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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
More cores 6 vs 4 2 more cores; run more applications at once
More threads 12 vs 8 4 more threads
Supports more RAM 294,912 MB vs 32,768 MB Supports 9x more RAM
Higher Maximum operating temperature 76.2 °C vs 67.4 °C Around 15% higher Maximum operating temperature
Better performance per watt 8.49 pt/W vs 7.25 pt/W More than 15% better performance per watt
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 Core i7 3770

Reasons to consider the
Intel Core i7 3770

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Significantly higher turbo clock speed 3.9 GHz vs 2.67 GHz More than 45% higher turbo clock speed
Significantly higher clock speed 3.4 GHz vs 2.4 GHz More than 40% higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Significantly newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per dollar 2.33 pt/$ vs 1.2 pt/$ Around 95% better performance per dollar
Significantly better PassMark (Single core) score 2,072 vs 1,083 More than 90% better PassMark (Single core) score
Better PassMark score 9,449 vs 6,545 Around 45% better PassMark score
Better overclocked clock speed (Air) 4.03 GHz vs 3.39 GHz Around 20% better overclocked clock speed (Air)
Newer Apr, 2012 vs Mar, 2010 Release date over 2 years later
Much better overclocked clock speed (Water) 4.32 GHz vs 2.4 GHz Around 80% better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon E5645 vs Core i7 3770

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5645
20,172
Core i7 3770
12,524

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5645
1,968
Core i7 3770
3,236

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5645
1,340,000 MB/s
Core i7 3770
2,660,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon E5645
11,304
Core i7 3770
12,495

GeekBench (64-bit) Data courtesy Primate Labs

Xeon E5645
11,929
Core i7 3770
13,300

GeekBench

Xeon E5645
11,929
Core i7 3770
16,134

PassMark Data courtesy Passmark

Xeon E5645
6,545
Core i7 3770
9,449

PassMark (Single Core)

Xeon E5645
1,083
Core i7 3770
2,072

Specifications Full list of technical specs

summary

Xeon E5645  vs
Core i7 3770 
Clock speed 2.4 GHz 3.4 GHz
Turbo clock speed 2.67 GHz 3.9 GHz
Cores Hexa core Quad core
Socket type
LGA 1366
LGA 1155

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 77W
Annual home energy cost 19.27 $/year 18.55 $/year
Annual commercial energy cost 70.08 $/year 67.45 $/year
Performance per watt 8.49 pt/W 7.25 pt/W
Typical power consumption 65W 62.56W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
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 32,768 MB

details

Xeon E5645  vs
Core i7 3770 
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 22 nm
Max CPUs 2 1
Clock multiplier 18 34
Operating temperature Unknown - 76.2°C Unknown - 67.4°C

overclocking

Overclock popularity 3 8
Overclocked clock speed 3.39 GHz 4.03 GHz
Overclocked clock speed (Water) 2.4 GHz 4.32 GHz
Overclocked clock speed (Air) 3.39 GHz 4.03 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 4000
Latest DirectX N/A 11.x
Number of displays supported N/A 3
GPU clock speed N/A 650 MHz
Turbo clock speed N/A 1,150 MHz
3DMark06 N/A 5,339.9

bus

Architecture QPI DMI
Number of links 2 1
Transfer rate 5,860 MT/s 5,000 MT/s
Intel Xeon E5645
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Intel Core i7 3770
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