CPUBoss Review Our evaluation of 965 vs 6600K 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

8.8

CPUBoss Score

Combination of all six facets

Winner
Intel Core i5 6600K 

CPUBoss recommends the Intel Core i5 6600K  based on its performance, single-core performance and value.

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VS
Front view of Intel Core i5 6600K

Intel Core i5 6600K

CPUBoss Winner

Differences What are the advantages of each

Front view of Intel Core i7 965

Reasons to consider the
Intel Core i7 965

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Much better 3DMark06 CPU score 8,314 vs 67.7 More than 122.8x better 3DMark06 CPU score
Much more l2 cache 4 MB vs 1 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Slightly more l3 cache 8 MB vs 6 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 8 vs 4 Twice as many threads
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 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 i5 6600K

Reasons to consider the
Intel Core i5 6600K

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Much newer manufacturing process 14 nm vs 45 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
Higher turbo clock speed 3.9 GHz vs 3.46 GHz Around 15% higher turbo clock speed
Higher clock speed 3.5 GHz vs 3.2 GHz Around 10% higher clock speed
Much lower typical power consumption 73.94W vs 105.63W 30% lower typical power consumption
Much better performance per dollar 0.89 pt/$ vs 0.21 pt/$ Around 4.2x better performance per dollar
Significantly better PassMark (Single core) score 2,148 vs 1,383 More than 55% better PassMark (Single core) score
Newer Jul, 2015 vs Nov, 2008 Release date over 6 years later
Better PassMark score 8,012 vs 5,888 More than 35% better PassMark score
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 performance per watt 2.45 pt/W vs 1.62 pt/W More than 50% better performance per watt
Significantly better overclocked clock speed (Water) 4.57 GHz vs 3.73 GHz More than 20% better overclocked clock speed (Water)

Benchmarks Real world tests of Core i7 965 vs i5 6600K

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

Core i7 965
142,500 MB/s
Core i5 6600K
209.7 MB/s

3D Mark 06 (CPU)

Cinebench R10 32-Bit

Core i7 965
18,810
Core i5 6600K
29,116

Cinebench R10 32-Bit (Single Core)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 965  vs
i5 6600K 
Clock speed 3.2 GHz 3.5 GHz
Turbo clock speed 3.46 GHz 3.9 GHz
Cores Quad 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 1.62 pt/W 2.45 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 965  vs
i5 6600K 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 4 MB 1 MB
L2 cache per core 1 MB/core 0.25 MB/core
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 45 nm 14 nm
Max CPUs 1 1
Operating temperature Unknown - 67.9°C Unknown - 64°C

overclocking

Overclocked clock speed 4.54 GHz 4.54 GHz
Overclocked clock speed (Water) 3.73 GHz 4.57 GHz
Overclocked clock speed (Air) 4.54 GHz 4.54 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
DDR3-800
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 965
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Intel Core i5 6600K
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