Meh, is there anything I calculated correctly?
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AMD FX8350 Linux PerformancePerWatt
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@Michael:
Reading the article, every test result my brain stretched and wondered what was wrong. Yet, as mcgreg already said, the only really valid number to compare the processors' efficiency is to calculate the energy which is needed to get the job done. And this, Michael, should be sone by calculating the integral of your W(t) curves... As you have discrete measurements with a fixed step size in time, dt, it's nothing more than a sum over all measurements, multiplied by dt.
dt * \sum_{i=0}^{N} W_i
If you know how many floating point operations this task needs, you can calculate the energy per floating point operation  which is the same as the average number of Watts per Speed (measured in flop / sec).
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I'm sorry but the performance per watt graphs are wrong, that is assuming the power consumption graphs are correct, for example in the CRay test the blue line is both higher and longer than the green line, so the system in blue (AMD FX8150 @ 4.00 Ghz) took more power at each moment in time and also took more time to complete the test than the system in green (AMD FX8350)  yet the performance per watt says that more is better and green is lower than blue (which from the other graph should green should have more) ... so either less is better in the performance per watt graphs or the formula used for the calculation is wrong.
Numbers
 green took 31.45 seconds @ 220 Watts
 blue took 33.03 seconds @ 262 Watts
So in performance per watt, green is the obvious winner  less time to finish, less average power.Last edited by xception; 28 October 2012, 06:33 AM.
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Originally posted by xception View PostI'm sorry but the performance per watt graphs are wrong
Originally posted by xception View PostNumbers
 green took 31.45 seconds @ 220 Watts
 blue took 33.03 seconds @ 262 Watts
So in performance per watt, green is the obvious winner  less time to finish, less average power.
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