Celeron B815 vs Core 2 Duo T6400
Celeron B815
Core 2 Duo T6400
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 Celeron B815 is positioned at rank 799 and the Core 2 Duo T6400 is on rank 49, 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 Celeron B815
Performance Per Dollar Core 2 Duo T6400
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Celeron B815 | Core 2 Duo T6400 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($15) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Sandy Bridge (2011−2013) / 32 nm) | 🛑 Legacy (Penryn (2008−2011) / 45 nm) |
💎 Value Proposition
| Insight | Celeron B815 | Core 2 Duo T6400 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($15) | ✅ 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 Celeron B815 and Core 2 Duo T6400
Celeron B815
The Celeron B815 is manufactured by Intel. It was released in 1 January 2012 (13 years ago). It is based on the Sandy Bridge (2011−2013) architecture. It features 2 cores and 2 threads. Base frequency is 1.6 GHz, with boost up to 1.6 GHz. L3 cache: 2 MB (total). L2 cache: 256K (per core). Built on 32 nm process technology. Socket: PGA988. Thermal design power (TDP): 35 Watt. Memory support: DDR3. Passmark benchmark score: 2,093 points. Launch price was $86.
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.
Processing Power
Both the Celeron B815 and Core 2 Duo T6400 share an identical 2-core/2-thread configuration. Boost clocks reach 1.6 GHz on the Celeron B815 versus 2 GHz on the Core 2 Duo T6400 — a 22.2% clock advantage for the Core 2 Duo T6400 (base: 1.6 GHz vs 2 GHz). The Celeron B815 uses the Sandy Bridge (2011−2013) architecture (32 nm), while the Core 2 Duo T6400 uses Penryn (2008−2011) (45 nm). In PassMark, the Celeron B815 scores 2,093 against the Core 2 Duo T6400's 2,115 — a 1% lead for the Core 2 Duo T6400. L3 cache: 2 MB (total) on the Celeron B815 vs 2 MB L2 Cache on the Core 2 Duo T6400.
| Feature | Celeron B815 | Core 2 Duo T6400 |
|---|---|---|
| Cores / Threads | 2 / 2 | 2 / 2 |
| Boost Clock | 1.6 GHz | 2 GHz+25% |
| Base Clock | 1.6 GHz | 2 GHz+25% |
| L3 Cache | 2 MB (total) | 2 MB L2 Cache |
| L2 Cache | 256K (per core) | 2 MB+700% |
| Process | 32 nm-29% | 45 nm |
| Architecture | Sandy Bridge (2011−2013) | Penryn (2008−2011) |
| PassMark | 2,093 | 2,115+1% |
| Geekbench 6 Single | — | 650 |
| Geekbench 6 Multi | — | 1,300 |
Memory & Platform
The Celeron B815 uses the PGA988 socket (PCIe 2.0), while the Core 2 Duo T6400 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Celeron B815 versus DDR2-800 on the Core 2 Duo T6400 — the Celeron B815 supports 40% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Celeron B815 supports up to 16 GB of RAM compared to 8 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Celeron B815) vs 0 (Core 2 Duo T6400) — the Celeron B815 offers 16 more lanes for additional GPUs or NVMe drives. Chipset compatibility: HM65,HM67,QM67,QM77 (Celeron B815) and Intel GM45,Intel PM45 (Core 2 Duo T6400).
| Feature | Celeron B815 | Core 2 Duo T6400 |
|---|---|---|
| Socket | PGA988 | PGA478 |
| PCIe Generation | PCIe 2.0+82% | PCIe 1.1 |
| Max RAM Speed | DDR3-1333+50% | DDR2-800 |
| Max RAM Capacity | 16 GB+100% | 8 GB |
| RAM Channels | 2 | 2 |
| ECC Support | ❌ | ❌ |
| PCIe Lanes | 16 | 0 |
Advanced Features
Neither processor supports overclocking. Virtualization support: VT-x (Celeron B815) vs No (Core 2 Duo T6400). The Celeron B815 includes integrated graphics (HD Graphics (Sandy Bridge)), while the Core 2 Duo T6400 requires a dedicated GPU. Primary use case: Celeron B815 targets Budget, Core 2 Duo T6400 targets Mobile. Direct competitor: Celeron B815 rivals Pentium 967.
| Feature | Celeron B815 | Core 2 Duo T6400 |
|---|---|---|
| Integrated GPU | Yes | No |
| IGPU Model | HD Graphics (Sandy Bridge) | — |
| Unlocked | No | No |
| AVX-512 | No | No |
| Virtualization | VT-x | No |
| Target Use | Budget | Mobile |
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