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Written by Michael Schuette
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Jan 05, 2009 at 04:00 PM |
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Page 7 of 18
Full Load
Under full load, AMD claims a reduction in power of 30-40% compared to the Phenom 9950.
CPU-Z screenshot under full load. Note the core speed of 3.0 GHz and the voltage of 1.35V . AOD also showed 1.35V but curiously, ASUS hardware monitor showed 1.42V at default settings. Given the overall power numbers, we tend to believe AOD and CPUZ rather than the BIOS GUI.
We measured (before the VRM) 68W and 77.2W for the ASUS M3A78-T and the Gigabyte GAMA79GP-DS4H, respectively, which matches the expectations based on AMD's projections. For completeness, we also took measurements again of the Phenom 9950 at 2.6GHz and under default setup conditions, coming in at 98W and indicating that given the near-identical readings of power draw under heavy load, indeed, power savings features may not have been fully functional in our initial measurements, which skewed the results, whereas the methodology seems to hold, On a side note, after disabling C1 states in the ASUS M3A78-T BIOS, the power consumption of the Phenom X4 9950 went up again to ~30W.
In the final analysis, it certainly appears as if AMD has achieved the goal of reducing power consumption anywhere between 30 and 50% depending on load. Bear in mind that these numbers are not power per clock or normalized values but actual numbers reflecting a 3.0 GHz part compared to a 2.6 GHz part.
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Last Updated ( Feb 01, 2009 at 03:24 AM )
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