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Differences What are the advantages of each

Front view of Intel Core i7 990X

Reasons to consider the
Intel Core i7 990X

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of Intel Core i7 870

Reasons to consider the
Intel Core i7 870

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Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing

Benchmarks Real world tests of Core i7 990X vs 870

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 990X
14,805
Core i7 870
8,046

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 990X
1,750,000 MB/s
Core i7 870
142,100 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 990X
14,910
Core i7 870
7,874

GeekBench (64-bit) Data courtesy Primate Labs

Core i7 990X
15,371
Core i7 870
8,534

GeekBench

Core i7 990X
17,123
Core i7 870
10,143

PassMark Data courtesy Passmark

PassMark (Single Core)

Reviews Word on the street

Specifications Full list of technical specs

summary

Core i7 990X  vs
870 
Clock speed 3.46 GHz 2.93 GHz
Turbo clock speed 3.73 GHz 3.6 GHz
Cores Hexa core Quad core
Socket type
LGA 1366
LGA 1156
Is unlocked Yes No

features

Has a NX bit Yes Yes
Supports trusted computing No 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 130W 95W
Annual home energy cost 31.32 $/year 42.57 $/year
Annual commercial energy cost 113.88 $/year 120.89 $/year
Performance per watt 6.36 pt/W 1.11 pt/W
Typical power consumption 105.63W 121W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Triple Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,599.99 MB/s 21,333.32 MB/s
Maximum memory size 24,576 MB 16,384 MB

details

Core i7 990X  vs
870 
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 45 nm
Max CPUs 1 1
Clock multiplier 26 22
Voltage range 0.8 - 1.38V 0.65 - 1.4V
Operating temperature Unknown - 67.9°C Unknown - 72.7°C

overclocking

Overclock popularity 54 37
Overclocked clock speed 4.58 GHz 4.1 GHz
Overclocked clock speed (Water) 4.47 GHz 4.28 GHz
Overclocked clock speed (Air) 4.58 GHz 4.1 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 DMI
Number of links 1 1
Transfer rate 6,400 MT/s 2,500 MT/s
Intel Core i7 990X
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Intel Core i7 870
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