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Differences What are the advantages of each

Front view of Intel Pentium D 830

Reasons to consider the
Intel Pentium D 830

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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
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Better overclocked clock speed (Air) 3.72 GHz vs 3.21 GHz More than 15% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 4.35 GHz vs 3.29 GHz More than 30% better overclocked clock speed (Water)
Lower annual home energy cost 31.32 $/year vs 37.88 $/year More than 15% lower annual home energy cost
Front view of Intel Core i3 2100

Reasons to consider the
Intel Core i3 2100

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Newer manufacturing process 32 nms vs 90 nms A newer manufacturing process allows for a more powerful, yet cooler running processor
Is hyperthreaded Yes vs No Somewhat common; Maximizes usage of each CPU core
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Has vitualization support Yes vs No Somewhat common; Boosts performance of virtual machines
More threads 4 vs 2 Twice as many threads
Marginally newer Jan, 2011 vs Apr, 2005 Release date over 5 years later
Better performance per watt 4.69 pt/W vs 1.56 pt/W More than 3x better performance per watt
Slightly lower typical power consumption 98.28W vs 105.63W More than 5% lower typical power consumption
Lower annual commercial energy cost 93.47 $/year vs 113.88 $/year Around 20% lower annual commercial energy cost

Features Key features of the Pentium D 830  vs Core i3 2100 

clock speed

Core i3 2100
3.1 GHz
The way the speed is worked out is by multiplying the host clock by 0.5 and then by the multiplier.
Core i3 2100 | by Tech Radar (Apr, 2011)

L2 cache

The Core i3-2100 is loaded with 3MB of cache, as well as Intel HD Graphics 2000 for integrated video—this is the lesser of the two Sandy Bridge integrated video options, but it will provide some power and support for DirectX 10.1 (DX10.1), if not DX11, 3D.
Core i3 2100 | by PCMag (Aug, 2011)

overclocked clock speed (air)

Pentium D 830
3.72 GHz
Core i3 2100
3.21 GHz
This, together with its lack of overclocking features, means it's very much the poor relation of the family when it comes to performance.
Core i3 2100 | by Tech Radar (Apr, 2011)

overclocked clock speed (water)

Pentium D 830
4.35 GHz
Core i3 2100
3.29 GHz
The HD2000 is the only part of the core that can be overclocked, which is achieved by tweaking the graphics multiplier in the BIOS.
Core i3 2100 | by Tech Radar (Apr, 2011)

TDP

With a maximum TDP of 65 watts, this processor is also not much of an energy hog.
Core i3 2100 | by PCMag (Aug, 2011)

Specifications Full list of technical specs

summary

Pentium D 830  vs
Core i3 2100 
Clock speed 3 GHz 3.1 GHz
Cores Dual core Dual core
Socket type
LGA 775
LGA 1155
Is hyperthreaded No Yes

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has vitualization support No Yes
Instruction-set-extensions
MMX
SSE
SSE4.2
AVX
SSE3
SSE2
Supplemental SSE3
SSE4.1
SSE4
Supports dynamic frequency scaling Yes Yes

gpu

GPU None GPU
Label N/A Intel® HD Graphics 2000
Number of displays supported N/A 2
GPU clock speed N/A 850 MHz
Turbo clock speed N/A 1,100 MHz

memory controller

Memory controller Built-in Built-in

details

Pentium D 830  vs
Core i3 2100 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 2 MB 0.5 MB
L2 cache per core 1 MB/core 0.25 MB/core
Manufacture process 90 nms 32 nms
Max CPUs 1 1
Clock multiplier 15 31
Operating temperature Unknown - 69.8°C Unknown - 69.1°C

overclocking

Overclocked clock speed 3.72 GHz 3.21 GHz
Overclocked clock speed (Water) 4.35 GHz 3.29 GHz
Overclocked clock speed (Air) 3.72 GHz 3.21 GHz

power consumption

TDP 130W 65W
Annual home energy cost 31.32 $/year 37.88 $/year
Annual commercial energy cost 113.88 $/year 93.47 $/year
Performance per watt 1.56 pt/W 4.69 pt/W
Typical power consumption 105.63W 98.28W

bus

Architecture FSB DMI
Number of links 1 1
Intel Pentium D 830
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Intel Core i3 2100
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