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Differences What are the advantages of each

Front view of Intel Core2 Quad Q8400

Reasons to consider the
Intel Core2 Quad Q8400

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CPUBoss is not aware of any important advantages of the Intel Core2 Quad Q8400 vs the AMD Phenom II X4 840.

Front view of AMD Phenom II X4 840

Reasons to consider the
AMD Phenom II X4 840

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CPUBoss is not aware of any important advantages of the AMD Phenom II X4 840 vs the Intel Core2 Quad Q8400.

Benchmarks Real world tests of Core2 Quad Q8400 vs Phenom II X4 840

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core2 Quad Q8400
113,900 MB/s
Phenom II X4 840
129,500 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Quad Q8400  vs
Phenom II X4 840 
Clock speed 2.66 GHz 3.2 GHz
Cores Quad core Quad core
Socket type
LGA 775
AM3

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
SSE4.1
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 95W
Annual home energy cost 51.39 $/year 22.89 $/year
Annual commercial energy cost 130.79 $/year 83.22 $/year
Performance per watt 0.94 pt/W 1.87 pt/W
Typical power consumption 135.97W 77.19W

bus

Clock speed 1,333 MHz 2,000 MHz

details

Core2 Quad Q8400  vs
Phenom II X4 840 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 4 MB 2 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Voltage range 0.85 - 1.36V 0.85 - 1.4V
Operating temperature Unknown - 71.4°C Unknown - 71°C

overclocking

Overclock popularity 29 37
Overclocked clock speed 3.48 GHz 3.94 GHz
Overclocked clock speed (Water) 3.91 GHz 3.2 GHz
Overclocked clock speed (Air) 3.48 GHz 3.94 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
Intel Core2 Quad Q8400
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AMD Phenom II X4 840
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