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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 more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly higher clock speed 2.8 GHz vs 2.3 GHz More than 20% higher clock speed
Much better overclocked clock speed (Air) 3.52 GHz vs 2.75 GHz Around 30% 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 overclocked clock speed (Water) 4.25 GHz vs 3.13 GHz More than 35% better overclocked clock speed (Water)
Front view of AMD Athlon 64 X2 4400+

Reasons to consider the
AMD Athlon 64 X2 4400+

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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
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
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

Benchmarks Real world tests of Pentium D 820 vs Athlon 64 X2 4400+

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
Athlon 64 X2 4400+
85.5 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
Athlon 64 X2 4400+ 
Clock speed 2.8 GHz 2.3 GHz
Cores Dual core Dual core
Socket type
LGA 775
AM2
939

features

Has a NX bit Yes Yes
Has virtualization support No Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
3DNow!
Supports dynamic frequency scaling No Yes

details

Pentium D 820  vs
Athlon 64 X2 4400+ 
Threads 2 2
L2 cache 2 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 90 nm 90 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.52 GHz 2.75 GHz
Overclocked clock speed (Water) 4.25 GHz 3.13 GHz
PassMark (Overclocked) 908.7 1,605.4
Overclocked clock speed (Air) 3.52 GHz 2.75 GHz

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 0.89 pt/W
Typical power consumption 77.19W 52.81W
Intel Pentium D 820
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AMD Athlon 64 X2 4400+
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