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Phenom II X4 955 O/C Performance And Efficiency

Guide: Overclocking AMD And Intel CPUs On A Budget
AMD Phenom II X4 Test Settings


Default Settings

Overclock Settings


AMD Phenom II X4 955 3.2 GHz
2MB L2+6MB L3 Cache, 1.328V

3.86 GHz, (19x 203 MHz), 1.45V


DDR3-1333 CAS 9-9-9-24, 1.50V

DDR3-1624 CAS 6-6-5-18, 1.65V


MSI 790FX-GD70 Socket AM3, 790FX/SB750, BIOS 1.3 (04/27/2009)


Zotac GeForce GTX260²
576MHz GPU, 999 MHz Shader, 896MB GDDR3-2484

Hard Drive

Western Digital VelociRaptor WD30000HLFS
300 MB, 10,000 RPM, 16 MB Cache


Integrated HD Audio


Integrated Gigabit LAN


Operating System

Microsoft Windows Vista Ultimate x64 SP1


GeForce 182.08 Desktop

The X4 955’s 21% overclock probably isn't going to bowl anyone over, but its 3.86 GHz final speed is still well above average for an air-cooled Phenom II system, thanks to the good performance of Rosewill’s Fort 120 cooler.

Sandra shows a 19% improvement in Arithmetic and 20% improvement in Multimedia extensions performance.

Though memory data rate and timings were altered significantly, its performance improved by only 1%. The X4 955 has better base bandwidth than the X2, but apparently less room for improvement.

Power consumption increased by 31%, mostly because of the higher voltage required to reach this high clock speed.

An average CPU performance increase of 20% and an average power increase of 31% caused the overclocked Phenom II X4 to lose around 8% of its original efficiency. Once again, it would likely have been possible to actually increase efficiency by overclocking at or near stock voltage, but the maximum speed increase would have been much smaller. For more on increasing the efficiency of your Phenom II overclock, check out this piece.

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