Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

G5 Quad LCS Questions

SuperKerem

SuperKerem

macrumors 6502a
Original poster
Oct 29, 2012
863
260
Hi, I recently got a Power Mac G5 Quad and upon taking it apart I realised that the grey CPU cover screw/pin was not there, meaning the CPU had been opened up before, possibly for a repair.

I was wondering if anything has been modified/replaced visibly or not? This is a UK model. I, personally, don't have a clue.

The LCS has the Delphi logo on it. I thought the Delphi LCSs were the unreliable ones that were prone to failure and the Panasonic ones were newer and more reliable? If this is a Late 2005 G5, why doesn't it have the Panasonic LCS?

Also, I have heard about dual and single pump LCSs. I think this is the dual pump. Which is better? And why were there two LCS models? (is one a newer revised version??)

Thanks everyone!
 

Attachments

  • IMG_4830.JPG
    IMG_4830.JPG
    1 MB · Views: 1,717
  • IMG_4829.JPG
    IMG_4829.JPG
    1.1 MB · Views: 1,338
  • IMG_4832.JPG
    IMG_4832.JPG
    1.1 MB · Views: 460
  • IMG_4828.JPG
    IMG_4828.JPG
    1.2 MB · Views: 1,321
Last edited:
keremtezcan said:
Hi, I recently got a Power Mac G5 Quad and upon taking it apart I realised that the grey CPU cover screw/pin was not there, meaning the CPU had been opened up before, possibly for a repair.

I was wondering if anything has been modified/replaced visibly or not? This is a UK model. I, personally, don't have a clue.

The LCS has the Delphi logo on it. I thought the Delphi LCSs were the unreliable ones that were prone to failure and the Panasonic ones were newer and more reliable? If this is a Late 2005 G5, why doesn't it have the Panasonic LCS?

Also, I have heard about dual and single pump LCSs. I think this is the dual pump. Which is better? And why were there two LCS models? (is one a newer revised version??)

Thanks everyone!
Click to expand...

Don't take this as definitive, but I'm pretty sure all the quads shipped with better LCSes than the previous generation (the non dual core models). It was the dual 2.5 and dual 2.7 that were the most notorious. I use a refurbished dual 2.7 with the improved LCS.
 
Yes that looks the same as mine.
Those pipes are araldited and clamped looking as it does in the photo its is unlikely to have been touched

Mine however has been by me and it is not an easy job so I would say its original. The unit may have been removed to replace a CPU maybe?.
The grey plastic thing is called a "Click Rivet"
 
ptdebate said:
Don't take this as definitive, but I'm pretty sure all the quads shipped with better LCSes than the previous generation (the non dual core models). It was the dual 2.5 and dual 2.7 that were the most notorious. I use a refurbished dual 2.7 with the improved LCS.
Click to expand...

I know, but then why does the LCS have the Delphi logo on it? Pretty sure Panasonic made the improved LCSs. Hmm...

----------
Lammer said:
Yes that looks the same as mine.
Those pipes are araldited and clamped looking as it does in the photo its is unlikely to have been touched

Mine however has been by me and it is not an easy job so I would say its original. The unit may have been removed to replace a CPU maybe?.
The grey plastic thing is called a "Click Rivet"
Click to expand...

Strange. All the YouTube videos showing the Quad LCS have single pumps:

https://www.youtube.com/watch?v=FLTyA1iSyg8&spfreload=10
(16:50)

https://www.youtube.com/watch?v=ofKAHa2xSMY&spfreload=10
(1:25)
 
The G5 Quads never came with the panasonic lcs. The claim is Apple decided the panasonic was unreliable, and stopped using it.

They came with a single or dual pump version like you see on yours.
The dual does seem to suffer problems a bit more than the single.

Overall the G5 Quad had the least lcs problems of any G5 version, but they are 10 years old now, and problems shouldnt surprise anybody.
 
Dang... that looks scary! :eek:
Could liquid-cooled G5s be converted to air-cooled?
 
Surrat said:
The G5 Quads never came with the panasonic lcs. The claim is Apple decided the panasonic was unreliable, and stopped using it.
Click to expand...

That is correct, only Dual 2.5 and more oftenly Dual 2.7. Plastic inlet frame is different with Panasonic LCS (922-6393-Delphi, 922-6394-Panasonic).

poiihy said:
Dang... that looks scary! :eek:
Could liquid-cooled G5s be converted to air-cooled?
Click to expand...

It could but it would be much more louder.
 
bax2003 said:
That is correct, only Dual 2.5 and more oftenly Dual 2.7. Plastic inlet frame is different with Panasonic LCS (922-6393-Delphi, 922-6394-Panasonic).
Click to expand...

My dual 2.7 G5 looked nearly new when I got it, but after taking it apart, the LCS was leaking at the cpu blocks. The leak was just seepage, so no damage to anything yet. I didnt want to deal with trying to fix it and just tossed the lcs, converting the 2.7 over to air cooled using the heatsinks from a spare G5 dual 2.0. It works fine, does not overheat, and other than slightly louder fan noise, its great.
 
Surrat said:
My dual 2.7 G5 looked nearly new when I got it, but after taking it apart, the LCS was leaking at the cpu blocks. The leak was just seepage, so no damage to anything yet. I didnt want to deal with trying to fix it and just tossed the lcs, converting the 2.7 over to air cooled using the heatsinks from a spare G5 dual 2.0. It works fine, does not overheat, and other than slightly louder fan noise, its great.
Click to expand...

I would not do this with Quad Core 2.5 GHz model. 2 cores more. When you push it, even with good LCS system, fans can rev up.
 
bax2003 said:
I would not do this with Quad Core 2.5 GHz model. 2 cores more. When you push it, even with good LCS system, fans can rev up.
Click to expand...

You cant do it with the quad, I only said I did it with my dual 2.7.

The quad has different mounts, and the older dual 2.0 heatsinks will not fit. The dual core 2.0 and 2.3 are air cooled, but they are setup for only a single cpu and you would need a machine shop to modify the heatsinks to get 2 of them in there for the quad.
 
The LCS system found in the Quad is much better designed than the systems used with the 2.5/2.7 DP. Some quads shipped with the single pump but I believe later in time (2006) they started to have dual pumps where the radiator is split into two separate reservoirs.

For the trouble of air cooling a Quad there would be really no point. If this was a 2.5/2.7 it would be much easier to convert with heatsinks off a 2.0 or a 2.3 and the system would work fine. I converted one of my 2.7s to a 2.3 with the air cooled heatsinks, helped with heat quite a bit.
 
gavinstubbs09 said:
The LCS system found in the Quad is much better designed than the systems used with the 2.5/2.7 DP. Some quads shipped with the single pump but I believe later in time (2006) they started to have dual pumps where the radiator is split into two separate reservoirs.

For the trouble of air cooling a Quad there would be really no point. If this was a 2.5/2.7 it would be much easier to convert with heatsinks off a 2.0 or a 2.3 and the system would work fine. I converted one of my 2.7s to a 2.3 with the air cooled heatsinks, helped with heat quite a bit.
Click to expand...

Thanks, that's exactly what I was wondering! So the dual pumps DID come out later than the single ones...
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back