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Differences What are the advantages of each

Front view of Intel Pentium T4400

Reasons to consider the
Intel Pentium T4400

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Much better geekbench 3 AES single core score 92,800 MB/s vs 15.6 MB/s Around 5948.8x better geekbench 3 AES single core score
Significantly higher clock speed 2.2 GHz vs 1 GHz Around 2.2x higher clock speed
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
More l2 cache 1 MB vs 0.5 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much better overclocked clock speed (Air) 2.51 GHz vs 1 GHz More than 2.5x better overclocked clock speed (Air)
Significantly better performance per dollar 0.67 pt/$ vs 0.3 pt/$ Around 2.2x better performance per dollar
Better geekbench 3 Multi-Core score 2,075 vs 308 Around 6.8x better geekbench 3 Multi-Core score
More cores 2 vs 1 Twice as many cores; run more applications at once
Significantly better overclocked clock speed (Water) 2.2 GHz vs 1 GHz Around 2.2x better overclocked clock speed (Water)
Front view of Intel Atom E640

Reasons to consider the
Intel Atom E640

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Significantly lower typical power consumption 2.92W vs 28.44W 9.7x lower typical power consumption
Significantly lower annual home energy cost 0.87 $/year vs 8.43 $/year 9.7x lower annual home energy cost
Significantly lower annual commercial energy cost 3.15 $/year vs 30.66 $/year 9.7x lower annual commercial energy cost
Newer Sep, 2010 vs Oct, 2009 Release date 11 months later

Benchmarks Real world tests of Pentium T4400 vs Atom E640

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 T4400
92,800 MB/s
Atom E640
15.6 MB/s

Specifications Full list of technical specs

summary

Pentium T4400  vs
Atom E640 
Clock speed 2.2 GHz 1 GHz
Cores Dual core Single core

features

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

power consumption

TDP 35W 3.6W
Annual home energy cost 8.43 $/year 0.87 $/year
Annual commercial energy cost 30.66 $/year 3.15 $/year
Performance per watt 2.56 pt/W 2.4 pt/W
Typical power consumption 28.44W 2.92W

details

Pentium T4400  vs
Atom E640 
Architecture x86-64 x86
Threads 2 2
L2 cache 1 MB 0.5 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Clock multiplier 11 10

overclocking

Overclocked clock speed 2.51 GHz 1 GHz
Overclocked clock speed (Water) 2.2 GHz 1 GHz
Overclocked clock speed (Air) 2.51 GHz 1 GHz

integrated graphics

GPU None GPU
Label N/A Integrated
GPU clock speed N/A 320 MHz

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 800 MHz 2,500 MHz
Intel Pentium T4400
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Intel Atom E640
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