Geit,

actually, PowerBooks, minis, iBooks and G4 Power Macs do run at full speed, but support the NAP feature of the G4. Additionally, 1.67GHz PowerBooks support DFS2, meaning they run at half CPU clock when idle (and NAP as well).

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Uff, so it's not only me ;P

My PowerBook:
Load 59°C
UnLoad 41°C

PowerMac G5 2.7 GHz: 86°-93°, when running longer even up to 102°

@geit: Thanx for explanation. Now I know why fans under MOS run always at full speed (quite noisy). The machine is really a lot(!) faster than my G4 1.5 GHz. Watching 1080p Videos at full speed and having just 35% CPU usage is really cool. But cause of the noise I doubt the G5 will replace my G4 as my main machine. It's a pity.

I was surprised that the temperature is already 86° immediately after switching on the machine, even if ist wasn't used for hours...

pOS,
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You should consider a proper rework of your G5s cooling system.

Geit

I think the temperatur sensor on my Powerbook is a bit weird/buggy. Under full load the temp goes up to about 58C and then sometimes jumps to 75C in a second. fan is spinning and it quickly jumps back to 58C or whatever the last shown temp before the jump to 75C was. When idle it is at about 40C (± e few Cs depending on environment temp).

Zylesea,
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Well, first of all the temperature is updated in intervals, so you will not see any slow movement.

Secondly you seem to have no idea how much heat a cpu can create within a second. If you take a cpu without any cooling, put your finger on the cpu and turn the computer on for a second, your finger is most likly burned.

Geit

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I am not really that clueless abot semiconductors as you may assume and know pretty well how hot a cpu can get . The funny thing is that the jump between 58C and 75C is w/o a step inbetween while it takes a while to cool down even a _single_ more degree. As much as I know about thermodynamics and current I think I would expect an exponential function, but acually I observed a step function between 58C & 75C and from and till 58C again the function is exponential as expected.

Well, my 2xG5/2.5 GHz is much much quieter than my FW800 2xG4/1.8 GHz, I'd say, it's a quiet as my previous supersilent Pegasos. And when it's on it's 86 degrees, it's still pretty quiet...

Martin.

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@ Geit

And could you please tell how to do that properly? What tools are needed and can it be done by itself?

Thanks in advance for help.

Regards

Christoph

My Passive cooled 2.7ghz is at 86.4C when I do nothing, but when I put it under 100% load by playing a 1080P video (Which btw it can't do smoothly if you were wondering.) and it never went over 88.9c. Fans stay quiet and spin up very little.

My other LCS 2.7ghz setup has the newer revised cooler by Panasonic, and that guy sits at 84c without doing anything, and it never goes passed 86.5c under 100% load.

The spare 2.0 G5s I have will hover mid 40s.

Well, MPlayer can't play MP4 files at full speed with 100% load, but when playing avi file, with even higher bitrate, the replay is smooth at about 30-40% load, ofcourse i am talking about 1080p videos :)

And top temperature was about 88 degs, and the machine (2xG5/2.5) wass still pretty quiet. Well, i can't hear it at all, when my 2xG4/1.8 is on :)

Martin.

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@Doffo and Mark

h264 1080p is certainly doable on a 2.5 or 2.7GHz machine. It's even ok on my 2.3GHz.

What about some examples of these files that wouldn't play at full speed ?

Better make sure you enable cache in mplayer or have sufficient i/o speed of course. These files may not play fluently over a slow smbfs link (for instance... :)).


[ Edited by Fab 05.06.2013 - 06:46 ]

rms,
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I heard and saw what is required to do it, which convinced me that - if I would own a G5 with liquid cooling - I would leave that to experts.

It is not only about the knowledge. I guess everybody can remove an reattach such cooling, when he takes his time. It is more the detail work and the tools you need.

Basic plumber skills come in handy. You need to know a way to get any air from the system. All connections must be clean and fit perfect. The pipes need to be cleaned from the inside. The cpu mounted cooler need to be cleaned from the inside. You need proper material to seal everything, cooling paste and finally you need specific software to calibrate the system again. Well, this also implies that you had a custom made wrench to reach the places to unmount the entire stuff in the first place.

Same btw goes for the air cooled system. If you remove a broken fan, just replacing it will not helpl. Without running a proper recalibration the system will run the other fans still at maximum speed.

After hearing about what it takes to do it right, I would hand over the system to someone who knows what he is doing and at least did that a few times with his own systems. I am unable to do it myself.

If someone thinks he is qualified, because he dismantled and rebuild a PowerMac G4 from scratch, then he is totally wrong. The G5 systems are not only speed wise playing in another league.

Geit


[ Edited by geit 05.06.2013 - 10:27 ]

Well... I guess it's not extremely difficult to try.
Though Powermacs G5 are another world (yup!) compared with G4 (and with anything else, I suppose..) I'd rather sure to perform all operations.
I have to say I've dismounted two G5 dual 2.7 (one of them is a skeleton now!) to recover parts of one and to clean and check for leaking of the other. You need the right tools, spare parts, ASD disc for calibrate cpu and fans and a whole set of patience. Obviously, reading carefully every sort of documentation that it's possible to find online and go step by step.
Interesting thread about repairing a LCS of a dual 2.7:
http://forums.macrumors.com/showthread.php?t=1109014
Pumps for liquid cooled system (just in case...):
Swiftech 12V DC Water Cooling Pump - MCP350
Viton O-Rings to replace:
Viton O-Rings
Video about how to calibrate a G5:
Powermac G5 fan calibration
and so on.
Yes, this is not an easy operation but I would (and probabily will) do to my G5.

