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Differences What are the advantages of each

Front view of Intel Pentium 840

Reasons to consider the
Intel Pentium 840

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More threads 4 vs 2 Twice as many threads
Higher clock speed 3.2 GHz vs 3 GHz More than 5% higher clock speed
Better overclocked clock speed (Air) 4.29 GHz vs 4.22 GHz Almost the same
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 1,504 Around 90% better geekbench 2 (32-bit) score
Much better performance per watt 1.83 pt/W vs 0.78 pt/W More than 2.2x better performance per watt
Much lower typical power consumption 52.81W vs 105.63W 2x lower typical power consumption
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
Higher Maximum operating temperature 72.4 °C vs 69.8 °C Around 5% higher Maximum operating temperature
Much lower annual commercial energy cost 56.94 $/year vs 113.88 $/year 2x lower annual commercial energy cost
Much lower annual home energy cost 15.66 $/year vs 31.32 $/year 2x lower annual home energy cost
Much better overclocked clock speed (Water) 4.23 GHz vs 3.2 GHz More than 30% better overclocked clock speed (Water)
Newer Jan, 2008 vs May, 2005 Release date over 2 years later

Benchmarks Real world tests of Pentium 840 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 840
114,300 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 840  vs
Core2 Duo E8400 
Clock speed 3.2 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 Yes Yes

power consumption

TDP 130W 65W
Annual home energy cost 31.32 $/year 15.66 $/year
Annual commercial energy cost 113.88 $/year 56.94 $/year
Performance per watt 0.78 pt/W 1.83 pt/W
Typical power consumption 105.63W 52.81W

bus

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

details

Pentium 840  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 4 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 16 9
Voltage range 1.2 - 1.4V 0.85 - 1.36V
Operating temperature Unknown - 69.8°C Unknown - 72.4°C

overclocking

Overclocked clock speed 4.29 GHz 4.22 GHz
Overclocked clock speed (Water) 3.2 GHz 4.23 GHz
Overclocked clock speed (Air) 4.29 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 840
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Intel Core2 Duo E8400
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