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• #4492 dezz nagyúr Thrawn #4491

  Új Válasz 2008-02-10 20:40:05 #4492

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  válasz Thrawn #4491 üzenetére

  A hittétel, és a kisujjból szopás feltételezése előtt talán nézz szét egy kicsit.

  "What is interesting is that the power delta between the 9600 and the 9900 does not scale with the frequency difference between a 2.3 GHz and 2.6 GHz CPU. When we overclocked the PHenom 9600 to 2.6 GHz, we measured 82 W under full load which is still worlds apart from the 115 W on the Phenom 9900 under the same conditions. We then increased the core voltage for the 9600 from 1.25V to 1.3 V (the nominal voltage of the 9900) and measured 90.4W, still orders of magnitude below the 9900 at the same speed and voltage. We will have a full discusison of the power profiles towards the end of this article." [link]
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  "A major difference between the Phenom 9700/9900 and the lesser speed grades is that in the latter offerings, the Northbridge, including memory controllers and L3 cache, is running at 10% lower speed, that is 1.8GHz instead of 2 GHz. As mentioned earlier, the NB is running at fixed frequency and also has its own dedicated power supply controlled by the fifth phase of the hybrid voltage regulator. The whole idea is somewhat intriguing, assuming the memory controller runs at a more constant load than a CPU, one wouldn't need as elaborate voltage regulation. Moreover, it becomes possible to uncouple the NB voltage from the CPU supply voltage and, even if the core voltage is increased for overclocking purposes, it would not affect cause an additional voltage-induced power drag on the level of the memory controller. This is important since, as we showed in several earlier articles, the memory controller does eat quite a bit of power and if the same principle is applied to yet another power hog in form of the L3 cache, then one might be able to achieve some significant savings in energy consumption and heat dissipation. Our power measurements show that this is at least worth a discussion. Unfortunately with our methodology it is not possible to dissect core and NB power consumption but the fact that the 9600 at the same core frequency and core supply voltage draws about 25% less power than a 9900 under the same conditions makes a good argument for our claims." [link]

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