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i tried the mp4 file that is created on keepvid.com . just picked a youtube video and had the other site save it in 1080p. I will have to try another format. 1080p was playing but desync

geit,
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May I ask why? I believe on MacOS X the G5 powermacs are NAP, but the G4 ones not.

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Ok, i'll try that. With a high bitrate, it's still possible some H264 full hd files are too demanding for a G5. To be checked.


[ Edited by Fab 05.06.2013 - 17:48 ]

>> PowerMacs G5 run at full speed. PowerBooks, iBooks and Minis do not.

> May I ask why? I believe on MacOS X the G5 powermacs are NAP,
> but the G4 ones not.

Because on MorphOS, Nap support probably isn't implemented for G5 (yet?).
Regarding Nap support for PowerMac G4 on OSX, the situation is more complicated apparently:

http://www.xlr8yourmac.com/feedback/MDD_CHUD_feedback.html

Hello,

On warm boot the cpu of my powermac mdd is ~34/35°. Yesterady evening I did a try by viewing a 1080p video avi of big buck bunny, prometheus trailer and an other one. The g4 seemed able to play them without any slowing down. After 1 hour the temperature was ~44/45°. I want to clarify that I have not removed the processor card nor changed the thermal paste. So would I have a problem with the cpu sensor ? When I got my powermac mdd it was very dusty. I used an air bomb to clean it, I removed the fan and I cleaned it. When it works I most ear the power supply fans, very rarely the cpu fan.

Someone has told about asd software to calibrate the cpu sensor. Where is it possible to find it ? Is it free or not ?

Brumiga

[ Edité par Brumiga 06.06.2013 - 14:56 ]

Hi Brumiga!
Apple Service Diagnostic (ASD) software is/was only distributed to service providers for repair and maintenance of apple machines. So it's not really a public software... Obviously it's possible to obtain it in a certain way.. though it is really hard!
Moreover one has to use the appropriate disk for his own system.
Here a (brief)list concerning G4 and G5 machines:

Dual Boot 2.1.5 (2003)
PowerBook G4 (12-inch), PowerBook G4 (17-inch), iMac (17-inch 1GHz), Power Mac G4 (FW 800), Xserve (slot load), eMac (ATI Graphics), and Power Mac G4 (Mirrored Drive Doors 2003), iMac (USB 2.0), PowerBook G4 (15-inch FW800), PowerBook G4 (17-inch 1.33GHz) and PowerBook G4 (12-inch DVD)

ASD 2.5.7
PowerBook G4 (17-inch 1.5GHz), PowerBook G4 (17-inch 1.67GHz), PowerBook G4 (15-inch 1.5/1.33GHz), PowerBook G4 (15-inch 1.67/1.5GHz), PowerBook G4 (12-inch 1.33GHz), PowerBook G4 (12-inch 1.5GHz), iBook G4 (Early 2004), iBook G4 (14-inch Early 2004), eMac (USB2.0), Power Mac G5, Power Mac G5 (June 2004 Series), Power Mac G5 (Late 2004), Power Mac G5 (Early 2005), iMac G5, iBook G4 (12-inch Late 2004), iBook G4 (14-inch Late 2004), Mac mini, and iMac G5 w/ALS (Ambient Light Sensor)

ASD Dual Boot 2.6.3
PowerBook G4 (17-inch 1.5GHz), PowerBook G4 (17-inch 1.67GHz), PowerBook G4 (15-inch 1.5/1.33GHz), PowerBook G4 (15-inch 1.67/1.5GHz), PowerBook G4 (12-inch 1.33GHz), PowerBook G4 (12-inch 1.5GHz), iBook G4 (Early 2004), iBook G4 (14-inch Early 2004), eMac (USB 2.0), Power Mac G5, Power Mac G5 (June 2004 Series), Power Mac G5 (Late 2004), Power Mac G5 (Early 2005), iMac G5, iBook G4 (12-inch Late 2004), iBook G4 (14-inch Late 2004), Mac mini, and iMac G5 w/ALS (Ambient Light Sensor

So it's not necessary to have all disks but only the one you need.

MarK,
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Is it a Pegasos I or II? G§ or G4? How did you get it supersilent? I would like to have my G4 also supersilent.

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Well, it was in a very expensive tower in it's days, and that's all the magic. My Pegasos was G4. Unfortunately, these towers aren't built anymore, and i haven't seen anything simmilar in these days.

Martin.

So this tower was full of denoising stuff? Like egg walls in a sound studio? I would like to do it in a midi tower if possible.

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I just put "Apple Service Diagnostic 2.5.7" into isohunt.com and the full 25GB set of discs and docs is the only result.