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Front view of Intel Core i5 2540M

Intel Core i5 2540M

CPUBoss Winner

Differences What are the advantages of each

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 more l2 cache per core 3 MB/core vs 0.5 MB/core 6x more l2 cache per core
Higher clock speed 3 GHz vs 2.6 GHz More than 15% higher clock speed
Significantly better overclocked clock speed (Air) 4.22 GHz vs 3.08 GHz More than 35% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.23 GHz vs 2.6 GHz Around 65% better overclocked clock speed (Water)
Front view of Intel Core i5 2540M

Reasons to consider the
Intel Core i5 2540M

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Much better performance per dollar 7.19 pt/$ vs 0.67 pt/$ More than 10.8x better performance per dollar
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 better performance per watt 20.13 pt/W vs 1.83 pt/W Around 11x better performance per watt
Significantly lower typical power consumption 28.44W vs 52.81W More than 45% lower typical power consumption
Much higher Maximum operating temperature 100 °C vs 72.4 °C Around 40% higher Maximum operating temperature
Significantly better geekbench 3 Multi-Core score 5,066 vs 2,982 Around 70% better geekbench 3 Multi-Core score
Better PassMark (Single core) score 1,560 vs 1,251 Around 25% better PassMark (Single core) score
Newer Feb, 2011 vs Jan, 2008 Release date over 3 years later
More threads 4 vs 2 Twice as many threads
Significantly lower annual home energy cost 8.43 $/year vs 15.66 $/year More than 45% lower annual home energy cost
Significantly lower annual commercial energy cost 30.66 $/year vs 56.94 $/year More than 45% lower annual commercial energy cost

Benchmarks Real world tests of Core2 Duo E8400 vs Core i5 2540M

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

Core2 Duo E8400
128,000 MB/s
Core i5 2540M
2,030,000 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

Core2 Duo E8400  vs
Core i5 2540M 
Clock speed 3 GHz 2.6 GHz
Cores Dual core Dual core
Socket type
LGA 775
BGA 1023
rPGA 988B

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 35W
Annual home energy cost 15.66 $/year 8.43 $/year
Annual commercial energy cost 56.94 $/year 30.66 $/year
Performance per watt 1.83 pt/W 20.13 pt/W
Typical power consumption 52.81W 28.44W

details

Core2 Duo E8400  vs
Core i5 2540M 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 6 MB 1 MB
L2 cache per core 3 MB/core 0.5 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1
Clock multiplier 9 26
Operating temperature Unknown - 72.4°C Unknown - 100°C

overclocking

Overclocked clock speed 4.22 GHz 3.08 GHz
Overclocked clock speed (Water) 4.23 GHz 2.6 GHz
Overclocked clock speed (Air) 4.22 GHz 3.08 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 3000
Number of displays supported N/A 2
GPU clock speed N/A 650 MHz
Turbo clock speed N/A 1,300 MHz

bus

Architecture FSB DMI
Number of links 1 1
Intel Core2 Duo E8400
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Intel Core i5 2540M
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