AMD Phenom II X4 955 

Released November, 2009
  • 3.2 GHz
  • Quad core
  • Unlocked
4.2 Out of 10

AMD has designed its Phenom II X4 955 Black Edition with an unlocked multiplier, for added ease of overclocking.
by PCMag (Oct, 2011)
Like the title says really, I got revision C3 and it easily overclocks to 4 GHz even on a motherboard (Gigabyte GA-M68MT-S2p) with RAM (No-name generic) that really isn't designed for overclocking.
by andrews2547 (Feb, 2012)

CPUBoss Review Our evaluation of the AMD Phenom II X4 955 among desktop CPUs (over 75W)


Benchmark performance using all cores

Phenom II X4 955
FX 6300
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

Phenom II X4 955
FX 6300
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Phenom II X4 955
FX 6300
Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

Phenom II X4 955
FX 6300
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Phenom II X4 955
FX 6300
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


Are you paying a premium for performance?

Phenom II X4 955
FX 6300
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


CPUBoss Score

Combination of all six facets

Phenom II X4 955
FX 6300

Benchmarks Real world tests of the AMD Phenom II X4 955

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Phenom II X4 955
FX 6300

GeekBench 3 (Single core) Data courtesy Primate Labs

Phenom II X4 955
FX 6300

GeekBench 3 (AES single core) Data courtesy Primate Labs

Phenom II X4 955
129,850 MB/s
FX 6300
2,290,000 MB/s
Core2 Quad Q6600
102,800 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Phenom II X4 955
FX 6300

GeekBench (64-bit) Data courtesy Primate Labs

Phenom II X4 955
FX 6300


Phenom II X4 955
FX 6300

PassMark Data courtesy Passmark

Phenom II X4 955
FX 6300

PassMark (Single Core)

Phenom II X4 955
FX 6300

Reviews Word on the street for the AMD Phenom II X4 955

In that context, the 955's overclocking prowess is more interesting.

I think its one of the best CPU's for a budget gaming build.


8.8 Out of 10

What People Are Saying Give it to me straight

Socket Type

Editor's Note: Just for fun we also ran the memory at 800MHz with 4-4-4-12 timings and found the average bandwidth to be reduced to 10,656 MB/s from the 12,949 MB/s shown in the chart above.
by Legit Reviews (May, 2009)
This 64-bit chip is based on the Deneb processing core, and was developed using AMD's 45nm production process.
by PCMag (Oct, 2011)
Purchased less than a month ago and its max overclock was equal to that of my PII x4 820 and temps were 20C+ higher and it took more wattage.
by grubby99 (May, 2012)


By just raising the multiplier we were able to easily reach 3.80GHz, which is an overclock of 600MHz with no voltage changes at all.
by Legit Reviews (May, 2009)
However, our initial efforts at increased voltages hit the wall at 3.7GHz, which isn't higher than what we achieved with an overvolted 940.
by Tech Radar (Jun, 2009)
Benchmark Results with a GeForce GTX 295 Graphics Card: World In Conflict showed the AMD Phenom II X4 955 Black Edition was clearly in the lead and rightly so as it has a faster clock frequency and more physical cores.
by Legit Reviews (May, 2009)


Looking ahead, Intel has the Core i5 series (Lynnfield) of processors in the works.
by Legit Reviews (May, 2009)
X4, of course, indicates four cores, which is as good as it currently gets.
by Tech Radar (Jun, 2009)
If you enable AMD Cool'n'Quiet the processor will automatically reduce it's internal multiplier down to x4 and lower the core voltage for power savings.
by Legit Reviews (May, 2009)


What you do get is an incremental improvement over a chip that already delivered extremely satisfactory performance.
by Tech Radar (Jun, 2009)
When it comes to benchmarks, the overclocked Phenom II X4 955 processor was nearly 20% quicker!
by Legit Reviews (May, 2009)
Legit Bottom Line: The AMD Phenom II X4 955 Black Edition is the fastest desktop processor in AMD's aresnal and rightly so, as it supports socket AM3 technology and a 3.2GHz clock frequency.
by Legit Reviews (May, 2009)


love this cheap when i had it but water pump stop working and blow chip and amd would not warrenty it as i bent to meny pins apperently but would by agian if price right.
by skyline_king88 (Apr, 2012)
Performance is key when it comes to choosing a processor and the Phenom II X4 955 proved to be tough competition to the slightly more expensive Intel Q9550 processor.
by Legit Reviews (May, 2009)

Specifications Full list of technical specs


Clock speed 3.2 GHz
Cores Quad core
Socket type AM3
Is unlocked Yes


Has a NX bit Yes
Has virtualization support Yes
Instruction set extensions
  1. MMX
  2. SSE
  3. SSE2
  4. 3DNow!
  5. SSE4a
  6. SSE3
Supports dynamic frequency scaling Yes

integrated graphics

GPU None


Architecture x86-64
Threads 4 threads
L2 cache 2 MB
L2 cache per core 0.5 MB/core
L3 cache 6 MB
L3 cache per core 1.5 MB/core
Manufacture process 45 nm
Max CPUs 1
Voltage range 0.88 - 1.5V
Operating temperature Unknown - 62°C


Overclock popularity 259
Overclock review score 4
Overclocked clock speed 3.99 GHz
Overclocked clock speed (Water) 4.14 GHz
PassMark (Overclocked) 3,674.7
Overclocked clock speed (Air) 3.99 GHz

power consumption

TDP 125W
Annual home energy cost 30.11 $/year
Annual commercial energy cost 109.5 $/year
Performance per watt 1.29 pt/W
Typical power consumption 101.56W


Clock speed 2,000 MHz
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