Core 2 Quad Q8400 vs Celeron M 585
Core 2 Quad Q8400
Celeron M 585
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 Quad Q8400 is positioned at rank 975 and the Celeron M 585 is on rank 430, so the Celeron M 585 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 Quad Q8400
Performance Per Dollar Celeron M 585
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core 2 Quad Q8400 | Celeron M 585 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($128) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Yorkfield (2007−2009) / 45 nm) | 🛑 Legacy (Merom (2006−2008) / 65 nm) |
💎 Value Proposition
| Insight | Core 2 Quad Q8400 | Celeron M 585 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($128) | ✅ 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 2 Quad Q8400 and Celeron M 585
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.
Celeron M 585
The Celeron M 585 is manufactured by Intel. It was released in 20 August 2008 (17 years ago). It is based on the Merom (2006−2008) architecture. It features 1 cores and 1 threads. Max frequency: 2.16 GHz. L2 cache: 1 MB. Built on 65 nm process technology. Socket: PGA478. Thermal design power (TDP): 1 MB. Passmark benchmark score: 2,062 points. Launch price was $70.
Processing Power
The Core 2 Quad Q8400 packs 4 cores / 4 threads, while the Celeron M 585 offers 1 cores / 1 threads — the Core 2 Quad Q8400 has 3 more cores. Boost clocks reach 0.67 GHz on the Core 2 Quad Q8400 versus 2.16 GHz on the Celeron M 585 — a 105.3% clock advantage for the Celeron M 585. The Core 2 Quad Q8400 uses the Yorkfield (2007−2009) architecture (45 nm), while the Celeron M 585 uses Merom (2006−2008) (65 nm). In PassMark, the Core 2 Quad Q8400 scores 2,076 against the Celeron M 585's 2,062 — a 0.7% lead for the Core 2 Quad Q8400.
| Feature | Core 2 Quad Q8400 | Celeron M 585 |
|---|---|---|
| Cores / Threads | 4 / 4+300% | 1 / 1 |
| Boost Clock | 0.67 GHz | 2.16 GHz+222% |
| Base Clock | 2.66 GHz | — |
| L3 Cache | 0 kB | — |
| L2 Cache | 4 MB (total)+300% | 1 MB |
| Process | 45 nm-31% | 65 nm |
| Architecture | Yorkfield (2007−2009) | Merom (2006−2008) |
| PassMark | 2,076 | 2,062 |
| Cinebench R23 Multi | 852 | — |
| Geekbench 6 Single | 369 | — |
| Geekbench 6 Multi | 1,155 | — |
Memory & Platform
The Core 2 Quad Q8400 uses the LGA775 socket (PCIe 1.1), while the Celeron M 585 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3 1333 MHz on the Core 2 Quad Q8400 versus 800 on the Celeron M 585 — the Core 2 Quad Q8400 supports 190% 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 — 120% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 0 PCIe lanes. Chipset compatibility: Intel P45,Intel G41,Intel Q45,Intel X48,Intel G31 (Core 2 Quad Q8400) and GL40,GM45 (Celeron M 585).
| Feature | Core 2 Quad Q8400 | Celeron M 585 |
|---|---|---|
| Socket | LGA775 | PGA478 |
| PCIe Generation | PCIe 1.1 | PCIe 1.1 |
| Max RAM Speed | DDR3 1333 MHz | 800+26567% |
| Max RAM Capacity | 16 GB+419430300% | 4 |
| RAM Channels | 2 | 2 |
| ECC Support | ❌ | ❌ |
| PCIe Lanes | 0 | 0 |
Advanced Features
Neither processor supports overclocking. Virtualization support: true (Core 2 Quad Q8400) vs false (Celeron M 585). Primary use case: Core 2 Quad Q8400 targets Desktop. Direct competitor: Celeron M 585 rivals Mobile Sempron SI-40.
| Feature | Core 2 Quad Q8400 | Celeron M 585 |
|---|---|---|
| Integrated GPU | No | No |
| IGPU Model | — | None |
| Unlocked | No | No |
| AVX-512 | No | No |
| Virtualization | true | false |
| Target Use | Desktop | — |
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