CPUBoss Review Our evaluation of E5645 vs E5640 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

No winner declared

Too close to call

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VS

Intel Xeon E5645

CPUBoss Winner
Front view of Intel Xeon E5645

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 l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much better PassMark score 6,545 vs 5,311 Around 25% better PassMark score
More cores 6 vs 4 2 more cores; run more applications at once
Much better performance per dollar 1.2 pt/$ vs 0.75 pt/$ Around 60% better performance per dollar
More threads 12 vs 8 4 more threads
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 E5640

Reasons to consider the
Intel Xeon E5640

Report a correction
Significantly higher clock speed 2.66 GHz vs 2.4 GHz More than 10% higher clock speed
Higher turbo clock speed 2.93 GHz vs 2.67 GHz Around 10% higher turbo clock speed
Much better overclocked clock speed (Air) 4.24 GHz vs 3.39 GHz More than 25% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.41 GHz vs 2.4 GHz Around 85% better overclocked clock speed (Water)
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 E5645 vs E5640

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5645
20,172
Xeon E5640
8,170

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5645
1,968
Xeon E5640
2,008

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5645
1,340,000 MB/s
Xeon E5640
1,300,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon E5645
11,304
Xeon E5640
8,314

GeekBench

Xeon E5645
11,929
Xeon E5640
8,314

PassMark Data courtesy Passmark

Xeon E5645
6,545
Xeon E5640
5,311

PassMark (Single Core)

Xeon E5645
1,083
Xeon E5640
1,134

Specifications Full list of technical specs

summary

Xeon E5645  vs
E5640 
Clock speed 2.4 GHz 2.66 GHz
Turbo clock speed 2.67 GHz 2.93 GHz
Cores Hexa core Quad core
Socket type
LGA 1366

features

Has a NX bit Yes Yes
Supports trusted computing 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 80W 80W
Annual home energy cost 19.27 $/year 19.27 $/year
Annual commercial energy cost 70.08 $/year 70.08 $/year
Performance per watt 8.49 pt/W 7.32 pt/W
Typical power consumption 65W 65W

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 294,912 MB

details

Xeon E5645  vs
E5640 
Architecture x86-64 x86-64
Threads 12 8
L2 cache 2 MB 1 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
L3 cache 12 MB 12 MB
L3 cache per core 2 MB/core 3 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2
Clock multiplier 18 20
Voltage range 0.75 - 1.35V 0.75 - 1.35V
Operating temperature Unknown - 76.2°C Unknown - 77.6°C

overclocking

Overclock popularity 3 3
Overclocked clock speed 3.39 GHz 4.24 GHz
Overclocked clock speed (Water) 2.4 GHz 4.41 GHz
Overclocked clock speed (Air) 3.39 GHz 4.24 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 46,928 MB/s 46,928 MB/s
Transfer rate 5,860 MT/s 5,860 MT/s
Clock speed 2,930 MHz 2,930 MHz
Intel Xeon E5645
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Intel Xeon E5640
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