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AMD Athlon II X4 640 Processor Review



To test the AMD Athlon II X4 640, I subjected it to a series of strenuous benchmarks that stress the components to their peak. The benchmarks consist of both scientific calculation tests and video tests that push either the CPU or the system as a whole to see how well it stands up under pressure. I then compared the scores to a number of other processors on the market, ranging from dual core processors to the latest hex core processors. I also compared the X4 640 against the Athlon II X4 635 so that you can get a look at how the extra bump in speed makes much of a difference. All of the hardware was tested using the stated speeds, timings, and voltages for each test.



Testing Setup AMD Six Core:


Testing Setup AMD Six Core:


Testing Setup: Intel Core i7 Socket 1366


Testing Setup: Intel Core i5/i7 Socket 1156

  • Processor(s): Intel Core i5 750 133x20 socket 1156 CPU's
  • Motherboard: Intel DP55KG Extreme (Kingsberg)
  • Memory: Kingston HyperX KHX1600C*D3K2/4GX 2x2Gb 7-7-7-20 1333MHz
  • Video Card : XFX Radeon HD 5870
  • Power Supply: Mushkin 800w Modular Power Supply
  • Hard Drive: 1 x Seagate 1TB SATA
  • Optical Drive: Lite-On 8x DVD+/-RW
  • OS: Windows Vista Ultimate Edition


Comparison CPUs:



Overclocked settings:

  • Processor: AMD Athlon II X4 640 @ 3.767GHz (251x15) 1.44v

Since the Athlon II X4 640 is not a "Black Edition" with an unlocked multiplier, overclocking the system requires adjusting the voltage and the reference clock speed. Since I wanted to find the most stable highest overclock, I pushed the voltage up to 1.44v, which is where I knew I was safe especially under water cooling. I then pushed up the reference clock 10MHz at a time, adjusting the memory divider and HyperTransport divider at the same time, keeping them at stable speeds. I was able to boot into the computer at 260MHz on the reference clock however; it would not remain stable. I backed down the reference clock a little bit at a time until I was able to pass Prime95 for an hour with no issues. The final speed on the reference clock was 251MHz, which gave me a clock speed of 3.767GHz or 251MHz x 15 at 1.44 volts. During the one hour stability test, the maximum temperature the processor reached was only 53°C, which is way below the rated 71°C maximum which makes it a very safe overclock.





Maximum Clock Speeds:

Each CPU has been tested for stability at the clock speeds listed when in an overclocked state. These clock speeds will represent the overclocked scores in the testing.




  • Scientific & Data:
  1. Apophysis
  2. WinRAR
  3. Office 2007 Excel Number Crunch
  4. POV Ray 3.7
  5. PCMark Vantage Professional
  6. Sandra XII
  7. ScienceMark 2.02
  8. Cinebench 10 & 11.5
  9. HD Tune 3.50
  • Video:
  1. Far Cry 2
  2. Call of Duty Modern Warfare 2
  3. Batman Arkam Asylum
  4. 3DMark Vantage

  1. Introduction & Closer Look
  2. Specfications & Features
  3. Testing: Setup and Overclocking
  4. Testing: Apophysis, WinRar
  5. Testing: Office 2007, POV Ray, PCMark Vantage, Geekbench
  6. Testing: SiSoft Sandra
  7. Testing: Sciencemark, Cinebench, HD Tune
  8. Testing: Far Cry 2
  9. Testing: Call of Duty Modern Warfare 2
  10. Testing: Batman Arkham Asylum
  11. Testing: 3DMark Vantage
  12. Conclusion
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