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Intel Xeon E5645

Front view of Intel Xeon E5645
Front view of Intel Core i7 6700K

Intel Core i7 6700K

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Differences What are the advantages of each

Front view of Intel Xeon E5645

Reasons to consider the
Intel Xeon E5645

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Significantly 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
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
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much better performance per watt 8.49 pt/W vs 3.49 pt/W Around 2.5x better performance per watt
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly better performance per dollar 1.2 pt/$ vs 0.91 pt/$ More than 30% better performance per dollar
More cores 6 vs 4 2 more cores; run more applications at once
More threads 12 vs 8 4 more threads
Lower typical power consumption 65W vs 73.94W More than 10% lower typical power consumption
Higher Maximum operating temperature 76.2 °C vs 64 °C Around 20% higher Maximum operating temperature
Supports more RAM 294,912 MB vs 65,536 MB Supports 4.5x more RAM
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Lower annual home energy cost 19.27 $/year vs 21.92 $/year More than 10% lower annual home energy cost
Lower annual commercial energy cost 70.08 $/year vs 79.72 $/year More than 10% lower annual commercial energy cost
Front view of Intel Core i7 6700K

Reasons to consider the
Intel Core i7 6700K

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Much higher clock speed 4 GHz vs 2.4 GHz More than 65% higher clock speed
Much higher turbo clock speed 4.2 GHz vs 2.67 GHz More than 55% higher turbo clock speed
Much newer manufacturing process 14 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much better PassMark (Single core) score 2,349 vs 1,083 Around 2.2x better PassMark (Single core) score
Significantly better PassMark score 11,109 vs 6,545 Around 70% better PassMark score
Significantly better overclocked clock speed (Air) 4.61 GHz vs 3.39 GHz More than 35% better overclocked clock speed (Air)
Newer Jul, 2015 vs Mar, 2010 Release date over 5 years later
Much better overclocked clock speed (Water) 4.77 GHz vs 2.4 GHz Around 2x better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon E5645 vs Core i7 6700K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5645
20,172
Core i7 6700K
17,583

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5645
1,968
Core i7 6700K
4,510

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5645
1,340,000 MB/s
Core i7 6700K
6,010 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon E5645
11,304
Core i7 6700K
17,169

GeekBench

Xeon E5645
11,929
Core i7 6700K
17,169

PassMark Data courtesy Passmark

Xeon E5645
6,545
Core i7 6700K
11,109

PassMark (Single Core)

Xeon E5645
1,083
Core i7 6700K
2,349

Specifications Full list of technical specs

summary

 Xeon E5645  vs
Core i7 6700K 
Clock speed 2.4 GHz 4 GHz
Turbo clock speed 2.67 GHz 4.2 GHz
Cores Hexa core Quad core

features
Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption
TDP 80W 91W
Annual home energy cost 19.27 $/year 21.92 $/year
Annual commercial energy cost 70.08 $/year 79.72 $/year
Performance per watt 8.49 pt/W 3.49 pt/W
Typical power consumption 65W 73.94W

bus
Architecture QPI FSB
Number of links 2 0
Transfer rate 5,860 MT/s 8,000 MT/s

details

 Xeon E5645  vs
Core i7 6700K 
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 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 32 nm 14 nm
Max CPUs 2 1
Operating temperature Unknown - 76.2°C Unknown - 64°C

overclocking
Overclocked clock speed 3.39 GHz 4.61 GHz
Overclocked clock speed (Water) 2.4 GHz 4.77 GHz
Overclocked clock speed (Air) 3.39 GHz 4.61 GHz

integrated graphics
GPU None GPU
Label N/A Intel® HD Graphics 530
Number of displays supported N/A 3
GPU clock speed N/A 350 MHz
Turbo clock speed N/A 1,150 MHz

memory controller
Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Triple Channel Dual Channel
Supports ECC Yes No
Maximum bandwidth 31,999.98 MB/s 25,600 MB/s
Maximum memory size 294,912 MB 65,536 MB
Intel Xeon E5645
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Intel Core i7 6700K
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