CPUBoss Review Our evaluation of 4771 vs 4820k


Benchmark performance using all cores

Passmark and GeekBench (32-bit)

Single-core Performance

Individual core benchmark performance

Passmark (Single Core)


How much speed can you get out of the processor?



Are you paying a premium for performance?

Performance Per Dollar

CPUBoss Score

Performance, Single-core Performance, Overclocking and Value

Intel Core I7 4820k 

CPUBoss recommends the Intel Core I7 4820k  based on its value.

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Front view of Intel Core I7 4820k

Intel Core I7 4820k

CPUBoss Winner

Differences What are the advantages of each

Front view of Intel Core i7 4771

Reasons to consider the
Intel Core i7 4771

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Significantly lower typical power consumption 68.25W vs 105.63W More than 35% lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Higher Maximum Operating Temperature 72 °C vs 66.8 °C Around 10% higher Maximum Operating Temperature
Better PassMark (Single core) score 2,245 vs 2,030 More than 10% better PassMark (Single core) score
Better performance per watt 17.24 pt/W vs 13.47 pt/W Around 30% better performance per watt
Significantly lower annual commercial energy cost 73.58 $/year vs 113.88 $/year More than 35% lower annual commercial energy cost
Significantly lower annual home energy cost 20.24 $/year vs 31.32 $/year More than 35% lower annual home energy cost
Front view of Intel Core I7 4820k

Reasons to consider the
Intel Core I7 4820k

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Supports more RAM 65,536 MB vs 32,768 MB Supports 2x more RAM
More l3 cache 10 MB vs 8 MB 25% more l3 cache; more data can be stored in the l3 cache for quick access later
Higher clock speed 3.7 GHz vs 3.5 GHz More than 5% higher clock speed
Better 3DMark11 physics score 11,580 vs 9,140 More than 25% better 3DMark11 physics score
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
Better performance per dollar 5.27 pt/$ vs 4.52 pt/$ More than 15% better performance per dollar

Benchmarks Real world tests of Core i7 4771 vs I7 4820k

GeekBench (32-bit)

Core i7 4771
Core I7 4820k


Core i7 4771
Core I7 4820k

3D Mark 11 (Physics)

Core i7 4771 Core I7 4820k @ community.futuremark.com

Passmark (Single Core)

Specifications Full list of technical specs


Core i7 4771  vs
I7 4820k 
Clock speed 3.5 GHz 3.7 GHz
Turbo clock speed 3.9 GHz 3.9 GHz
Cores Quad core Quad core
Is unlocked No Yes
Is hyperthreaded Yes Yes


Has a NX bit Yes Yes
Supports trusted computing Yes No
Has vitualization support Yes Yes
Supplemental SSE3
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 84W 130W
Annual home energy cost 20.24 $/year 31.32 $/year
Annual commercial energy cost 73.58 $/year 113.88 $/year
Performance per watt 17.24 pt/W 13.47 pt/W
Typical power consumption 68.25W 105.63W


Architecture DMI DMI
Number of links 0 1
Transfer rate 5,000 MT/s 5,000 MT/s


Core i7 4771  vs
I7 4820k 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 10 MB
L3 cache per core 2 MB/core 2.5 MB/core
Manufacture process 22 nms 22 nms
Max CPUs 1 1
Operating temperature Unknown - 72°C Unknown - 66.8°C


Label Intel HD Graphics 4600 N/A
Number of displays supported 3 N/A
GPU clock speed 350 MHz N/A
Turbo clock speed 1,200 MHz N/A

memory controller

Memory controller Built-in Built-in
Memory type
Channels Dual Channel Quad Channel
Supports ECC No No
Maximum bandwidth 25,600 MB/s 59,733.32 MB/s
Maximum memory size 32,768 MB 65,536 MB
Intel Core i7 4771
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Intel Core I7 4820k
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Showing 1 comment.
In reality 4771 is better. About same performance or sometimes better and much lower power consumption. New instructions too. And the 4820k 3d mark 11 is probably from overclocked bencmarks from the futuremark community.
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