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Differences What are the advantages of each

Front view of Intel Xeon X3470

Reasons to consider the
Intel Xeon X3470

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More l3 cache 8 MB vs 4 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
Significantly lower typical power consumption 77.19W vs 99.55W More than 20% lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 8 vs 4 Twice as many threads
Better PassMark score 5,195 vs 3,184 Around 65% better PassMark score
Much lower annual home energy cost 22.89 $/year vs 36.95 $/year Around 40% lower annual home energy cost
Significantly better overclocked clock speed (Water) 4.39 GHz vs 3.33 GHz More than 30% better overclocked clock speed (Water)
Lower annual commercial energy cost 83.22 $/year vs 96.71 $/year Around 15% lower annual commercial energy cost
Front view of Intel Core i5 661

Reasons to consider the
Intel Core i5 661

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Much better performance per dollar 3.72 pt/$ vs 0.4 pt/$ More than 9.2x 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
Higher clock speed 3.33 GHz vs 2.93 GHz Around 15% higher clock speed
Significantly better performance per watt 5.96 pt/W vs 1.43 pt/W Around 4.2x better performance per watt
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Better overclocked clock speed (Air) 4.66 GHz vs 3.96 GHz Around 20% better overclocked clock speed (Air)
Newer Jan, 2010 vs Sep, 2009 Release date 3 months later

Benchmarks Real world tests of Xeon X3470 vs Core i5 661

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon X3470
Core i5 661

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon X3470
Core i5 661

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon X3470
108 MB/s
Core i5 661
1,600,000 MB/s

PassMark Data courtesy Passmark

Xeon X3470
Core i5 661

PassMark (Single Core)

Xeon X3470
Core i5 661

Specifications Full list of technical specs


Xeon X3470  vs
Core i5 661 
Clock speed 2.93 GHz 3.33 GHz
Turbo clock speed 3.6 GHz 3.6 GHz
Cores Quad core Dual core
Socket type
LGA 1156


Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 87W
Annual home energy cost 22.89 $/year 36.95 $/year
Annual commercial energy cost 83.22 $/year 96.71 $/year
Performance per watt 1.43 pt/W 5.96 pt/W
Typical power consumption 77.19W 99.55W


Architecture DMI DMI
Number of links 1 1
Transfer rate 2,500 MT/s 2,500 MT/s


Xeon X3470  vs
Core i5 661 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB 4 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Transistor count 774,000,000 382,000,000
Max CPUs 1 1
Clock multiplier 22 25
Voltage range 0.65 - 1.4V 0.65 - 1.4V
Operating temperature Unknown - 72.7°C Unknown - 69.8°C


Overclocked clock speed 3.96 GHz 4.66 GHz
Overclocked clock speed (Water) 4.39 GHz 3.33 GHz
Overclocked clock speed (Air) 3.96 GHz 4.66 GHz

integrated graphics

Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 900 MHz

memory controller

Memory controller Built-in Built-in
Memory type
Channels Dual Channel Dual Channel
Maximum bandwidth 21,333.32 MB/s 21,333.32 MB/s
Maximum memory size 32,768 MB 16,773.12 MB
Intel Xeon X3470
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Intel Core i5 661
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