CPUBoss Review Our evaluation of E5645 vs 2427 among all CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

5.3

CPUBoss Score

Combination of all six facets

Winner
Intel Xeon E5645 

CPUBoss recommends the Intel Xeon E5645  based on its performance and single-core performance.

See full details

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VS

Differences What are the advantages of each

Front view of Intel Xeon E5645

Reasons to consider the
Intel Xeon E5645

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Much more l3 cache 12 MB vs 6 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
Much better PassMark score 6,545 vs 3,069 Around 2.2x better PassMark score
Significantly higher clock speed 2.4 GHz vs 2.2 GHz Around 10% higher clock speed
Much better performance per watt 8.49 pt/W vs 1.41 pt/W More than 6x better performance per watt
More threads 12 vs 6 Twice as many threads
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 2 MB/core vs 1 MB/core 2x more l3 cache per core
Better overclocked clock speed (Air) 3.39 GHz vs 3.2 GHz More than 5% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 2.4 GHz vs 2.2 GHz Around 10% better overclocked clock speed (Water)
Newer Mar, 2010 vs Jun, 2009 Release date 9 months later
Front view of AMD Opteron 2427

Reasons to consider the
AMD Opteron 2427

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Much more l2 cache 3 MB vs 2 MB 50% more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly more l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core

Benchmarks Real world tests of Xeon E5645 vs Opteron 2427

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5645
20,172
Opteron 2427
8,531

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5645
1,968
Opteron 2427
1,163

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5645
1,340,000 MB/s
Opteron 2427
94.2 MB/s

PassMark Data courtesy Passmark

Xeon E5645
6,545
Opteron 2427
3,069

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E5645  vs
Opteron 2427 
Clock speed 2.4 GHz 2.2 GHz
Cores Hexa core Hexa core
Socket type
LGA 1366
F

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 75W
Annual home energy cost 19.27 $/year 18.07 $/year
Annual commercial energy cost 70.08 $/year 65.7 $/year
Performance per watt 8.49 pt/W 1.41 pt/W
Typical power consumption 65W 60.94W

bus

Architecture QPI HyperTransport 3.0
Clock speed 2,930 MHz 2,200 MHz

details

Xeon E5645  vs
Opteron 2427 
Threads 12 6
L2 cache 2 MB 3 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 12 MB 6 MB
L3 cache per core 2 MB/core 1 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 2
Clock multiplier 18 11
Voltage range 0.75 - 1.35V 1 - UnknownV
Operating temperature Unknown - 76.2°C 0 - 55°C

overclocking

Overclocked clock speed 3.39 GHz 3.2 GHz
Overclocked clock speed (Water) 2.4 GHz 2.2 GHz
Overclocked clock speed (Air) 3.39 GHz 3.2 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
Intel Xeon E5645
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AMD Opteron 2427
Report a correction

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