INTEL

Intel Core 2 Quad Q8400

Intel processor specifications and benchmark scores

4
Cores
4
Threads
GHz Boost
95W
TDP
🖥️Integrated GPU

Intel Core 2 Quad Q8400 Specifications

⚙️

Core 2 Quad Q8400 Core Configuration

Processing cores and threading

The Intel Core 2 Quad Q8400 features 4 physical cores and 4 threads, which directly impacts multi-threaded performance in CPU benchmarks. More cores allow the processor to handle parallel workloads efficiently, improving performance in video editing, 3D rendering, and multitasking scenarios. Thread count determines how many simultaneous tasks the CPU can process, with higher thread counts benefiting productivity applications and content creation workflows.

Cores
4
Threads
4
SMP CPUs
1
⏱️

2 Quad Q8400 Clock Speeds

Base and boost frequencies

Clock speed is a critical factor in Core 2 Quad Q8400 benchmark performance, measured in GHz. The base clock represents the guaranteed operating frequency, while the boost clock indicates maximum single-core performance under optimal conditions. Higher clock speeds translate to faster single-threaded performance, which is essential for gaming and applications that don't fully utilize multiple cores. The Core 2 Quad Q8400 by Intel can dynamically adjust its frequency based on workload and thermal headroom.

Base Clock
2.67 GHz
Boost Clock
N/A
Multiplier
8x
💾

Intel's Core 2 Quad Q8400 Cache Hierarchy

L1, L2, L3 cache sizes

Cache memory is ultra-fast storage built directly into the 2 Quad Q8400 processor die. L1 cache provides the fastest access for frequently used data, while L2 and L3 caches offer progressively larger storage with slightly higher latency. Larger cache sizes significantly improve CPU benchmark scores by reducing memory access times. The Core 2 Quad Q8400's cache configuration is optimized for both gaming performance and productivity workloads, minimizing data fetch delays during intensive computations.

L1 Cache
64 KB (per core)
L2 Cache
4 MB (shared)
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Core 2 Architecture & Process

Manufacturing and design details

The Intel Core 2 Quad Q8400 is built on Intel's 45 nm manufacturing process, which determines power efficiency and thermal characteristics. Smaller process nodes allow for more transistors in the same space, enabling higher performance per watt. The architecture defines how the processor handles instructions and manages data flow, directly impacting benchmark results across different workload types. Modern CPU architectures like the one in 2 Quad Q8400 incorporate advanced branch prediction and out-of-order execution for optimal performance.

Architecture
Core 2
Codename
Yorkfield
Process Node
45 nm
Foundry
Intel
Transistors
456 million
Die Size
2x 82 mm²
Generation
Core 2 Quad (Yorkfield)
🔢

Core 2 Instruction Set Features

Supported CPU instructions and extensions

The Core 2 Quad Q8400 by Intel supports various instruction set extensions that enable optimized performance for specific workloads. SIMD instructions like SSE and AVX accelerate multimedia, scientific computing, and AI workloads by processing multiple data points simultaneously. Features like AES-NI provide hardware-accelerated encryption, while AVX-512 (if supported) enables advanced vector processing for data centers and high-performance computing. These instruction sets are critical for software compatibility and performance in modern applications.

MMX
SSE
SSE2
SSE3
SSSE3
SSE4.1
Intel 64
VT-x
🔌

2 Quad Q8400 Power & Thermal

TDP and power specifications

The Intel Core 2 Quad Q8400 has a TDP (Thermal Design Power) of 95W, indicating the cooling solution required for sustained operation. TDP affects both system power consumption and the type of cooler needed. Lower TDP processors are ideal for compact builds and laptops, while higher TDP chips typically offer better sustained performance in demanding CPU benchmarks. Understanding power requirements helps ensure your system can deliver consistent performance without thermal throttling.

TDP
95W
🔧

Intel Socket 775 Platform & Socket

Compatibility information

The Core 2 Quad Q8400 uses the Intel Socket 775 socket, which determines motherboard compatibility. Choosing the right platform is essential for building a system around this processor. The socket type also influences available features like PCIe lanes, memory support, and upgrade paths. When comparing CPU benchmarks, ensure you're looking at processors compatible with your existing or planned motherboard to make informed purchasing decisions.

