AMD A8 3870K 

Released December, 2011
  • 3 GHz
  • Quad core
  • Unlocked
3.6 Out of 10

The good news is that it surpasses its predecessor, the A8-3850, in every way (if only slightly), and provides overclocking features and performance potential beyond what you may think you can expect from a chip with a $135 (list) price—whether from AMD or Intel.
by PCMag (Jan, 2012)
This dual channel memory kit runs at 1333MHz and features CL9 timings (9-9-9-24) at 1.50V. With a lifetime warranty and a $22 price tag it is hard to go wrong with a memory kit like this.
by Legit Reviews (Aug, 2012)

CPUBoss Review Our evaluation of the AMD A8 3870K among desktop CPUs (over 75W)


Benchmark performance using all cores

A8 3870K
FX 6300
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

A8 3870K
FX 6300
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

A8 3870K
FX 6300
Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

A8 3870K
FX 6300
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

A8 3870K
FX 6300
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


Are you paying a premium for performance?

A8 3870K
FX 6300
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


CPUBoss Score

Combination of all six facets

A8 3870K
FX 6300

Benchmarks Real world tests of the AMD A8 3870K

CompuBench 1.5 (Bitcoin mining) Data courtesy CompuBench

A8 3870K
46.8 mHash/s
FX 6300

CompuBench 1.5 (T-Rex) Data courtesy CompuBench

A8 3870K
0.62 fps
FX 6300

PCMark 8 Home 3.0 Accelerated Data courtesy FutureMark

A8 3870K
FX 6300

Sky Diver Data courtesy FutureMark

A8 3870K
FX 6300

Cloud Gate Data courtesy FutureMark

A8 3870K
FX 6300

GeekBench 3 (Multi-core) Data courtesy Primate Labs

A8 3870K
FX 6300

GeekBench 3 (Single core) Data courtesy Primate Labs

A8 3870K
FX 6300

GeekBench 3 (AES single core) Data courtesy Primate Labs

A8 3870K
126,200 MB/s
FX 6300
2,290,000 MB/s
Athlon II X4 651
125,700 MB/s

Reviews Word on the street for the AMD A8 3870K

We had very little trouble nudging the GPU clock up from 600MHz to 900MHz and the CPU clock from 3GHz to 3.5GHz, using just a basic air cooler—and AMD tells us that, with more aggressive cooling and fine tuning of voltages, a combo rate of 960MHz/3.8GHz is possible.

That feature is Asymetrical Crossfire – the ability to use both the A8-3870K's graphics and a low power GPU, such as an AMD HD 6670, for a gaming experience that's capable of playing most games at 1080p with medium settings.

Pair this with a decent CPU cooler and you got your self the best sub 500 dollar gaming rig I have ever seen.


8.8 Out of 10

What People Are Saying Give it to me straight

Socket Type

Pretty impressive speeds considering that this SSD runs just $29.99 shipped after a $20 rebate.
by Legit Reviews (Aug, 2012)
The CPU core on the newer chip has been bumped up from 2.9GHz to 3GHz, though the GPU clock remains unchanged at 600MHz—but both are now unlocked.
by PCMag (Jan, 2012)
OCZ rates the Vertex Plus R2 60GB SSD as having a peak sequential read speed of 180MB/s and a write speed of 80MB/, so we are close to these numbers.
by Legit Reviews (Aug, 2012)


The new OCZ Vertex Plus R2 was much faster with a sequential read speed of 166.7MB/s and a write speed of 82.22MB/s..
by Legit Reviews (Aug, 2012)
As you can see from the photo above you have two DDR3 memory slots, four SATA II ports, one PCIe x16 slot, a PCIe x1 slot and a old school PCI slot.
by Legit Reviews (Aug, 2012)
The OCZ Vertex Plus R2 uses an Indilinx controller and has a peak sequential read speed of 180MB/s and a write speed of 80MB/s..
by Legit Reviews (Aug, 2012)


This system can easily perform mainstream tasks like web browsing and office work with ease and can even do some light gaming.
by Legit Reviews (Aug, 2012)
Enough that while it's not going to be our chip of choice for a workstation or enthusiast games rig, if you want a small, low cost PC which is capable of occasional games at console quality, it's a steal.
by Tech Radar (Jan, 2012)
Not only can this thing handle most games at low to medium settings, It can also be overclocked well.
by Dimaggio1103 (Jun, 2012)


Plus, you get an increase in overall system performance, which helps you become more productive and have a more enjoyable experience!
by Legit Reviews (Aug, 2012)
With more fine-tuning and a really good cooler, we've seen reports of much higher clockspeeds, but we're not overly sure it's ultimately worth it for the performance returns.
by Tech Radar (Jan, 2012)
Pictured above are the two systems that we will be comparing the performance of.
by Legit Reviews (Aug, 2012)


If you're thinking of adding in a mid-range card like the HD 6870 or even something as powerful as an Nvidia GeForce GTX 560Ti, though, Intel just wins through – although it's a draw in CPU limited games like Shogun 2 and Skyrim.
by Tech Radar (Jan, 2012)
When it comes to 3D tasks like gaming, the on board HD6550D is simply in a different league to Intel's laggardly HD Graphics 3000 cores.
by Tech Radar (Jan, 2012)
Because it has four native cores it outperforms Core i3 in tasks like media rendering and so on, although Intel's computational engine is still superior in games – even if its graphics lags far behind.
by Tech Radar (Jan, 2012)

Specifications Full list of technical specs


Clock speed 3 GHz
Cores Quad core
Socket type FM1
Is unlocked Yes


Has a NX bit Yes
Supports trusted computing Yes
Has virtualization support Yes
Instruction set extensions
  1. 3DNow!
  2. AMD-V
  3. AMD64
  4. MMX
  5. SSE
  6. SSE2
  7. SSE3
  8. SSE4a
Supports dynamic frequency scaling Yes

integrated graphics

Label Radeon™ HD 6550D
Latest DirectX 11.0
Number of displays supported 2
GPU clock speed 600 MHz
Turbo clock speed 600 MHz

memory controller

Memory controller Built-in
Memory type
  1. DDR3-1866
  2. DDR3-1600
  3. DDR3-1333
Channels Dual Channel
Supports ECC No
Maximum bandwidth 29,866.66 MB/s
Maximum memory size 32,768 MB


Architecture x86-64
Threads 4 threads
L2 cache 4 MB
L2 cache per core 1 MB/core
Manufacture process 32 nm
Transistor count 1,178,000,000
Max CPUs 1
Die size 228 mm²
Clock multiplier 30
Voltage range 0.45 - 1.41V
Operating temperature Unknown - 72.7°C


Overclock popularity 32
Overclock review score 5
Overclocked clock speed 3.56 GHz
Overclocked clock speed (Water) 3.67 GHz
PassMark (Overclocked) 2,107.6
Overclocked clock speed (Air) 3.56 GHz

power consumption

TDP 100W
Annual home energy cost 40.03 $/year
Annual commercial energy cost 138.41 $/year
Performance per watt 1.03 pt/W
Idle power consumption 47W
Peak power consumption 158W


Architecture FSB
Data rate 3,200 MB/s
Transfer rate 3,200 MT/s
Clock speed 100 MHz
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