To free the CPU cards you must remove ten black positioning bolts and four sprung retaining bolts from each half of the LCS assembly.ĭo not remove the centremost black bolt on the copper heat spreader unless you also wish to remove the heatsink from the card. Don't be afraid to take notes and photos. Pay attention to how things come apart so you can better understand how to put them back together later. Please follow the official Apple Service Source guide to removing the CPU assembly. Lots of tins/boxes/baggies to keep your screws and parts separate in.
Two clean syringe bottles (I prefer the n-neck style). EKWB hose cutting tool, any with a sharp blade will do. T10 hex bit or equivalent size Allen-key (one is included with the Eisdecke). 4mm ballhead hex bit (you can use a flathead but be careful). A multi-bit screwdriver with a very long spindle (my solution pictured above). Apple Service Diagnostics 2.6.3 boot CD. Your preferred thermal compound (I used Noctua NTH4 because it's what I had to hand). 1 litre XSPC EC6 coolant (I chose red to make any leaks extra easy to see, beside the fact that it looks brilliant). 3/8" Inner-Diameter 1/2" Outer-Diameter acrylic tubing (buy a metre or more to facilitate fiddling and potential errors). Alphacool Eisdecke DDC V.4 Acrylic Top ( x 2 ). Apple PowerMac G5 Quad rev.2 "dual-pump Delphi". This guide is written under the assumption that your Quad is currently working as it should. My procedure involves draining all the GM Dexcool and flushing the LCS with distilled water before refilling it with conventional PC coolant. As a result it was unlikely that this Liquid Cooling System (LCS going forward) would ever leak, instead it was the coolant inside the system that was a concern. The Mac pictured was one of the very last Quads built - the 531st unit built in week 50 of 2005. You can still fit the acrylic air baffle in the machine but it sits under pressure, which I'm not a huge fan of. The chosen pump tops are a near-perfect fit for the G5's case, but require the removal of the G5 faceplate. This facilitates far easier draining and refilling of the system and should ostensibly improve the longevity of these machines by reducing the risk of pump failure. 
In short, my mod involves removing the original DDC pump tops and replacing them with third-party blocks with multiple ports. I will do my best to be thorough in my descriptions. Sadly I do not have pictures of my process in this version of the guide but I will be repeating this mod on another machine at some point in the next year or so in order to document the process properly and make a better-illustrated guide. Hi all, this is a guide to my personal modifications to the Apple PowerMac G5 Quad rev.2 "dual-pump Delphi", pictured above.
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