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Differences What are the advantages of each

Front view of Intel Pentium 987

Reasons to consider the
Intel Pentium 987

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 13.81W vs 52.81W 3.8x lower typical power consumption
Much better performance per dollar 0.57 pt/$ vs 0.01 pt/$ Around 48.2x better performance per dollar
Much higher Maximum operating temperature 100 °C vs 72.4 °C Around 40% higher Maximum operating temperature
Newer Jul, 2012 vs Jan, 2008 Release date over 4 years later
Better performance per watt 4.49 pt/W vs 1.83 pt/W Around 2.5x better performance per watt
Much lower annual home energy cost 4.1 $/year vs 15.66 $/year 3.8x lower annual home energy cost
Much lower annual commercial energy cost 14.89 $/year vs 56.94 $/year 3.8x lower annual commercial energy cost
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much more l2 cache 6 MB vs 1 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 3 GHz vs 1.5 GHz 2x higher clock speed
Much better geekbench 2 (32-bit) score 2,826 vs 1,715 Around 65% better geekbench 2 (32-bit) score
Much more l2 cache per core 3 MB/core vs 0.5 MB/core 6x more l2 cache per core
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much better overclocked clock speed (Air) 4.22 GHz vs 1.5 GHz More than 2.8x better overclocked clock speed (Air)
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Better PassMark (Single core) score 1,251 vs 699 Around 80% better PassMark (Single core) score
Much better overclocked clock speed (Water) 4.23 GHz vs 1.5 GHz More than 2.8x better overclocked clock speed (Water)
Slightly better PassMark score 2,160 vs 1,223 More than 75% better PassMark score

Benchmarks Real world tests of Pentium 987 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 987
73,700 MB/s
Core2 Duo E8400
128,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Pentium 987  vs
Core2 Duo E8400 
Clock speed 1.5 GHz 3 GHz
Cores Dual core Dual core
Socket type
BGA 1023
LGA 775

features

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

power consumption

TDP 17W 65W
Annual home energy cost 4.1 $/year 15.66 $/year
Annual commercial energy cost 14.89 $/year 56.94 $/year
Performance per watt 4.49 pt/W 1.83 pt/W
Typical power consumption 13.81W 52.81W

details

Pentium 987  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 1 MB 6 MB
L2 cache per core 0.5 MB/core 3 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 1
Clock multiplier 15 9
Operating temperature Unknown - 100°C Unknown - 72.4°C

overclocking

Overclocked clock speed 1.5 GHz 4.22 GHz
Overclocked clock speed (Water) 1.5 GHz 4.23 GHz
Overclocked clock speed (Air) 1.5 GHz 4.22 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics N/A
Number of displays supported 2 N/A
GPU clock speed 350 MHz N/A
Turbo clock speed 1,000 MHz N/A

bus

Architecture DMI FSB
Number of links 1 1
Intel Pentium 987
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Intel Core2 Duo E8400
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