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Differences What are the advantages of each

Front view of Intel Xeon X5677

Reasons to consider the
Intel Xeon X5677

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Much higher clock speed 3.46 GHz vs 2.13 GHz More than 60% higher clock speed
Much higher turbo clock speed 3.73 GHz vs 2.4 GHz More than 55% higher turbo clock speed
Much more l3 cache 12 MB vs 8 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
Much better overclocked clock speed (Air) 4.78 GHz vs 3.71 GHz Around 30% better overclocked clock speed (Air)
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Supports more RAM 294,912 MB vs 147,456 MB Supports 2x more RAM
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l3 cache per core 3 MB/core vs 2 MB/core 50% more l3 cache per core
Much better overclocked clock speed (Water) 3.47 GHz vs 2.13 GHz More than 60% better overclocked clock speed (Water)
Newer Mar, 2010 vs Mar, 2009 Release date 11 months later
Front view of Intel Xeon L5518

Reasons to consider the
Intel Xeon L5518

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Much lower typical power consumption 48.75W vs 105.63W 2.2x lower typical power consumption
Much lower annual commercial energy cost 52.56 $/year vs 113.88 $/year 2.2x lower annual commercial energy cost
Much lower annual home energy cost 14.45 $/year vs 31.32 $/year 2.2x lower annual home energy cost

Features Key features of the Xeon X5677  vs L5518 

clock speed

Xeon X5677
3.46 GHz
Xeon L5518
2.13 GHz

turbo clock speed

Xeon X5677
3.73 GHz
Xeon L5518
2.4 GHz

L2 cache

L3 cache

Xeon X5677
12 MB
Xeon L5518
8 MB

overclocked clock speed (air)

Xeon X5677
4.78 GHz
Xeon L5518
3.71 GHz

overclocked clock speed (water)

Xeon X5677
3.47 GHz
Xeon L5518
2.13 GHz

Specifications Full list of technical specs

summary

Xeon X5677  vs
L5518 
Clock speed 3.46 GHz 2.13 GHz
Turbo clock speed 3.73 GHz 2.4 GHz
Cores Quad core Quad core
Socket type
LGA 1366

features

Has a NX bit Yes Yes
Supports trusted computing Yes 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 130W 60W
Annual home energy cost 31.32 $/year 14.45 $/year
Annual commercial energy cost 113.88 $/year 52.56 $/year
Typical power consumption 105.63W 48.75W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Triple Channel
Supports ECC Yes Yes
Maximum bandwidth 31,999.98 MB/s 25,599.99 MB/s
Maximum memory size 294,912 MB 147,456 MB

details

Xeon X5677  vs
L5518 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 12 MB 8 MB
L3 cache per core 3 MB/core 2 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 2
Voltage range 0.75 - 1.35V 0.75 - 1.35V
Operating temperature Unknown - 80.4°C Unknown - 85°C

overclocking

Overclocked clock speed 4.78 GHz 3.71 GHz
Overclocked clock speed (Water) 3.47 GHz 2.13 GHz
Overclocked clock speed (Air) 4.78 GHz 3.71 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A

bus

Architecture QPI QPI
Number of links 2 2
Data rate 51,200 MB/s 46,880 MB/s
Transfer rate 6,400 MT/s 5,860 MT/s
Clock speed 3,200 MHz 2,930 MHz
Intel Xeon X5677
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Intel Xeon L5518
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