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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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Much more l2 cache 4 MB vs 1 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 4 vs 2 Twice as many cores; run more applications at once
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Front view of Intel Core i3 530

Reasons to consider the
Intel Core i3 530

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 1.21 pt/W vs 0.94 pt/W Around 30% better performance per watt
Higher clock speed 2.93 GHz vs 2.66 GHz More than 10% higher clock speed
Much lower typical power consumption 92.5W vs 135.97W More than 30% lower typical power consumption
Much better overclocked clock speed (Air) 4.31 GHz vs 3.48 GHz Around 25% better overclocked clock speed (Air)
Much lower annual home energy cost 35.3 $/year vs 51.39 $/year More than 30% lower annual home energy cost
Much better overclocked clock speed (Water) 4.9 GHz vs 3.91 GHz More than 25% better overclocked clock speed (Water)
Much lower annual commercial energy cost 88.48 $/year vs 130.79 $/year More than 30% lower annual commercial energy cost
Higher Maximum operating temperature 72.6 °C vs 71.4 °C Almost the same
Newer Jan, 2010 vs Apr, 2009 Release date 8 months later

Benchmarks Real world tests of Core2 Quad Q8400 vs Core i3 530

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
Core i3 530
123,800 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
Core i3 530 
Clock speed 2.66 GHz 2.93 GHz
Cores Quad core Dual core
Socket type
LGA 775
LGA 1156

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 73W
Annual home energy cost 51.39 $/year 35.3 $/year
Annual commercial energy cost 130.79 $/year 88.48 $/year
Performance per watt 0.94 pt/W 1.21 pt/W
Idle power consumption 96W 67W
Peak power consumption 149.3W 101W
Typical power consumption 135.97W 92.5W

details

Core2 Quad Q8400  vs
Core i3 530 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 4 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 45 nm 32 nm
Transistor count 456,000,000 382,000,000
Max CPUs 1 1
Clock multiplier 8 22
Voltage range 0.85 - 1.36V 0.65 - 1.4V
Operating temperature Unknown - 71.4°C Unknown - 72.6°C

overclocking

Overclock popularity 29 13
Overclocked clock speed 3.48 GHz 4.31 GHz
Overclocked clock speed (Water) 3.91 GHz 4.9 GHz
Overclocked clock speed (Air) 3.48 GHz 4.31 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 733 MHz

bus

Architecture FSB DMI
Number of links 1 1
Intel Core2 Quad Q8400
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Intel Core i3 530
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