CPUBoss Review Our evaluation of Q8400 vs E8400 among desktop CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

No winner declared

Too close to call

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VS

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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More threads 4 vs 2 Twice as many threads
More cores 4 vs 2 Twice as many cores; run more applications at once
Better PassMark score 3,234 vs 2,172 Around 50% better PassMark score
Significantly better cinebench r10 32Bit score 11,577 vs 7,187 More than 60% better cinebench r10 32Bit score
Newer Apr, 2009 vs Jan, 2008 Release date over 1 years later
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Higher clock speed 3 GHz vs 2.66 GHz Around 15% higher clock speed
More l2 cache 6 MB vs 4 MB 50% more l2 cache; more data can be stored in the l2 cache for quick access later
Much lower typical power consumption 52.81W vs 135.98W 2.6x lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much more l2 cache per core 3 MB/core vs 1 MB/core 3x more l2 cache per core
Much better performance per dollar 10.84 pt/$ vs 1.39 pt/$ More than 7.8x better performance per dollar
Much better cinebench r10 32Bit 1-core score 3,647 vs 3,198 Around 15% better cinebench r10 32Bit 1-core score
Better overclocked clock speed (Air) 4.23 GHz vs 3.46 GHz Around 25% better overclocked clock speed (Air)
Much lower annual home energy cost 15.66 $/year vs 51.39 $/year 3.3x lower annual home energy cost
Better geekbench 3 single core score 1,625 vs 1,465 More than 10% better geekbench 3 single core score
Much lower annual commercial energy cost 56.94 $/year vs 130.79 $/year 2.3x lower annual commercial energy cost
Slightly higher Maximum operating temperature 72.4 °C vs 71.4 °C Almost the same
Slightly better performance per watt 2.34 pt/W vs 1.12 pt/W More than 2x better performance per watt
Better overclocked clock speed (Water) 4.21 GHz vs 3.77 GHz More than 10% better overclocked clock speed (Water)

Benchmarks Real world tests of Core2 Quad Q8400 vs Duo E8400

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
Core2 Duo E8400
128,000 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
Duo E8400 
Clock speed 2.66 GHz 3 GHz
Cores Quad core Dual core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 65W
Annual home energy cost 51.39 $/year 15.66 $/year
Annual commercial energy cost 130.79 $/year 56.94 $/year
Performance per watt 1.12 pt/W 2.34 pt/W
Typical power consumption 135.98W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 1,333 MHz 1,333 MHz

details

Core2 Quad Q8400  vs
Duo E8400 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 4 MB 6 MB
L2 cache per core 1 MB/core 3 MB/core
Manufacture process 45 nm 45 nm
Transistor count 456,000,000 410,000,000
Max CPUs 1 1
Clock multiplier 8 9
Voltage range 0.85 - 1.36V 0.85 - 1.36V
Operating temperature Unknown - 71.4°C Unknown - 72.4°C

overclocking

Overclock popularity 29 125
Overclocked clock speed 3.46 GHz 4.23 GHz
Overclocked clock speed (Water) 3.77 GHz 4.21 GHz
Overclocked clock speed (Air) 3.46 GHz 4.23 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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Intel Core2 Duo E8400
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