CPUBoss Review Our evaluation of 945 vs 820 among desktop CPUs (over 75W)

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

No winner declared

Too close to call

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VS

Differences What are the advantages of each

Front view of Intel Pentium D 945

Reasons to consider the
Intel Pentium D 945

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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
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 820 vs the 945.

Benchmarks Real world tests of Pentium D 945 vs 820

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 945
122,800 MB/s
Pentium D 820
100,200 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 945  vs
820 
Clock speed 3.4 GHz 2.8 GHz
Cores Dual core Dual 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 Yes No

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

bus

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

details

Pentium D 945  vs
820 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 4 MB 2 MB
L2 cache per core 2 MB/core 1 MB/core
Manufacture process 65 nm 90 nm
Transistor count 376,000,000 230,000,000
Max CPUs 1 1
Clock multiplier 17 14
Voltage range 1.2 - 1.34V 1.2 - 1.4V
Operating temperature Unknown - 63.4°C Unknown - 64.1°C

overclocking

Overclock popularity 9 11
Overclocked clock speed 4.22 GHz 3.52 GHz
Overclocked clock speed (Water) 4.59 GHz 4.25 GHz
PassMark (Overclocked) 1,049.4 908.7
Overclocked clock speed (Air) 4.22 GHz 3.52 GHz

power consumption

TDP 95W 95W
Annual home energy cost 22.89 $/year 22.89 $/year
Annual commercial energy cost 83.22 $/year 83.22 $/year
Performance per watt 1.14 pt/W 0.94 pt/W
Typical power consumption 77.19W 77.19W

memory controller

Memory controller Built-in Built-in
Supports ECC No No
Intel Pentium D 945
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Intel Pentium D 820
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