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Fastest, RELIABLE used Mac G5 Quad?

I have a need for the fastest PPC (non-Intel) machine in order to run certain software under Tiger for the rest of my life (I have a short personal life expectancy, under 18 months or so). I'd need it to be noticeably faster than my current machine, of course.

There are some G5-Quad and G5-Dual machines available on eBay. I understand that some G5 Quad models are better avoided due to power supply problems, but I'm not sure which ones.

I'd be grateful for any input from the experienced forum contributors who may have any advice.

Thanks in advance.

Dual 1.25MHz MDD G4, 2GB RAM, 4 int dr.3ext FW drives, Mac OS X (10.4.11), nVidia 7800 GS 425MHz 256MB video card, dual 22" CRT monitors

Posted on Aug 2, 2011 4:09 AM

Best reply

japamac

Level 7

24,400 points

Posted on Aug 2, 2011 5:52 AM

Hi-

The Quad is the fastest PPC machine.

They didn't have any more power supply issues than other models, and are possibly one of the more reliable machines.

http://www.macintouch.com/reliability/pmg5.html

The one caution point for the Quad is the liquid cooling.

However, I haven't seen that the Quad is a prone to failure as early LCS machines (all 2.5 GHz and 2.7 GHz dual processor G5's).

If one wanted to forego the potential minefield of the LCS, a late 2005 2.3 GHz dual core would be the fastest air cooled machine.

Geekbench CPU and Memory Benchmark:

Power Mac G5 (Late 2005)
PowerPC G5 (970MP) 2.5 GHz (4 cores)

3318

Power Mac G5 (June 2004)
PowerPC G5 (970FX) 2.7 GHz (2 cores)

2259

Power Mac G5 (June 2004)
PowerPC G5 (970FX) 2.5 GHz (2 cores)

2100

Power Mac G5 (Late 2005)
PowerPC G5 (970MP) 2.3 GHz (2 cores)

2084

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65 replies

Sep 4, 2011 1:53 AM in response to romko23

This is what you can expect to see reported in a single-pump G5 Quad, like mine. 😝

romko23 wrote:

but I called a friend tonite and he told me the single pump reports the same way as the dual.. here are my temps to show you..

CPU A Core 1 Diode: 106.1 F

CPU A Core 2 Diode 104.6 F

CPU B Core 1 Diode 107.9 F

CPU B Core 2 Diode 117.1 F

So what? What do you think those temperature readings are supposed to show relative to the issue of single versus dual pump, Romko? Nothing! Absoluely NOTHING!

romko23 wrote:

…I am not sure where Ramon is getting his info from…

From the horse's mouth, Romko. From the highly qualified and skilled engineers, technicians and programmers who develop this tech software at Dr. Marcel Bresnik's:

http://www.bresink.com/index-en.html

With all the respect that I can muster, I must tell you that now I'm even less inclined to trust what you've been told about the need for keeping the rivets. 😀

romko23

Level 2

408 points

Sep 4, 2011 12:02 PM in response to Ramón G Castañeda

You don't have to be SO NASTY... Anyway, I don't have hardware monitor.. I use temperature monitor.. Is there another software out there(FREE I HOPE) that will tell me this stuff other than hardware monitor?

Sep 4, 2011 4:51 PM in response to romko23

Since it appears that the good mods have seen fit to clean up the last few posts in the interest of civility, I'll repeat this solution for the benefit of Romko and future readers:

romko23 wrote:

…I don't have hardware monitor.. I use temperature monitor.. Is there another software out there(FREE I HOPE) that will tell me this stuff other than hardware monitor?

Download Hardware Monitor from the above linked site. The free demo version will indicate to you what additional sensors are available for your machine once you unlock (buy) the application. That will tell you if your machine has one or two pump sensors.

Sep 4, 2011 4:52 PM in response to Ramón G Castañeda

EDITED last post: "good moods" to good mods. 😊

Sep 4, 2011 7:58 PM in response to Ramón G Castañeda

Ramón G Castañeda wrote:

Since it appears that the good mods have seen fit to clean up the last few posts in the interest of civility…

I'l also repost the following:

https://discussions.apple.com/thread/1338754

Jan 13, 2008 6:59 AM

Hi to you all. I just bought a well-loved G5 2,5 Quad and now i'm wating for delivering. I've read several posts about G5's coolant leaks but I'd like to know little more about these two different types:

http://www.mac-resource.com/parts/661-3729.gif

Can someone tell me if the dual pump model is the more safe and reliable, or the one is worth the other? According to the posts and forums I've found on the net, it seems the single pump one is the most affected by coolant leaks.
Thank you
Rob

The emphasized text in red is just to show the great degree of confusion around this issue. No one seems to be sure, and no one has posted definitively labeled images of the pumps side by side that i have been able to locate. It loks like moot point to me.

Fastest, RELIABLE used Mac G5 Quad?