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Differences What are the advantages of each

Front view of Intel Core2 Quad Q8400S

Reasons to consider the
Intel Core2 Quad Q8400S

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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
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Much lower typical power consumption 52.81W vs 107.5W 2x lower typical power consumption
Much higher Maximum operating temperature 76.3 °C vs 67.4 °C Around 15% higher Maximum operating temperature
Much lower annual home energy cost 15.66 $/year vs 38.81 $/year 2.5x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 106 $/year More than 45% lower annual commercial energy cost
Front view of Intel Core i5 3570K

Reasons to consider the
Intel Core i5 3570K

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Much higher clock speed 3.4 GHz vs 2.66 GHz Around 30% higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.59 GHz vs 2.67 GHz More than 70% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.71 GHz vs 2.67 GHz More than 75% better overclocked clock speed (Water)
Newer Apr, 2012 vs Apr, 2009 Release date over 3 years later

Features Key features of the Core2 Quad Q8400S  vs Core i5 3570K 

clock speed

Core i5 3570K
3.4 GHz

L2 cache

overclocked clock speed (air)

Core i5 3570K
4.59 GHz

overclocked clock speed (water)

Core i5 3570K
4.71 GHz

Specifications Full list of technical specs

summary

Core2 Quad Q8400S  vs
Core i5 3570K 
Clock speed 2.66 GHz 3.4 GHz
Cores Quad core Quad core
Socket type
LGA 775
LGA 1155

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 77W
Annual home energy cost 15.66 $/year 38.81 $/year
Annual commercial energy cost 56.94 $/year 106 $/year
Typical power consumption 52.81W 107.5W

bus

Architecture FSB DMI
Number of links 1 1

details

Core2 Quad Q8400S  vs
Core i5 3570K 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 4 MB 1 MB
L2 cache per core 1 MB/core 0.25 MB/core
Manufacture process 45 nm 22 nm
Transistor count 456,000,000 1,400,000,000
Max CPUs 1 1
Clock multiplier 8 34
Operating temperature Unknown - 76.3°C Unknown - 67.4°C

overclocking

Overclocked clock speed 2.67 GHz 4.59 GHz
Overclocked clock speed (Water) 2.67 GHz 4.71 GHz
Overclocked clock speed (Air) 2.67 GHz 4.59 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 4000
Latest DirectX N/A 10.x
Number of displays supported N/A 3
GPU clock speed N/A 650 MHz
Turbo clock speed N/A 1,150 MHz
3DMark06 N/A 5,339.9
Intel Core2 Quad Q8400S
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Intel Core i5 3570K
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