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Differences What are the advantages of each

Front view of Intel Pentium 1405

Reasons to consider the
Intel Pentium 1405

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Supports more RAM 384,000 MB vs 32,768 MB Supports around 11.8x more RAM
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
Slightly lower typical power consumption 32.5W vs 36.56W More than 10% lower typical power consumption
Newer Apr, 2012 vs Jan, 2011 Release date over 1 years later
Slightly lower annual home energy cost 9.64 $/year vs 10.84 $/year More than 10% lower annual home energy cost
Slightly lower annual commercial energy cost 35.04 $/year vs 39.42 $/year More than 10% lower annual commercial energy cost
Front view of Intel Core i7 2820QM

Reasons to consider the
Intel Core i7 2820QM

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Much higher turbo clock speed 3.4 GHz vs 1.8 GHz Around 90% higher turbo clock speed
Significantly higher clock speed 2.3 GHz vs 1.2 GHz More than 90% higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
More l3 cache 8 MB vs 5 MB 60% more l3 cache; more data can be stored in the l3 cache for quick access later
Significantly better overclocked clock speed (Air) 3.04 GHz vs 1.8 GHz Around 70% better overclocked clock speed (Air)
More threads 8 vs 2 6 more threads
More cores 4 vs 2 Twice as many cores; run more applications at once
Better overclocked clock speed (Water) 2.3 GHz vs 1.8 GHz Around 30% better overclocked clock speed (Water)

Features Key features of the Pentium 1405  vs Core i7 2820QM 

clock speed

Pentium 1405
1.2 GHz
Core i7 2820QM
2.3 GHz

turbo clock speed

Pentium 1405
1.8 GHz
Core i7 2820QM
3.4 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Pentium 1405
1.8 GHz
Core i7 2820QM
3.04 GHz

overclocked clock speed (water)

Pentium 1405
1.8 GHz
Core i7 2820QM
2.3 GHz

Specifications Full list of technical specs

summary

Pentium 1405  vs
Core i7 2820QM 
Clock speed 1.2 GHz 2.3 GHz
Turbo clock speed 1.8 GHz 3.4 GHz
Cores Dual core Quad core

features

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

power consumption

TDP 40W 45W
Annual home energy cost 9.64 $/year 10.84 $/year
Annual commercial energy cost 35.04 $/year 39.42 $/year
Typical power consumption 32.5W 36.56W

bus

Architecture QPI DMI
Number of links 1 1
Transfer rate 0 MT/s 5,000 MT/s

details

Pentium 1405  vs
Core i7 2820QM 
Architecture x86-64 x86-64
Threads 2 8
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 0.25 MB/core
L3 cache 5 MB 8 MB
L3 cache per core 2.5 MB/core 2 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 1.8 GHz 3.04 GHz
Overclocked clock speed (Water) 1.8 GHz 2.3 GHz
Overclocked clock speed (Air) 1.8 GHz 3.04 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

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Dual Channel Dual Channel
Supports ECC Yes No
Maximum bandwidth 17,066.66 MB/s 25,600 MB/s
Maximum memory size 384,000 MB 32,768 MB
Intel Pentium 1405
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Intel Core i7 2820QM
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