CPUBoss Review Our evaluation of E5-2640 vs 6238 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

5.4

CPUBoss Score

Combination of all six facets

Winner
Intel Xeon E5-2640 

CPUBoss recommends the Intel Xeon E5-2640  based on its single-core performance and cost to run.

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VS

Differences What are the advantages of each

Front view of Intel Xeon E5-2640

Reasons to consider the
Intel Xeon E5-2640

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Much better PassMark (Single core) score 1,854 vs 891 More than 2x better PassMark (Single core) score
Much better performance per watt 7.66 pt/W vs 1.11 pt/W Around 7x better performance per watt
Much more l3 cache per core 2.5 MB/core vs 1.33 MB/core Around 90% more l3 cache per core
Lower typical power consumption 77.19W vs 93.44W More than 15% lower typical power consumption
Lower annual commercial energy cost 83.22 $/year vs 100.74 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 22.89 $/year vs 27.7 $/year More than 15% lower annual home energy cost
Front view of AMD Opteron 6238

Reasons to consider the
AMD Opteron 6238

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Much more l2 cache 12 MB vs 2 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Higher clock speed 2.6 GHz vs 2.5 GHz Around 5% higher clock speed
Higher turbo clock speed 3.2 GHz vs 3 GHz More than 5% higher turbo clock speed
Much better overclocked clock speed (Air) 3.88 GHz vs 2.9 GHz Around 35% better overclocked clock speed (Air)
Much more l2 cache per core 1 MB/core vs 0.33 MB/core More than 3x more l2 cache per core
More l3 cache 16 MB vs 15 MB More than 5% more l3 cache; more data can be stored in the l3 cache for quick access later
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Much better overclocked clock speed (Water) 2.9 GHz vs 2.5 GHz More than 15% better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon E5-2640 vs Opteron 6238

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5-2640
1,400,000 MB/s
Opteron 6238
1,470 MB/s

PassMark Data courtesy Passmark

Xeon E5-2640
15,348
Opteron 6238
7,316

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E5-2640  vs
Opteron 6238 
Clock speed 2.5 GHz 2.6 GHz
Turbo clock speed 3 GHz 3.2 GHz
Cores Hexa core Duodeca core
Socket type
LGA 2011
G34

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES

power consumption

TDP 95W 115W
Annual home energy cost 22.89 $/year 27.7 $/year
Annual commercial energy cost 83.22 $/year 100.74 $/year
Performance per watt 7.66 pt/W 1.11 pt/W
Typical power consumption 77.19W 93.44W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3

details

Xeon E5-2640  vs
Opteron 6238 
Threads 12 12
L2 cache 2 MB 12 MB
L2 cache per core 0.33 MB/core 1 MB/core
L3 cache 15 MB 16 MB
L3 cache per core 2.5 MB/core 1.33 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 4
Clock multiplier 30 16
Operating temperature Unknown - 73°C Unknown - 70.4°C

overclocking

Overclock popularity 3 0
Overclocked clock speed 2.9 GHz 3.88 GHz
Overclocked clock speed (Water) 2.5 GHz 2.9 GHz
Overclocked clock speed (Air) 2.9 GHz 3.88 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 HyperTransport 3.0
Number of links 2 4
Transfer rate 7,200 MT/s 6,400 MT/s
Clock speed 3,600 MHz 3,200 MHz
Intel Xeon E5-2640
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AMD Opteron 6238
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