Core 2 Duo T6400 vs Phenom II X4 820
Core 2 Duo T6400
Phenom II X4 820
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 2 Duo T6400 is positioned at rank 49 and the Phenom II X4 820 is on rank 916, so the Core 2 Duo T6400 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Core 2 Duo T6400
Performance Per Dollar Phenom II X4 820
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core 2 Duo T6400 | Phenom II X4 820 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($50) |
| Longevity | 🛑 Legacy (Penryn (2008−2011) / 45 nm) | 🛑 Legacy (Deneb (2009−2011) / 45 nm) |
💎 Value Proposition
| Insight | Core 2 Duo T6400 | Phenom II X4 820 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($50) |
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 2 Duo T6400 and Phenom II X4 820
Core 2 Duo T6400
The Core 2 Duo T6400 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 GHz, with boost up to 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: 2,115 points. Launch price was $249.
Phenom II X4 820
The Phenom II X4 820 is manufactured by AMD. It was released in 1 September 2009 (16 years ago). It is based on the Deneb (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 2.8 GHz, with boost up to 2.8 GHz. L3 cache: 4 MB (total). L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 2,114 points. Launch price was $90.
Processing Power
The Core 2 Duo T6400 packs 2 cores / 2 threads, while the Phenom II X4 820 offers 4 cores / 4 threads — the Phenom II X4 820 has 2 more cores. Boost clocks reach 2 GHz on the Core 2 Duo T6400 versus 2.8 GHz on the Phenom II X4 820 — a 33.3% clock advantage for the Phenom II X4 820 (base: 2 GHz vs 2.8 GHz). The Core 2 Duo T6400 uses the Penryn (2008−2011) architecture (45 nm), while the Phenom II X4 820 uses Deneb (2009−2011) (45 nm). In PassMark, the Core 2 Duo T6400 scores 2,115 against the Phenom II X4 820's 2,114 — a 0% lead for the Core 2 Duo T6400. L3 cache: 2 MB L2 Cache on the Core 2 Duo T6400 vs 4 MB (total) on the Phenom II X4 820.
| Feature | Core 2 Duo T6400 | Phenom II X4 820 |
|---|---|---|
| Cores / Threads | 2 / 2 | 4 / 4+100% |
| Boost Clock | 2 GHz | 2.8 GHz+40% |
| Base Clock | 2 GHz | 2.8 GHz+40% |
| L3 Cache | 2 MB L2 Cache | 4 MB (total)+100% |
| L2 Cache | 2 MB+300% | 512 kB (per core) |
| Process | 45 nm | 45 nm |
| Architecture | Penryn (2008−2011) | Deneb (2009−2011) |
| PassMark | 2,115 | 2,114 |
| Geekbench 6 Single | 650 | — |
| Geekbench 6 Multi | 1,300 | — |
Memory & Platform
The Core 2 Duo T6400 uses the PGA478 socket (PCIe 1.1), while the Phenom II X4 820 uses AM3 (PCIe 2.0) — making them incompatible on the same motherboard.
| Feature | Core 2 Duo T6400 | Phenom II X4 820 |
|---|---|---|
| Socket | PGA478 | AM3 |
| PCIe Generation | PCIe 1.1 | PCIe 2.0+82% |
| Max RAM Speed | DDR2-800 | — |
| Max RAM Capacity | 8 GB | — |
| RAM Channels | 2 | — |
| ECC Support | ❌ | — |
| PCIe Lanes | 0 | — |
Advanced Features
Virtualization: No (Core 2 Duo T6400) / not specified (Phenom II X4 820). Primary use case: Core 2 Duo T6400 targets Mobile.
| Feature | Core 2 Duo T6400 | Phenom II X4 820 |
|---|---|---|
| Integrated GPU | No | — |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | No | — |
| Target Use | Mobile | — |
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