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Differences What are the advantages of each

Front view of Intel Xeon E5-4650

Reasons to consider the
Intel Xeon E5-4650

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Much higher clock speed 2.7 GHz vs 1.2 GHz More than 2.2x higher clock speed
Much more l2 cache 2 MB vs 0.5 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
More cores 8 vs 1 7 more cores; run more applications at once
More threads 16 vs 2 14 more threads
Much better overclocked clock speed (Air) 2.94 GHz vs 1.2 GHz Around 2.5x better overclocked clock speed (Air)
Supports more RAM 393,216 MB vs 3,000.32 MB Supports more than 131x more RAM
Much better overclocked clock speed (Water) 2.7 GHz vs 1.2 GHz More than 2.2x better overclocked clock speed (Water)
Newer May, 2012 vs Apr, 2011 Release date over 1 years later
Front view of Intel Atom Z650

Reasons to consider the
Intel Atom Z650

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Much lower typical power consumption 2.44W vs 105.63W 43.3x lower typical power consumption
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower annual home energy cost 0.72 $/year vs 31.32 $/year 43.3x lower annual home energy cost
Much lower annual commercial energy cost 2.63 $/year vs 113.88 $/year 43.3x lower annual commercial energy cost
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Features Key features of the Xeon E5-4650  vs Atom Z650 

clock speed

Xeon E5-4650
2.7 GHz
Atom Z650
1.2 GHz

L2 cache

Atom Z650
0.5 MB

overclocked clock speed (air)

Xeon E5-4650
2.94 GHz
Atom Z650
1.2 GHz

overclocked clock speed (water)

Xeon E5-4650
2.7 GHz
Atom Z650
1.2 GHz

TDP

Specifications Full list of technical specs

summary

Xeon E5-4650  vs
Atom Z650 
Clock speed 2.7 GHz 1.2 GHz
Cores Octa core Single core

features

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

power consumption

TDP 130W 3W
Annual home energy cost 31.32 $/year 0.72 $/year
Annual commercial energy cost 113.88 $/year 2.63 $/year
Typical power consumption 105.63W 2.44W

bus

Architecture QPI FSB
Number of links 2 1

details

Xeon E5-4650  vs
Atom Z650 
Architecture x86-64 x86
Threads 16 2
L2 cache 2 MB 0.5 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 4 1
Voltage range 0.6 - 1.35V 1.11 - 1.5V

overclocking

Overclocked clock speed 2.94 GHz 1.2 GHz
Overclocked clock speed (Water) 2.7 GHz 1.2 GHz
Overclocked clock speed (Air) 2.94 GHz 1.2 GHz

integrated graphics

GPU None GPU
Label N/A Integrated
GPU clock speed N/A 400 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
DDR2-800
DDR2
Channels Quad Channel Single Channel
Supports ECC Yes No
Maximum bandwidth 51,200 MB/s 6,400 MB/s
Maximum memory size 393,216 MB 3,000.32 MB
Intel Xeon E5-4650
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Intel Atom Z650
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