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Differences What are the advantages of each

Front view of Intel Pentium G640

Reasons to consider the
Intel Pentium G640

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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
Newer Jun, 2012 vs Jan, 2008 Release date over 4 years later
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much more l2 cache 6 MB vs 1 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Much better overclocked clock speed (Air) 4.22 GHz vs 2.9 GHz More than 45% better overclocked clock speed (Air)
Higher clock speed 3 GHz vs 2.8 GHz More than 5% higher clock speed
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much more l2 cache per core 3 MB/core vs 0.5 MB/core 6x more l2 cache per core
Significantly higher Maximum operating temperature 72.4 °C vs 69.1 °C Around 5% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.23 GHz vs 2.8 GHz More than 50% better overclocked clock speed (Water)

Benchmarks Real world tests of Pentium G640 vs Core2 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

Pentium G640
137,650 MB/s
Core2 Duo E8400
128,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Pentium G640  vs
Core2 Duo E8400 
Clock speed 2.8 GHz 3 GHz
Cores Dual core Dual core
Socket type
LGA 1155
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
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 65W 65W
Annual home energy cost 15.66 $/year 15.66 $/year
Annual commercial energy cost 56.94 $/year 56.94 $/year
Performance per watt 2.25 pt/W 1.83 pt/W
Typical power consumption 52.81W 52.81W

details

Pentium G640  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 1 MB 6 MB
L2 cache per core 0.5 MB/core 3 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 1
Clock multiplier 28 9
Operating temperature Unknown - 69.1°C Unknown - 72.4°C

overclocking

Overclock popularity 0 125
Overclocked clock speed 2.9 GHz 4.22 GHz
Overclocked clock speed (Water) 2.8 GHz 4.23 GHz
Overclocked clock speed (Air) 2.9 GHz 4.22 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics N/A
Number of displays supported 2 N/A
GPU clock speed 850 MHz N/A
Turbo clock speed 1,100 MHz N/A

bus

Architecture DMI FSB
Number of links 1 1
Intel Pentium G640
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Intel Core2 Duo E8400
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