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Differences What are the advantages of each

Front view of Intel Pentium G840

Reasons to consider the
Intel Pentium G840

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Slightly better overclocked clock speed (Air) 2.93 GHz vs 2.9 GHz Almost the same
Front view of Intel Pentium G640

Reasons to consider the
Intel Pentium G640

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Significantly lower typical power consumption 52.81W vs 71.53W More than 25% lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 27.42 $/year Around 45% lower annual home energy cost
Lower annual commercial energy cost 56.94 $/year vs 68.24 $/year More than 15% lower annual commercial energy cost
Newer Jun, 2012 vs Apr, 2011 Release date over 1 years later

Benchmarks Real world tests of Pentium G840 vs G640

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 G840
138,400 MB/s
Pentium G640
137,650 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 G840  vs
G640 
Clock speed 2.8 GHz 2.8 GHz
Cores Dual core Dual core
Socket type
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
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 65W
Annual home energy cost 27.42 $/year 15.66 $/year
Annual commercial energy cost 68.24 $/year 56.94 $/year
Performance per watt 1.93 pt/W 2.25 pt/W
Typical power consumption 71.53W 52.81W

bus

Architecture DMI DMI
Number of links 1 1
Transfer rate 5,000 MT/s 5,000 MT/s

details

Pentium G840  vs
G640 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 3 MB 3 MB
L3 cache per core 1.5 MB/core 1.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 1 1
Clock multiplier 28 28
Operating temperature Unknown - 69.1°C Unknown - 69.1°C

overclocking

Overclocked clock speed 2.93 GHz 2.9 GHz
Overclocked clock speed (Water) 2.8 GHz 2.8 GHz
Overclocked clock speed (Air) 2.93 GHz 2.9 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics Intel® HD Graphics
Number of displays supported 2 2
GPU clock speed 850 MHz 850 MHz
Turbo clock speed 1,100 MHz 1,100 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Maximum bandwidth 21,333.32 MB/s 17,066.66 MB/s
Maximum memory size 32,768 MB 32,768 MB
Intel Pentium G840
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Intel Pentium G640
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