Core 2 Quad Q8400

Details and Benchmarks for Intel Core 2 Quad Q8400

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Please take all results with a big grain of salt. Sysbuilds is in alpha stage at the moment which can lead to wrong data, strange counting errors, silly results and more. This site is under active development.

Benchmark Results

Combined benchmark scores based on multiple data points, giving a quick overview of this processor's performance.

Overall Score

Overall score for Core 2 Quad Q8400 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,223 Rank: 1639
Rank Name Score Visual
1635 Phenom II X4 810 4,224
+0%
1636 A4-5300 4,224
+0%
1637 Intel Core i3-380M 4,223
+0%
1638 FX-9800P 4,223
+0%
1639 Core 2 Quad Q8400 4,223
1640 Core 2 Duo T9300 4,222
+-0%
1641 Pentium G6950 4,221
+-0%
1642 Core 2 Duo P9500 4,221
+-0%
1643 Phenom II X4 820 4,220
-0.1%
1644 Phenom II X4 920 4,218
-0.1%

View full ranking →

Multicore Score

Multicore performance score for Core 2 Quad Q8400 based on multi-threaded benchmark results.

4,150 Rank: 2033
Rank Name Score Visual
2029 Xeon E3110 4,166
+0.4%
2030 Core 2 Quad Q9400 4,164
+0.3%
2031 Core i5-4300Y 4,161
+0.3%
2032 Core 2 Duo P8400 4,155
+0.1%
2033 Core 2 Quad Q8400 4,150
2034 Athlon II X2 250 4,149
+-0%
2035 A4-6320 4,143
-0.2%
2036 Core i3-3217U 4,143
-0.2%
2037 Phenom 9750 4,141
-0.2%
2038 Core i5-3317U 4,135
-0.4%

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Singlecore Score

Single-core performance score for Core 2 Quad Q8400 based on single-threaded benchmark results.

4,271 Rank: 1514
Rank Name Score Visual
1510 Athlon II X4 645 4,276
+0.1%
1511 Xeon W3505 4,276
+0.1%
1512 Core i5-560M 4,275
+0.1%
1513 A6-5357M 4,273
+0%
1514 Core 2 Quad Q8400 4,271
1515 A10-9620P 4,270
+-0%
1516 Core i5-4200U 4,266
-0.1%
1517 Core 2 Duo P9700 4,266
-0.1%
1518 Athlon II X4 640 4,264
-0.2%
1519 A4-5300B 4,263
-0.2%

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Workload Scores

Performance scores grouped by workload type, normalized and aggregated from multiple raw benchmark results.

Number Crunching

Aggregated score for Core 2 Quad Q8400 based on integer math, floating point math, and prime number computation benchmarks.

-- Rank: --

Number Crunching score not yet available.

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Data Processing

Aggregated score for Core 2 Quad Q8400 based on data encryption, data compression, and string sorting benchmarks.

-- Rank: --

Data Processing score not yet available.

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Physics & Compute

Aggregated score for Core 2 Quad Q8400 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

-- Rank: --

Physics & Compute score not yet available.

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Core 2 Quad Q8400 Details

The Intel Core 2 Quad Q8400, launched in April 2009, is a four-core desktop processor built on the Yorkfield architecture at a 45 nm process. With a base clock of 2.666 GHz and a TDP of 95 W, it represents a mid-tier offering from Intel’s Core 2 era, designed for mainstream desktop systems during a time when multi-threaded performance was becoming increasingly important. Though now considered obsolete, the Q8400 was notable for delivering robust multi-core performance for its time, particularly in tasks that could leverage its four cores effectively. As of March 2026, the processor is no longer relevant in modern computing environments, but it remains a benchmark point for understanding the evolution of multi-core desktop CPUs.

The Q8400 features a total of 4 cores and 4 threads, with no support for simultaneous multithreading, and operates with a locked clock multiplier, limiting its overclocking potential. It includes 4 MB of L2 cache, distributed as 1 MB per core, and supports DDR1, DDR2, and DDR3 memory types via a dual-channel memory bus. The processor is manufactured using a 45 nm process and contains 456 million transistors across a die area of 82 mm². It uses the Socket 775 interface and is packaged in FC-LGA6. While it lacks integrated graphics, certain motherboards with compatible chipsets can provide this functionality.

In terms of supported features, the Q8400 includes key technologies such as MMX, SSE, SSE2, SSE3, SSE4.1, and EIST (Enhanced SpeedStep Technology), which allow for efficient power management and improved multimedia performance. The processor’s memory bandwidth and PCIe Gen 2 support provide adequate connectivity for systems of its era.

Benchmarking data reveals that the Q8400 scores 4223 overall, ranking #1637 of 2060 processors in the dataset. Its single-core score of 4271 places it at #1514, while its multicore score of 4150 ranks it #2033. This indicates that the processor performs better in single-threaded workloads than in multi-threaded ones, a common trait for older CPUs where single-core performance was prioritized. Compared to its contemporaries, it slightly outperforms the Core 2 Duo P9700 and Core 2 Duo T9300 but trails behind higher-end models like the Core 2 Quad Q9400 and Xeon E3110.

The Q8400’s strongest category is single-core performance, where it ranks above many modern processors despite its age, showcasing the maturity of Intel’s 45 nm architecture. However, its multicore performance is weaker, placing it near the lower end of the spectrum in today’s benchmarks. This makes it suitable for basic computing tasks, light productivity, and older software but not ideal for modern applications, gaming, or content creation.

In summary, the Intel Core 2 Quad Q8400 is a relic of the late 2000s desktop market, offering decent single-threaded performance but limited multi-threaded capabilities by today’s standards. It serves as a historical reference point, illustrating the shift toward higher core counts and improved efficiency in modern processors. While not competitive in 2026, it remains a functional option for retro systems or educational use.
Frequently Compared

AMD A8-7200P 4 views

AMD Phenom II X2 555 3 views

AMD Ryzen 7 2700E 3 views

AMD Phenom II X3 710 3 views

AMD Athlon II X2 265 3 views

Intel Core 2 Duo E8600 3 views

AMD Ryzen 9 3900X 3 views

AMD A6-5400K 3 views

Intel Celeron G4920 3 views

AMD A9-9425 2 views

Intel Core 2 Quad Q8400

Main Specifications

Designer: Intel
Name: Core 2 Quad Q8400
Cores: 4
Threads: 4
Base Frequency: 2666 MHz
Clock Multiplier: 8x (locked)
Core Name: Yorkfield
Socket: Socket 775
Package: FC-LGA6
Target Segment: Desktop
TDP: 95 W

Cache Specifications

L1 Cache: 62.464 KiB
L2 Cache: 3.815 MiB

Memory Specifications

Supported Memory Type: DDR1, DDR2, DDR3

Physical Specifications

Process: 45 nm
Die Area: 82 mm²
Transistor Count: 0.00 billion
Manufacturer: Intel

CPU Features

MMX SSE SSE2 SSE3 SSE4.1 EIST
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