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Differences What are the advantages of each

Front view of Intel Pentium J2900

Reasons to consider the
Intel Pentium J2900

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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
Much lower typical power consumption 8.13W vs 71.53W 8.8x lower typical power consumption
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower annual home energy cost 2.41 $/year vs 27.42 $/year 11.4x lower annual home energy cost
Much lower annual commercial energy cost 8.76 $/year vs 68.24 $/year 7.8x lower annual commercial energy cost
Newer Oct, 2013 vs Apr, 2011 Release date over 2 years later
Front view of Intel Pentium G840

Reasons to consider the
Intel Pentium G840

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Much better PassMark (Single core) score 1,458 vs 590 Around 2.5x better PassMark (Single core) score
Significantly higher clock speed 2.8 GHz vs 2.41 GHz More than 15% higher clock speed
Much better turbo clock speed 1,100 MHz vs 896 MHz Around 25% better turbo clock speed
Supports more RAM 32,768 MB vs 8,192 MB Supports 4x more RAM
Significantly better overclocked clock speed (Air) 2.93 GHz vs 2.67 GHz Around 10% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 2.8 GHz vs 2.66 GHz More than 5% better overclocked clock speed (Water)

Benchmarks Real world tests of Pentium J2900 vs G840

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 J2900
62,700 MB/s
Pentium G840
138,400 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Pentium J2900  vs
G840 
Clock speed 2.41 GHz 2.8 GHz
Cores Quad core Dual core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Supports dynamic frequency scaling Yes Yes

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics Intel® HD Graphics
Number of displays supported 2 2
GPU clock speed 688 MHz 850 MHz
Turbo clock speed 896 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 12,800 MB/s 21,333.32 MB/s
Maximum memory size 8,192 MB 32,768 MB

details

Pentium J2900  vs
G840 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 2 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 22 nm 32 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.67 GHz 2.93 GHz
Overclocked clock speed (Water) 2.66 GHz 2.8 GHz
Overclocked clock speed (Air) 2.67 GHz 2.93 GHz

power consumption

TDP 10W 65W
Annual home energy cost 2.41 $/year 27.42 $/year
Annual commercial energy cost 8.76 $/year 68.24 $/year
Performance per watt 6.24 pt/W 1.93 pt/W
Typical power consumption 8.13W 71.53W

bus

Architecture FSB DMI
Number of links 1 1
Intel Pentium J2900
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Intel Pentium G840
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