CPUBoss Review Our evaluation of 990X vs 6700K 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

8.2

CPUBoss Score

Combination of all six facets

Winner
Intel Core i7 6700K 

CPUBoss recommends the Intel Core i7 6700K  based on its performance, single-core performance and value.

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VS
Front view of Intel Core i7 6700K

Intel Core i7 6700K

CPUBoss Winner

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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Much better 3DMark06 CPU score 7,042 vs 80.5 Around 87.5x better 3DMark06 CPU score
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
More cores 6 vs 4 2 more cores; run more applications at once
Significantly better performance per watt 6.36 pt/W vs 3.49 pt/W More than 80% better performance per watt
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
Higher Maximum operating temperature 67.9 °C vs 64 °C More than 5% higher Maximum operating temperature
Front view of Intel Core i7 6700K

Reasons to consider the
Intel Core i7 6700K

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Much newer manufacturing process 14 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 4 GHz vs 3.46 GHz More than 15% higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Higher turbo clock speed 4.2 GHz vs 3.73 GHz Around 15% higher turbo clock speed
Much lower typical power consumption 73.94W vs 105.63W 30% lower typical power consumption
Significantly better PassMark (Single core) score 2,349 vs 1,509 More than 55% better PassMark (Single core) score
Newer Jul, 2015 vs Feb, 2011 Release date over 4 years later
Better PassMark score 11,109 vs 9,389 Around 20% better PassMark score
Better performance per dollar 0.91 pt/$ vs 0.78 pt/$ More than 15% better performance per dollar
Much lower annual home energy cost 21.92 $/year vs 31.32 $/year 30% lower annual home energy cost
Much lower annual commercial energy cost 79.72 $/year vs 113.88 $/year More than 30% lower annual commercial energy cost
Better overclocked clock speed (Water) 4.77 GHz vs 4.47 GHz More than 5% better overclocked clock speed (Water)

Benchmarks Real world tests of Core i7 990X vs 6700K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 990X
14,805
Core i7 6700K
17,583

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 6700K
6,010 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 990X
14,910
Core i7 6700K
17,169

GeekBench

Core i7 990X
17,123
Core i7 6700K
17,169

Cinebench R10 32-Bit

Core i7 990X
30,518
Core i7 6700K
36,746

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 990X  vs
6700K 
Clock speed 3.46 GHz 4 GHz
Turbo clock speed 3.73 GHz 4.2 GHz
Cores Hexa core Quad core
Is unlocked Yes Yes

features

Has a NX bit Yes Yes
Supports trusted computing No 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 130W 91W
Annual home energy cost 31.32 $/year 21.92 $/year
Annual commercial energy cost 113.88 $/year 79.72 $/year
Performance per watt 6.36 pt/W 3.49 pt/W
Typical power consumption 105.63W 73.94W

bus

Architecture QPI FSB
Number of links 1 0
Transfer rate 6,400 MT/s 8,000 MT/s

details

Core i7 990X  vs
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 1 1
Operating temperature Unknown - 67.9°C Unknown - 64°C

overclocking

Overclocked clock speed 4.58 GHz 4.61 GHz
Overclocked clock speed (Water) 4.47 GHz 4.77 GHz
Overclocked clock speed (Air) 4.58 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
DDR3-1066
DDR3
Channels Triple Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,599.99 MB/s 25,600 MB/s
Maximum memory size 24,576 MB 65,536 MB
Intel Core i7 990X
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Intel Core i7 6700K
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