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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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Much newer manufacturing process 32 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much better geekbench 2 (32-bit) score 3,343 vs 1,504 Around 2.2x better geekbench 2 (32-bit) score
Much better performance per watt 2.25 pt/W vs 0.78 pt/W Around 3x better performance per watt
Much lower typical power consumption 52.81W vs 105.63W 2x lower typical power consumption
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much lower annual commercial energy cost 56.94 $/year vs 113.88 $/year 2x lower annual commercial energy cost
Much lower annual home energy cost 15.66 $/year vs 31.32 $/year 2x lower annual home energy cost
Newer Jun, 2012 vs May, 2005 Release date over 7 years later
Front view of Intel Pentium 840

Reasons to consider the
Intel Pentium 840

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Much more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly higher clock speed 3.2 GHz vs 2.8 GHz Around 15% higher clock speed
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Air) 4.29 GHz vs 2.9 GHz Around 50% better overclocked clock speed (Air)
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Slightly higher Maximum operating temperature 69.8 °C vs 69.1 °C Almost the same
Significantly better overclocked clock speed (Water) 3.2 GHz vs 2.8 GHz Around 15% better overclocked clock speed (Water)

Benchmarks Real world tests of Pentium G640 vs 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

Pentium G640
137,650 MB/s
Pentium 840
114,300 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Specifications Full list of technical specs

summary

Pentium G640  vs
840 
Clock speed 2.8 GHz 3.2 GHz
Cores Dual core Dual core
Socket type
LGA 1155
LGA 775

features

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

power consumption

TDP 65W 130W
Annual home energy cost 15.66 $/year 31.32 $/year
Annual commercial energy cost 56.94 $/year 113.88 $/year
Performance per watt 2.25 pt/W 0.78 pt/W
Typical power consumption 52.81W 105.63W

bus

Architecture DMI FSB
Number of links 1 1

details

Pentium G640  vs
840 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 1 1
Clock multiplier 28 16
Operating temperature Unknown - 69.1°C Unknown - 69.8°C

overclocking

Overclocked clock speed 2.9 GHz 4.29 GHz
Overclocked clock speed (Water) 2.8 GHz 3.2 GHz
PassMark (Overclocked) 2,838.2 833.7
Overclocked clock speed (Air) 2.9 GHz 4.29 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

memory controller

Memory controller Built-in Built-in
Intel Pentium G640
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Intel Pentium 840
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