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Differences What are the advantages of each

Front view of Intel Pentium 4405U

Reasons to consider the
Intel Pentium 4405U

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Higher clock speed 2.1 GHz vs 1.6 GHz More than 30% higher clock speed
Better geekbench 3 Multi-Core score 4,463 vs 2,869 More than 55% better geekbench 3 Multi-Core score
Better turbo clock speed 950 MHz vs 900 MHz More than 5% better turbo clock speed
Better geekbench 3 single core score 2,119 vs 1,758 More than 20% better geekbench 3 single core score
Better performance per watt 7.25 pt/W vs 5.17 pt/W More than 40% better performance per watt
Better overclocked clock speed (Air) 2.1 GHz vs 1.6 GHz More than 30% better overclocked clock speed (Air)
More threads 4 vs 2 Twice as many threads
Better overclocked clock speed (Water) 2.1 GHz vs 1.6 GHz More than 30% better overclocked clock speed (Water)
Front view of Intel 3855U

Reasons to consider the
Intel 3855U

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Newer Oct, 2015 vs Jul, 2015 Release date 3 months later

Benchmarks Real world tests of Pentium 4405U vs 3855U

GeekBench 3 (Multi-core) Data courtesy Primate Labs

3855U
2,869

GeekBench 3 (Single core) Data courtesy Primate Labs

3855U
1,758

GeekBench 3 (AES single core) Data courtesy Primate Labs

Pentium 4405U
2,920 MB/s
3855U
2,220 MB/s

PassMark Data courtesy Passmark

3855U
1,715

PassMark (Single Core)

3855U
906

Specifications Full list of technical specs

summary

Pentium 4405U  vs
3855U 
Clock speed 2.1 GHz 1.6 GHz
Cores Dual core Dual core

features

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

power consumption

TDP 15W 15W
Annual home energy cost 3.61 $/year 3.61 $/year
Annual commercial energy cost 13.14 $/year 13.14 $/year
Performance per watt 7.25 pt/W 5.17 pt/W
Typical power consumption 12.19W 12.19W

bus

Architecture FSB FSB
Number of links 1 1
Transfer rate 4,000 MT/s 4,000 MT/s

details

Pentium 4405U  vs
3855U 
Architecture x86-64 x86-64
Threads 4 2
L3 cache 2 MB 2 MB
L3 cache per core 1 MB/core 1 MB/core
Manufacture process 14 nm 14 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.1 GHz 1.6 GHz
Overclocked clock speed (Water) 2.1 GHz 1.6 GHz
Overclocked clock speed (Air) 2.1 GHz 1.6 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 510 Intel® HD Graphics 510
Number of displays supported 3 3
GPU clock speed 300 MHz 300 MHz
Turbo clock speed 950 MHz 900 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
LPDDR3-1600
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 29,866.66 MB/s 29,866.66 MB/s
Maximum memory size 32,768 MB 32,768 MB
Intel Pentium 4405U
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Intel 3855U
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