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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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CPUBoss is not aware of any important advantages of the Pentium D 820 vs the Core2 Duo E8400.

Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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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 better geekbench 2 (32-bit) score 2,826 vs 1,268 Around 2.2x better geekbench 2 (32-bit) score
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 1.83 pt/W vs 0.94 pt/W More than 95% better performance per watt
Higher clock speed 3 GHz vs 2.8 GHz More than 5% higher clock speed
Much better overclocked clock speed (Air) 4.22 GHz vs 3.52 GHz More than 20% better overclocked clock speed (Air)
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Much higher Maximum operating temperature 72.4 °C vs 64.1 °C Around 15% higher Maximum operating temperature
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost
Newer Jan, 2008 vs Apr, 2005 Release date over 2 years later

Benchmarks Real world tests of Pentium D 820 vs Core2 Duo E8400

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
Core2 Duo E8400
128,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

Specifications Full list of technical specs

summary

Pentium D 820  vs
Core2 Duo E8400 
Clock speed 2.8 GHz 3 GHz
Cores Dual core Dual core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
Has virtualization support No Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
Supplemental SSE3
Supports dynamic frequency scaling No Yes

power consumption

TDP 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Performance per watt 0.94 pt/W 1.83 pt/W
Typical power consumption 77.19W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 800 MHz 1,333 MHz

details

Pentium D 820  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 2 MB 6 MB
L2 cache per core 1 MB/core 3 MB/core
Manufacture process 90 nm 45 nm
Transistor count 230,000,000 410,000,000
Max CPUs 1 1
Clock multiplier 14 9
Voltage range 1.2 - 1.4V 0.85 - 1.36V
Operating temperature Unknown - 64.1°C Unknown - 72.4°C

overclocking

Overclock popularity 11 125
Overclocked clock speed 3.52 GHz 4.22 GHz
Overclocked clock speed (Water) 4.25 GHz 4.23 GHz
Overclocked clock speed (Air) 3.52 GHz 4.22 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 Core2 Duo E8400
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