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Differences What are the advantages of each

Front view of Intel Xeon X5650

Reasons to consider the
Intel Xeon X5650

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Much higher clock speed 2.66 GHz vs 1.87 GHz More than 40% higher clock speed
Significantly higher turbo clock speed 3.06 GHz vs 2.53 GHz More than 20% higher turbo clock speed
Much better overclocked clock speed (Air) 3.84 GHz vs 1.87 GHz More than 2x better overclocked clock speed (Air)
Much better performance per watt 7.89 pt/W vs 2.79 pt/W More than 2.8x better performance per watt
Much better performance per dollar 1.44 pt/$ vs 0.08 pt/$ More than 17.8x better performance per dollar
Much higher Maximum operating temperature 81.3 °C vs 70 °C More than 15% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.64 GHz vs 1.87 GHz Around 2.5x better overclocked clock speed (Water)
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Front view of Intel Xeon L7555

Reasons to consider the
Intel Xeon L7555

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Much more l3 cache 24 MB vs 12 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 16 vs 12 4 more threads
Supports more CPUs in SMP configuration 8 vs 2 6 supports more CPUs in SMP configuration
Much more l3 cache per core 3 MB/core vs 2 MB/core 50% more l3 cache per core

Benchmarks Real world tests of Xeon X5650 vs L7555

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon X5650
22,313
Xeon L7555
16,824

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon X5650
2,176
Xeon L7555
1,386

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon X5650
1,470,000 MB/s
Xeon L7555
114,400 MB/s

Specifications Full list of technical specs

summary

Xeon X5650  vs
L7555 
Clock speed 2.66 GHz 1.87 GHz
Turbo clock speed 3.06 GHz 2.53 GHz
Cores Hexa core Octa core
Socket type
LGA 1366
LGA 1567

features

Has a NX bit Yes Yes
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 95W 95W
Annual home energy cost 22.89 $/year 22.89 $/year
Annual commercial energy cost 83.22 $/year 83.22 $/year
Performance per watt 7.89 pt/W 2.79 pt/W
Typical power consumption 77.19W 77.19W

details

Xeon X5650  vs
L7555 
Threads 12 16
L2 cache 2 MB 2 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
L3 cache 12 MB 24 MB
L3 cache per core 2 MB/core 3 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 8
Voltage range 0.75 - 1.35V 0.68 - 1.35V
Operating temperature Unknown - 81.3°C Unknown - 70°C

overclocking

Overclocked clock speed 3.84 GHz 1.87 GHz
Overclocked clock speed (Water) 4.64 GHz 1.87 GHz
Overclocked clock speed (Air) 3.84 GHz 1.87 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 4
Data rate 51,200 MB/s 93,856 MB/s
Transfer rate 6,400 MT/s 5,860 MT/s
Clock speed 3,200 MHz 2,930 MHz
Intel Xeon X5650
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Intel Xeon L7555
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