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Saving my 2,5ghz liquid cooled PowerMac G5

T

theodor12

macrumors newbie
Original poster
Dec 2, 2020
20
2
Hi community,
so I have my old PowerMac G5 Late 2005 with 2,5 ghz dual cpu single Delphi pump laying around, but it’s broken.
It immediately overheats, which makes me suspect the pump. That LCS is just unusable for me and I am not experienced enough to bother fixing it.
So I searched on eBay and found a pair of air cooled PowerPC (probably single core) processors clocked at 1,8 ghz.

Now, here is my plan.
I thought that I could try my old cpu cards with the new air cooled heatsink. And if that heatsink wouldn’t be able to cool the two core beasts, then I would use the new 1,8 ghz cpus and their appropriate coolers.

Do you guys and girls think that one of these options could “work”?
 
I don't think it will work. The logic boards for 1.8 and 2.5 quads are quite different. The 1.8 comes from a different model G5 and I don't think the Quad's logicboard can be downclocked from 2.5 to 1.8. You can try it, but I don't think it will work. I am surprised the single pump broke on you. I thought between the dual pump and single, the single was more reliable. I have a G5 Quad with single pump in the box and not using it. I am considering getting rid of it as its useless to me - No room on my desk to it.
 
Macbookprodude said:
I don't think it will work. The logic boards for 1.8 and 2.5 quads are quite different. The 1.8 comes from a different model G5 and I don't think the Quad's logicboard can be downclocked from 2.5 to 1.8. You can try it, but I don't think it will work. I am surprised the single pump broke on you. I thought between the dual pump and single, the single was more reliable. I have a G5 Quad with single pump in the box and not using it. I am considering getting rid of it as its useless to me - No room on my desk to it.
Click to expand...
Well, I am not entirely sure that it’s broken. When I boot it, it chimes and then lasts for like 5 seconds before the “OVERTEMP” and “CHECKSTOP” LEDs turn on. When I touch the pipes, they are quite hot near the processors, but absolutely cold near their end.
 
Today, I found these CPUs. They claim to be compatible with Late 2005 G5s, which is my case.
I should rather buy these than the old ones I found, right?
 
theodor12 said:
Today, I found these CPUs. They claim to be compatible with Late 2005 G5s, which is my case.
I should rather buy these than the old ones I found, right?
Click to expand...
Which CPUs?

As far as I know, you will need late 2005 dual core CPUs. They come at 2.0, 2.3 or 2.5 ghz speed. The heatsinks from the 2.0 and 2.3 variants are too large to fit a dual processors setup (unless you do some serious modification). Theoretically, you could turn your quad 2.5 into a dual 2.0 or 2.3 (single processor / dual core) or repair the liquid cooling and make it a quad 2.0 / 2.3 (dual processors / quad core).
 
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