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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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Much better turbo clock speed 1,100 MHz vs 1,050 MHz Around 5% better turbo clock speed
Front view of Intel Pentium G2020

Reasons to consider the
Intel Pentium G2020

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Much newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 3.03 GHz vs 2.93 GHz Around 5% better overclocked clock speed (Air)
More number of displays supported 3 vs 2 1 more number of displays supported
Much better overclocked clock speed (Water) 3.1 GHz vs 2.8 GHz More than 10% better overclocked clock speed (Water)

Benchmarks Real world tests of Pentium G840 vs G2020

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 G2020
151,400 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

Pentium G840  vs
G2020 
Clock speed 2.8 GHz 2.9 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 55W
Annual home energy cost 27.42 $/year 13.25 $/year
Annual commercial energy cost 68.24 $/year 48.18 $/year
Performance per watt 1.93 pt/W 2.11 pt/W
Typical power consumption 71.53W 44.69W

bus

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

details

Pentium G840  vs
G2020 
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 22 nm
Max CPUs 1 1
Clock multiplier 28 29

overclocking

Overclocked clock speed 2.93 GHz 3.03 GHz
Overclocked clock speed (Water) 2.8 GHz 3.1 GHz
Overclocked clock speed (Air) 2.93 GHz 3.03 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics Intel® HD Graphics
Number of displays supported 2 3
GPU clock speed 850 MHz 650 MHz
Turbo clock speed 1,100 MHz 1,050 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 21,333.32 MB/s
Maximum memory size 32,768 MB 32,768 MB
Intel Pentium G840
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Intel Pentium G2020
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