![Very Happy :D](./images/smilies/icon_biggrin.gif)
All numbers were derived from the "standard" CPU power usage calculation* based on AMD's TDP figure of 25w for fastest known processor of the MT line, the MT-40 clocked at 2.2GHz.
Please keep in mind, though, that you won't be able to mimic Turion64 power consumption with a 90nm desktop Athlon64, or even a 90nm mobile A64 for that matter. According to AMD, Turion64 uses transistors that have been designed for low-power opteration.
I intend to confirm this soon. I have a 3700+ Athlon64 mobile (basically a San Diego dressed in drag as a S754) and a Turion64 MT-34. I have rigged up a power meter and plan to test power consumption of the system using both processors from the wall at the same clock speed and voltage. Even at the same settings, Turion64 should consume less power, because of its transistor optimizations.
I will then test both processors at undervolted settings and compare the differences in power consumption.
All I'm waiting for now is my DFI to come back from RMA.
![Confused :?](./images/smilies/icon_confused.gif)
* overclocked wattage = default wattage * ( overclocked frequency / default frequency ) * ( overclocked voltage / default voltage )^2
EDIT: A few things I forgot to mention...
I also intend to test how heat effects power consumption of a processor. For example, an actively-cooled Turion64 running at 40*C should consume less power than a passively-cooled Turion64 running at 60*C.
And another thing about your power consumption figures, keep in mind that the circuits providing power to the computer are not 100% efficient. A safe assumption for the CPU power regulation circuitry is about 80%, so that means that the Turion64 at 20.5w would actually need to draw 24.6w from the power supply to get the 20.5w it requies. Then 70% efficiency could be assumed for an average power supply at minimal load, which puts power consumption from the wall for a 20.5w CPU at 32.0w.