Athlon II X4 638 vs Core 2 Quad Q9400

VS

Aggregate performance score

Core 2 Quad Q9400
2008
4 cores / 4 threads, 95 Watt
1.35
Athlon II X4 638
2012
4 cores / 4 threads, 65 Watt
1.42
+5.2%

Athlon II X4 638 outperforms Core 2 Quad Q9400 by a small 5% based on our aggregate benchmark results.

Primary details

Comparing Core 2 Quad Q9400 and Athlon II X4 638 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking22562210
Place by popularitynot in top-100not in top-100
Market segmentDesktop processorDesktop processor
Power efficiency1.342.07
Architecture codenameYorkfield (2007−2009)Llano (2011−2012)
Release dateAugust 2008 (16 years ago)6 February 2012 (12 years ago)

Detailed specifications

Core 2 Quad Q9400 and Athlon II X4 638 basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores4 (Quad-Core)4 (Quad-Core)
Threads44
Base clock speed2.66 GHz2.7 GHz
Boost clock speed2.67 GHz2.7 GHz
Bus rate1333 MHzno data
L1 cache64K (per core)128 KB (per core)
L2 cache6 MB (shared)1 MB (per core)
L3 cache0 KB0 KB
Chip lithography45 nm32 nm
Die size2x 81 mm2228 mm2
Maximum case temperature (TCase)71 °Cno data
Number of transistors456 million1,178 million
64 bit support++
Windows 11 compatibility--
VID voltage range0.85V-1.3625Vno data

Compatibility

Information on Core 2 Quad Q9400 and Athlon II X4 638 compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration11
SocketLGA775FM1
Power consumption (TDP)95 Watt65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Quad Q9400 and Athlon II X4 638. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)+no data
Turbo Boost Technology-no data
Hyper-Threading Technology-no data
Idle States+no data
Thermal Monitoring+-
Demand Based Switching-no data
FSB parity-no data

Security technologies

Core 2 Quad Q9400 and Athlon II X4 638 technologies aimed at improving security, for example, by protecting against hacks.

TXT+no data
EDB+no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Quad Q9400 and Athlon II X4 638 are enumerated here.

AMD-V-+
VT-d+no data
VT-x+no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q9400 and Athlon II X4 638. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR1, DDR2, DDR3DDR3

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Core 2 Quad Q9400 1.35
Athlon II X4 638 1.42
+5.2%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Core 2 Quad Q9400 2138
Athlon II X4 638 2250
+5.2%

Gaming performance

Pros & cons summary


Performance score 1.35 1.42
Chip lithography 45 nm 32 nm
Power consumption (TDP) 95 Watt 65 Watt

Athlon II X4 638 has a 5.2% higher aggregate performance score, a 40.6% more advanced lithography process, and 46.2% lower power consumption.

Given the minimal performance differences, no clear winner can be declared between Core 2 Quad Q9400 and Athlon II X4 638.


Should you still have questions on choice between Core 2 Quad Q9400 and Athlon II X4 638, ask them in Comments section, and we shall answer.

Vote for your favorite

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Intel Core 2 Quad Q9400
Core 2 Quad Q9400
AMD Athlon II X4 638
Athlon II X4 638

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Community ratings

Here you can see how users rate the processors, as well as rate them yourself.


4.3 1573 votes

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3.1 34 votes

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Questions & comments

Here you can ask a question about Core 2 Quad Q9400 or Athlon II X4 638, agree or disagree with our judgements, or report an error or mismatch.