CPUBoss Review Our evaluation of 3870K vs 3850 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

No winner declared

Too close to call

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VS

Differences What are the advantages of each

Front view of AMD A8 3870K

Reasons to consider the
AMD A8 3870K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of AMD A8 3850

Reasons to consider the
AMD A8 3850

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CPUBoss is not aware of any important advantages of the 3850 vs the 3870K Black Edition.

Benchmarks Real world tests of A8 3870K vs 3850

CompuBench 1.5 (Bitcoin mining) Data courtesy CompuBench

A8 3870K
46.8 mHash/s
A8 3850
43.84 mHash/s

CompuBench 1.5 (T-Rex) Data courtesy CompuBench

A8 3870K
0.62 fps
A8 3850
0.57 fps

PCMark 8 Home 3.0 Accelerated Data courtesy FutureMark

A8 3870K
2,346
A8 3850
2,056

Sky Diver Data courtesy FutureMark

A8 3870K
2,532
A8 3850
2,425

Cloud Gate Data courtesy FutureMark

A8 3870K
4,726
A8 3850
4,576

GeekBench 3 (Multi-core) Data courtesy Primate Labs

A8 3870K
5,602
A8 3850
5,262

GeekBench 3 (Single core) Data courtesy Primate Labs

A8 3870K
1,597
A8 3850
1,517

GeekBench 3 (AES single core) Data courtesy Primate Labs

A8 3870K
126,200 MB/s
A8 3850
121,450 MB/s

Reviews Word on the street

A8 3870K  vs 3850 

8.0
8.0

8.0
9.0

Overall

8.8 Out of 10
8.9 Out of 10

Specifications Full list of technical specs

summary

A8 3870K  vs
3850 
Clock speed 3 GHz 2.9 GHz
Cores Quad core Quad core
Is unlocked Yes No

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
AMD64
AMD-V
3DNow!
Supports dynamic frequency scaling Yes Yes

integrated graphics

GPU GPU GPU
Label Radeon™ HD 6550D Radeon™ HD 6550D
Latest DirectX 11.0 11.0
GPU clock speed 600 MHz 600 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3-1333

details

A8 3870K  vs
3850 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 4 MB 4 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 32 nm 32 nm
Transistor count 1,178,000,000 1,178,000,000
Max CPUs 1 1
Die size 228 mm² 228 mm²
Voltage range 0.45 - 1.41V 0.91 - 1.41V
Operating temperature Unknown - 72.7°C Unknown - 72.7°C

overclocking

Overclock popularity 32 25
Overclocked clock speed 3.56 GHz 3.54 GHz
Overclocked clock speed (Water) 3.67 GHz 2.9 GHz
PassMark (Overclocked) 2,107.6 2,465.8
Overclocked clock speed (Air) 3.56 GHz 3.54 GHz

power consumption

TDP 100W 100W
Annual home energy cost 40.03 $/year 37.95 $/year
Annual commercial energy cost 138.41 $/year 107.75 $/year
Performance per watt 1.03 pt/W 1.39 pt/W
Idle power consumption 47W 62.4W
Peak power consumption 158W 123W
Typical power consumption N/A 107.85W
AMD A8 3870K
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AMD A8 3850
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