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Differences What are the advantages of each

Front view of Intel Pentium D 820

Reasons to consider the
Intel Pentium D 820

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Much better geekbench 3 AES single core score 100,200 MB/s vs 24,800 MB/s More than 4x better geekbench 3 AES single core score
Significantly higher clock speed 2.8 GHz vs 1.6 GHz Around 75% higher clock speed
Much more l2 cache 2 MB vs 0.5 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Much better overclocked clock speed (Air) 3.52 GHz vs 1.87 GHz Around 90% 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
Much better performance per dollar 1.2 pt/$ vs 0.76 pt/$ Around 60% better performance per dollar
Better geekbench 3 Multi-Core score 1,378 vs 516 Around 2.8x better geekbench 3 Multi-Core score
Much better overclocked clock speed (Water) 4.25 GHz vs 1.6 GHz Around 2.8x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once
Front view of Intel Atom N270

Reasons to consider the
Intel Atom N270

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Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 2.03W vs 77.19W 38x lower typical power consumption
Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
Much better performance per watt 9.71 pt/W vs 0.94 pt/W More than 10.2x better performance per watt
Much lower annual home energy cost 0.6 $/year vs 22.89 $/year 38x lower annual home energy cost
Much lower annual commercial energy cost 2.19 $/year vs 83.22 $/year 38x lower annual commercial energy cost
Newer Jun, 2008 vs Apr, 2005 Release date over 3 years later

Benchmarks Real world tests of Pentium D 820 vs Atom N270

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 D 820
100,200 MB/s
Atom N270
24,800 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Specifications Full list of technical specs

summary

Pentium D 820  vs
Atom N270 
Clock speed 2.8 GHz 1.6 GHz
Cores Dual core Single core
Socket type
LGA 775
437

features

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

power consumption

TDP 95W 2.5W
Annual home energy cost 22.89 $/year 0.6 $/year
Annual commercial energy cost 83.22 $/year 2.19 $/year
Performance per watt 0.94 pt/W 9.71 pt/W
Typical power consumption 77.19W 2.03W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 800 MHz 533 MHz

details

Pentium D 820  vs
Atom N270 
Architecture x86-64 x86
Threads 2 2
L2 cache 2 MB 0.5 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 90 nm 45 nm
Transistor count 230,000,000 47,000,000
Max CPUs 1 1
Clock multiplier 14 12
Voltage range 1.2 - 1.4V 0.9 - 1.16V

overclocking

Overclocked clock speed 3.52 GHz 1.87 GHz
Overclocked clock speed (Water) 4.25 GHz 1.6 GHz
PassMark (Overclocked) 908.7 207.6
Overclocked clock speed (Air) 3.52 GHz 1.87 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
Intel Pentium D 820
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Intel Atom N270
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