CPUBoss Review Our evaluation of 4820K vs 4771 among desktop CPUs (over 75W)

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

Fire Strike

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?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

8.9

CPUBoss Score

Combination of all six facets

Winner
Intel Core i7 4771 

CPUBoss recommends the Intel Core i7 4771  based on its single-core performance and power consumption.

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VS
Front view of Intel Core i7 4771

Intel Core i7 4771

CPUBoss Winner

Differences What are the advantages of each

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
Higher clock speed 3.7 GHz vs 3.5 GHz More than 5% higher clock speed
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
Supports more RAM 65,536 MB vs 32,768 MB Supports 2x more RAM
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
Slightly better performance per dollar 3.79 pt/$ vs 3.04 pt/$ More than 25% better performance per dollar
Front view of Intel Core i7 4771

Reasons to consider the
Intel Core i7 4771

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Much higher Maximum operating temperature 72 °C vs 66.8 °C Around 10% higher Maximum operating temperature
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much 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
Significantly better performance per watt 11.59 pt/W vs 7.59 pt/W Around 55% better performance per watt
Better geekbench 3 single core score 3,555 vs 3,291 Around 10% better geekbench 3 single core score
Much lower annual home energy cost 20.24 $/year vs 31.32 $/year More than 35% lower annual home energy cost
Much lower annual commercial energy cost 73.58 $/year vs 113.88 $/year More than 35% lower annual commercial energy cost

Benchmarks Real world tests of Core i7 4820K vs 4771

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 4820K
13,311
Core i7 4771
13,272

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 4820K
2,500,000 MB/s
Core i7 4771
4,660,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 4820K
13,645
Core i7 4771
13,089

GeekBench (64-bit) Data courtesy Primate Labs

Core i7 4820K
14,931
Core i7 4771
14,457

GeekBench

Core i7 4820K
14,931
Core i7 4771
14,457

3D Mark 11 (Physics)

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Core i7 4820K  vs
4771 
Clock speed 3.7 GHz 3.5 GHz
Turbo clock speed 3.9 GHz 3.9 GHz
Cores Quad core Quad core
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
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3-1333
DDR3L-1333
DDR3
Channels Quad Channel Dual Channel
Supports ECC No No
Maximum bandwidth 59,733.32 MB/s 25,600 MB/s
Maximum memory size 65,536 MB 32,768 MB

details

Core i7 4820K  vs
4771 
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 10 MB 8 MB
L3 cache per core 2.5 MB/core 2 MB/core
Manufacture process 22 nm 22 nm
Max CPUs 1 1
Operating temperature Unknown - 66.8°C Unknown - 72°C

integrated graphics

GPU None GPU
Label N/A Intel HD Graphics 4600
Number of displays supported N/A 3
GPU clock speed N/A 350 MHz
Turbo clock speed N/A 1,200 MHz

power consumption

TDP 130W 84W
Annual home energy cost 31.32 $/year 20.24 $/year
Annual commercial energy cost 113.88 $/year 73.58 $/year
Performance per watt 7.59 pt/W 11.59 pt/W
Typical power consumption 105.63W 68.25W

bus

Architecture DMI 2.0 DMI
Number of links 1 0
Transfer rate 5,000 MT/s 5,000 MT/s
Intel Core i7 4820K
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Intel Core i7 4771
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