Ask :
It's not often easy to clean these G5 Beasts, but have you access to a high pressure air compressor? I use 100PSI to clean most areas.Answer :
I've often wondered if the amount of RAM sticks affected the Memory Controller temp much, I have all but 2 slots filled with 10GB, my temps stay about 57°C, I think the 66-67°C on yours is going to aggravate the lead-free solder issue around the slots & controller.
I have a 2.7. and had the same problem with noisy fans. There are lots of 'fixes', none of which worked for me. Removing the LCS can be a bit daunting but is not too hard. I changed the thermal paste and the unit had no leaks, I did not change the coolant but will do that next time.
To stop the racket I removed the two front input fans and replaced them with ultra quiet after market fans. I wired them a PC fan controler card which powers and regulates the noise/speed of the fans. I am about to do the same with the rear fans, this stops the 'ramping' of the fans. There are reports of 'ramping' G5 fans as far back as 2005, my thoughts are that the sensors which control the fans are too sensitive and even when users have had new logic boards, the problem often returns.
Bottom line, the early attempts at liquid cooling and fan control where not really very good, but as my mac only cost about 120 dollars I don't mind chopping it up and adding PC fans and to be honest it's a fun project to try to get all the Apple fans out and high quality silent fans in. Hope this was helpfull in some way.
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