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Updated G5 Developer Note available
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Admin Emeritus  Join Date: Oct 1999
Location: Zurich, Switzerland
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G5 Hardware Developer Note
Some highlights:
Liquid Cooling System
The 2.5 GHz configuration of the Power Mac G5 uses a liquid cooling system controlled by Mac OS X to manage the temperature of the processors in the computer. The liquid cooling system works in conjunction with the air cooling system and is designed to to optimally cool internal components as quietly as possible. The liquid cooling system is sealed and is not designed to be opened.
Warning
Do not attempt to open or service the liquid cooling system. Opening the liquid cooling system may damage your equipment, and such damage may not be covered by the limited warranty on your computer.
If the [fan control unit] does not receive an update from the operating system within two minutes, it begins to ramp up the speed of the fans to full speed.
If the Power Mac G5 computer detects a processor temperature that is high, due to high ambient temperatures or other factors, it will automatically enter bus slewing mode regardless of the selected setting.
tooki
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Clinically Insane
Join Date: Dec 1999
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it will automatically enter bus slewing mode
If it gets too hot, it goes into psycho mode and kills everything.
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"…I contend that we are both atheists. I just believe in one fewer god than
you do. When you understand why you dismiss all the other possible gods,
you will understand why I dismiss yours." - Stephen F. Roberts
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Junior Member
Join Date: Apr 2002
Location: Detroit Michigan
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its kinda obvious. Apple would rather have people bitch about the decreased performance when in a very very warm environment, than risk replacing a system because a customer fryed their cpus. I totally agree with the document. I have a client that had a dual 2.0 with the vents on the backside pointed towards teh wall. The room was totally enclosed from the outside without any sort of cooling. I was called out to see why their new "server" would not work properly. The room was an oven, and caused the G5 to fry. it was a sad sad day.
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Mac Elite
Join Date: Oct 2002
Location: 33-37-22.350N / 111-54-37.920W
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Anyone have photo's of this "cooling" system, or just diagrams?
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Mac Pro 3.0, ATI 5770 1GB VRAM, 10GB, 2xVelociraptor boot RAID, 4.5TB RAID0 storage, 30" & 20" Apple displays.
2 x Macbook Pro's 17" 3.06 4 GB RAM, 256GB Solid State drives
iMac 17" Core Duo 1GB RAM, & 2 iPhones 8GB, and a Nano in a pear tree!
Apple user since 1981
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Admin Emeritus Join Date: Oct 1999
Location: Zurich, Switzerland
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Did it just slow down, or did it actually damage the hardware?
tooki
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Junior Member
Join Date: Apr 2002
Location: Detroit Michigan
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it damaged the hardware. its fans were overworked and air just heated up, since it couldnt escape the room. Eventually it got too hot.
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Professional Poster
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Originally posted by metfoo:
it damaged the hardware. its fans were overworked and air just heated up, since it couldnt escape the room. Eventually it got too hot.
Every single home electronic device always mentions that you should leave proper ventilation for the unit.
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"Laugh it up, fuzz ball!"
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Mac Elite
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stuffing feathers up your b*tt doesn't make you a chicken.
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Professional Poster
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Mac Elite
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Nice !!! The for the links ! 
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stuffing feathers up your b*tt doesn't make you a chicken.
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Mac Elite
Join Date: Oct 2002
Location: 33-37-22.350N / 111-54-37.920W
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So those are actual photo's of the dual 2.5?? cool..
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Mac Pro 3.0, ATI 5770 1GB VRAM, 10GB, 2xVelociraptor boot RAID, 4.5TB RAID0 storage, 30" & 20" Apple displays.
2 x Macbook Pro's 17" 3.06 4 GB RAM, 256GB Solid State drives
iMac 17" Core Duo 1GB RAM, & 2 iPhones 8GB, and a Nano in a pear tree!
Apple user since 1981
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