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power consumption powermac g5

Message #1 - Posted 2005/03/25 - Eckhard Giere

Hi,

sometimes I check the power consumption of my powermac G5 dual 2 GHz with 1.5 MB RAM under OS 10.3.8.

Recently I noticed that it uses about 40 - 44 W in the sleeping mode and even about 31 - 35 W when switched off. A year ago it had been 10 W and 2 W respectively which is what Apple states in some technical document whereas the actual data are much to high.

I tried several things in quest for the cause: Starting from an external drive with OS 10.3.1, reducing the memory, disconnecting any external device... No success.

Has anyone experienced the same phenomenon? Any idea what might be the reason for the exceptional power consumption?

Thanks in advance for any hint.

Eckhard

Message #2 - Posted 2005/03/25 - Repeating Rifle

in article giere-2C8043.11114625032005@news.rz.tu-clausthal.de, Eckhard Giere at giere@math.tu-clausthal.de wrote on 3/25/05 2:11 AM:

Hi,

sometimes I check the power consumption of my powermac G5 dual 2 GHz with 1.5 MB RAM under OS 10.3.8.

Recently I noticed that it uses about 40 - 44 W in the sleeping mode and even about 31 - 35 W when switched off. A year ago it had been 10 W and 2 W respectively which is what Apple states in some technical document whereas the actual data are much to high.

I tried several things in quest for the cause: Starting from an external drive with OS 10.3.1, reducing the memory, disconnecting any external device... No success.

Has anyone experienced the same phenomenon? Any idea what might be the reason for the exceptional power consumption?

Thanks in advance for any hint.

Eckhard

How do you measure the power? Measuring ac volts and amperes and multiplying them will not give a good indication of what actual energy, as summed up by your power company's energy (watt-hour) meter, will indicate. This is especially true for chopping power supplies and peak reading meters that are merely calibrated in rms for pure sine waves.

Bill

Message #3 - Posted 2005/03/26 - Eckhard Giere

Previously, Repeating Rifle wrote:

in article giere-2C8043.11114625032005@news.rz.tu-clausthal.de, Eckhard Giere at giere@math.tu-clausthal.de wrote on 3/25/05 2:11 AM:

Hi,

sometimes I check the power consumption of my powermac G5 dual 2 GHz with 1.5 MB RAM under OS 10.3.8.

Recently I noticed that it uses about 40 - 44 W in the sleeping mode and even about 31 - 35 W when switched off. A year ago it had been 10 W and 2 W respectively which is what Apple states in some technical document whereas the actual data are much to high.

How do you measure the power? Measuring ac volts and amperes and multiplying them will not give a good indication of what actual energy, as summed up by your power company's energy (watt-hour) meter, will indicate. This is especially true for chopping power supplies and peak reading meters that are merely calibrated in rms for pure sine waves.

Bill

I use a device called PeakTech 9024 made in particular for determining the power consumption. I checked it with other consumers whose consumption I knew precisely. So, the measurement seems to be correct.

Today I noticed another strange thing: The meter is installed such that it measures now also the consumption of all devices plugged into a multiple plug. The computer in sleeping mode I switched on the DSL-router and I expected the consumption to increase but the opposite happened, the overall consumption decreased. This means that the consumption of the Powermac decreases considerably when there is a signal at the ethernet port. Very strange.

Any ideas?

Message #4 - Posted 2005/03/26 - Tom Stiller

Previously, Eckhard Giere wrote:

Previously, Repeating Rifle wrote:

in article giere-2C8043.11114625032005@news.rz.tu-clausthal.de, Eckhard Giere at giere@math.tu-clausthal.de wrote on 3/25/05 2:11 AM:

Hi,

sometimes I check the power consumption of my powermac G5 dual 2 GHz with 1.5 MB RAM under OS 10.3.8.

Recently I noticed that it uses about 40 - 44 W in the sleeping mode and even about 31 - 35 W when switched off. A year ago it had been 10 W and 2 W respectively which is what Apple states in some technical document whereas the actual data are much to high.

How do you measure the power? Measuring ac volts and amperes and multiplying them will not give a good indication of what actual energy, as summed up by your power company's energy (watt-hour) meter, will indicate. This is especially true for chopping power supplies and peak reading meters that are merely calibrated in rms for pure sine waves.

Bill

I use a device called PeakTech 9024 made in particular for determining the power consumption. I checked it with other consumers whose consumption I knew precisely. So, the measurement seems to be correct.

Today I noticed another strange thing: The meter is installed such that it measures now also the consumption of all devices plugged into a multiple plug. The computer in sleeping mode I switched on the DSL-router and I expected the consumption to increase but the opposite happened, the overall consumption decreased. This means that the consumption of the Powermac decreases considerably when there is a signal at the ethernet port. Very strange.

Any ideas?

What is the state of the "Wake for Ethernet network administrator access" checkbox in the Energy Saver "Options" pane? Does switching that make any difference?

Tom Stiller

PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF

Message #5 - Posted 2005/03/27 - Eckhard Giere

Previously, Tom Stiller wrote:

Previously, Eckhard Giere wrote:

Previously, Repeating Rifle wrote:

in article giere-2C8043.11114625032005@news.rz.tu-clausthal.de, Eckhard Giere at giere@math.tu-clausthal.de wrote on 3/25/05 2:11 AM:

sometimes I check the power consumption of my powermac G5 dual 2 GHz with 1.5 MB RAM under OS 10.3.8.

Recently I noticed that it uses about 40 - 44 W in the sleeping mode and
even about 31 - 35 W when switched off. A year ago it had been 10 W and 2 W respectively which is what Apple states in some technical document whereas the actual data are much to high.

I use a device called PeakTech 9024 made in particular for determining the power consumption. I checked it with other consumers whose consumption I knew precisely. So, the measurement seems to be correct.

Today I noticed another strange thing: The meter is installed such that it measures now also the consumption of all devices plugged into a multiple plug. The computer in sleeping mode I switched on the DSL-router and I expected the consumption to increase but the opposite happened, the overall consumption decreased. This means that the consumption of the Powermac decreases considerably when there is a signal at the ethernet port. Very strange.

Any ideas?

What is the state of the "Wake for Ethernet network administrator access" checkbox in the Energy Saver "Options" pane? Does switching that make any difference?

The option was deselected but it makes no difference when I choose the option "Wake vor Ethernet network administrator".

Nevertheless, it seems that something is wrong with the Ethernet port. Also, I have still the problem with increased activity of the fans. This was supposed to be bug in 10.3.8.

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