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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 Pentium 4 640.

Front view of Intel Pentium 4 640

Reasons to consider the
Intel Pentium 4 640

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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

Features Key features of the Pentium D 820  vs 4 640 

clock speed

Pentium D 820
2.8 GHz
Pentium 4 640
3.2 GHz

L2 cache

overclocked clock speed (air)

Pentium D 820
3.52 GHz
Pentium 4 640
3.92 GHz

overclocked clock speed (water)

Pentium D 820
4.25 GHz
Pentium 4 640
3.2 GHz

Specifications Full list of technical specs

summary

Pentium D 820  vs
4 640 
Clock speed 2.8 GHz 3.2 GHz
Cores Dual core Single core
Socket type
LGA 775

features

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

power consumption

TDP 95W 84W
Annual home energy cost 22.89 $/year 20.24 $/year
Annual commercial energy cost 83.22 $/year 73.58 $/year
Typical power consumption 77.19W 68.25W

bus

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

details

Pentium D 820  vs
4 640 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 2 MB 2 MB
L2 cache per core 1 MB/core 2 MB/core
Manufacture process 90 nm 90 nm
Transistor count 230,000,000 169,000,000
Max CPUs 1 1
Clock multiplier 14 16
Voltage range 1.2 - 1.4V 1.2 - 1.4V
Operating temperature Unknown - 64.1°C Unknown - 66.6°C

overclocking

Overclocked clock speed 3.52 GHz 3.92 GHz
Overclocked clock speed (Water) 4.25 GHz 3.2 GHz
PassMark (Overclocked) 908.7 844.2
Overclocked clock speed (Air) 3.52 GHz 3.92 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 Pentium 4 640
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Comments

Showing 1 comment.
How much better performance can I reasonably expect from two real cores vs. the hyperthreaded single core? That's the only advantage, if any, of going to Pentium D.
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