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AMD Phenom II X6 1075T, X4 970, X2 560, Athlon II X4 645, X3 450 & X2 265 Review



Here at OverclockersClub we put our hardware through a rigorous testing program. We use a combination of scientific and video benchmarks designed to push and stress the components, giving us a good idea on how they will perform for us in everyday computing. All of the supporting hardware is run at the same speeds, timings, voltages and latencies to ensure that there are no outside variables that will interfere with the scores.


Testing Setup AMD AM3 Processors:


Testing Setup: Intel Core i5/i7 Socket 1156


Testing Setup: Intel Core i7 Socket 1366


Testing Setup: Intel Core i5 Clarksdale Socket 1156


Comparison CPUs:



Overclocked settings:

  • Processor: AMD Phenom II X6 1075T 4052MHz 270x15
  • Processor: AMD Phenom II X4 970 4133MHz 206x20
  • Processor: AMD Phenom II X2 560 4154MHz 208x20

Overclocking the Phenom II X4 970 and the X2 560 was a snap since they are Black Edition processors with unlocked multipliers. To overclock them I took the voltage to 1.45v and pushed the multiplier up as high as I could while remaining stable. On both of the processors, 20x was the sweet spot. I then started pushing up the reference clock until I was able to sqeeze out a bit more speed, and when the system lost stability I backed off a bit. For the X4 970 I was at 4.133GHz (206x20) and for the X2 560 I was at 4.154GHz (208x20). When it came to the X6 1075T the multi was locked so I had to rely on the reference clock. With a multi of 15x I knew I was limited but I dove in with an open mind. I raised the reference clock 15MHz at a time until I was no longer stable as before. To my surprise I was able to push the clock to 275MHz and boot but it was not stable enough to pass any tests. I slowly backed down the clock 1MHz at a time until I was Prime95 stable and to my amazement, that was at 270MHz on the reference clock! I did have to drop the HT and memory dividers to compensate but my final overclocked speed was 4.052GHz (270x15), which was a whopping 33% total overclock!



Overclocked settings:

  • Processor: AMD Athlon II X4 645 3748MHz 242x15.5
  • Processor: AMD Athlon II X3 450 3765MHz 235x16
  • Processor: AMD Athlon II X2 265 3824MHz 232x16.5

All Athlon II processors have locked multipliers so I had to take the same approach with these as I did with the Phenom II X6 1075T above. I started out by increasing the voltage and reference clock until I was no longer stable. Then I backed off of the speed 1MHz at a time until I was able to pass benchmarks with no errors or issues. For the final overclocked speeds I had 3.748GHz on the Athlon II X4 645, 3.765GHz on the Athlon II X3 450, and 3.824GHz on the Athlon II X2 265.



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. Bibble 5
  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 Arkham Asylum
  4. 3DMark Vantage

  1. Introduction & Closer Look
  2. Specifications & Features
  3. Testing: Setup and Overclocking
  4. Testing: Apophysis, WinRar, Bibble 5
  5. Testing: Office 2007, POV Ray, 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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