When I have read articles of power supply roundups, I have noticed that you are now testing the power supply efficiency. I think that this is an excellent thing to do, but I do not think you are going far enough.
A power supply that is not very efficient, but has a good power factor may actually perform better than a power supply that is very efficient, but has a poor power factor. For me, one measure of performance is the lack of an excessive bill from the electric company.
The following formula should describe what I am thinking of (of course I could be oversimplifying the problem.):
Power Bill = ((Power used by PC)/((efficiency)*(power factor))
A "perfect" power supply would have a power factor of 1. This number is unobtainable for any practical device except for a purely resistive device such as an electric heater. The expected range of values for a power factor is between 0 and 1 exclusive. Power factor meters are available, though they are expensive.
I did not see any reference to using a power factor meter to determine the power factor of the power supply and this is something most people are not aware of. I think it would be a good thing to make this measurement.
If I have accidentally missed references to power factor in you power supply roundups I apologize in advance.
A power supply that is not very efficient, but has a good power factor may actually perform better than a power supply that is very efficient, but has a poor power factor. For me, one measure of performance is the lack of an excessive bill from the electric company.
The following formula should describe what I am thinking of (of course I could be oversimplifying the problem.):
Power Bill = ((Power used by PC)/((efficiency)*(power factor))
A "perfect" power supply would have a power factor of 1. This number is unobtainable for any practical device except for a purely resistive device such as an electric heater. The expected range of values for a power factor is between 0 and 1 exclusive. Power factor meters are available, though they are expensive.
I did not see any reference to using a power factor meter to determine the power factor of the power supply and this is something most people are not aware of. I think it would be a good thing to make this measurement.
If I have accidentally missed references to power factor in you power supply roundups I apologize in advance.