm). In PassMark, the Core i5-661 scores 2,387 against the Core 2 Duo T6670's 2,365 — a 0.9% lead for the Core i5-661. L3 cache: 4 MB (total) on the Core i5-661 vs 2 MB L2 Cache on the Core 2 Duo T6670.
| Feature | Core i5-661 | Core 2 Duo T6670 |
|---|---|---|
| Cores / Threads | 2 / 4 | 2 / 2 |
| Boost Clock | 3.6 GHz+64% | 2.2 GHz |
| Base Clock | 3.33 GHz+51% | 2.2 GHz |
| L3 Cache | 4 MB (total)+100% | 2 MB L2 Cache |
| L2 Cache | 256 kB (per core) | 2 MB+700% |
| Process | 32 nm-29% | 45 nm |
| Architecture | Clarkdale (2010−2011) | Penryn (2008−2011) |
| PassMark | 2,387 | 2,365 |
| Geekbench 6 Single | — | 252 |
| Geekbench 6 Multi | — | 252 |
Memory & Platform
The Core i5-661 uses the LGA1156 socket (PCIe 2.0), while the Core 2 Duo T6670 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard.
| Feature | Core i5-661 | Core 2 Duo T6670 |
|---|---|---|
| Socket | LGA1156 | PGA478 |
| PCIe Generation | PCIe 2.0+82% | PCIe 1.1 |
| Max RAM Speed | — | DDR3-1066 |
| Max RAM Capacity | — | 8 GB |
| RAM Channels | — | 2 |
| ECC Support | — | ❌ |
| PCIe Lanes | — | 0 |
Advanced Features
Virtualization: not specified (Core i5-661) / VT-x (Core 2 Duo T6670). Primary use case: Core 2 Duo T6670 targets Budget. Direct competitor: Core 2 Duo T6670 rivals Core 2 Duo T6600.
| Feature | Core i5-661 | Core 2 Duo T6670 |
|---|---|---|
| Integrated GPU | — | No |
| Unlocked | — | No |
| AVX-512 | — | No |
| Virtualization | — | VT-x |
| Target Use | — | Budget |
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