Socket
Intel Socket 775
PCIe
Gen 2
Package
FC-LGA6
DDR5

Intel Socket 775 Memory Support

RAM compatibility and speeds

Memory support specifications for the 2 Quad Q8400 define which RAM types and speeds are compatible. Faster memory can significantly improve CPU benchmark performance, especially in memory-intensive applications and gaming. The memory controller integrated into the Core 2 Quad Q8400 determines maximum supported speeds and channels. Dual-channel or quad-channel memory configurations can double or quadruple memory bandwidth, providing noticeable performance gains in content creation and scientific workloads.

Memory Type
DDR1, DDR2, DDR3
Memory Bus
Dual-channel
🖥️

Intel's Core 2 Quad Q8400 Integrated Graphics

Built-in GPU specifications

The Intel Core 2 Quad Q8400 includes integrated graphics, eliminating the need for a dedicated GPU in basic computing scenarios. Integrated graphics are ideal for office productivity, video playback, and light gaming. While not designed for demanding GPU benchmarks, the iGPU in the 2 Quad Q8400 provides hardware video encoding and decoding capabilities. This makes the processor suitable for compact builds, HTPCs, and systems where power efficiency is prioritized over gaming performance.

iGPU
On certain motherboards (Chipset feature)
Graphics Model
On certain motherboards (Chipset feature)
📦

Core 2 Quad Q8400 Product Information

Release and pricing details

The Intel Core 2 Quad Q8400 is manufactured by Intel and represents their commitment to delivering competitive CPU performance. Understanding the release date and pricing helps contextualize benchmark comparisons with other processors from the same generation. Launch pricing provides a baseline for evaluating value, though street prices often differ. Whether you're building a new system or upgrading, the Core 2 Quad Q8400 by Intel offers a specific balance of performance, features, and cost within Intel's product lineup.

Manufacturer
Intel
Release Date
Apr 2009
Market
Desktop
Status
End-of-life
Part Number
SLGT6

Core 2 Quad Q8400 Benchmark Scores

📊

No benchmark data available for this CPU.

About Intel Core 2 Quad Q8400

The Intel Core 2 Quad Q8400, a Yorkfield-based quad-core processor from 2009, is built on a mature 45nm process and features a monolithic dual-die design where two Core 2 Duo dies share a single LGA775 package. Its four physical cores operate at a base frequency of 2.66GHz without Turbo Boost technology, which was not a feature of this generation, meaning its performance is strictly defined by this clock speed across all workloads. This Q8400 CPU carries a 95W TDP, a figure that was standard for mainstream quad-cores of its era but is considered high by modern efficiency standards. Its cache hierarchy includes 64KB of L1 and 4MB of shared L2 cache per pair of cores, totaling 8MB, but it lacks any L3 cache entirely, a defining architectural limitation that impacted its data throughput compared to later Nehalem and subsequent architectures.

In practical application, the Core 2 Quad Q8400's performance profile makes it suitable for light productivity tasks and legacy gaming titles from its release period, struggling with modern, heavily multi-threaded games and applications due to its lack of simultaneous multithreading and lower per-core performance. The energy efficiency of this 95-watt processor is notably poor when measured against any modern platform, as it requires a dedicated chipset and DDR2 or early DDR3 memory, all contributing to a system-level power draw that offers little computational return by today's metrics. For users maintaining period-correct systems, this Yorkfield chip can still handle basic office work, web browsing, and older titles that rely more on single-threaded performance, though it is completely outclassed by even entry-level contemporary processors. Ultimately, the Intel Core 2 Quad model Q8400 stands as a historical milestone in bringing quad-core computing to the mainstream, but its relevance is now confined to very specific upgrade scenarios for aging LGA775 systems or as a component in retro computing builds.

The AMD Equivalent of Core 2 Quad Q8400

Looking for a similar processor from AMD? The AMD Ryzen 5 1400 offers comparable performance and features in the AMD lineup.

AMD Ryzen 5 1400

AMD • 4 Cores

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