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tviolation

macrumors newbie
Original poster
Jul 15, 2000
7
7
I picked up five Power Mac G5s locally yesterday from FB Marketplace, with the intention of cleaning them up and moving them along to other vintage Mac enthusiasts and keeping one for myself. All of them boot, which is great and better than I expected. I do a lot of tinkering and upgrading with G4 Macs, but I haven't worked on or had a G5 since they were still current models. As such, I haven't really paid a whole lot of attention to the details and quirks of upgrading individual models over the years. Anyways, I'm hoping that more G5-savvy folks here might have a thought on something.

One of the Macs is an early 2005 dual processor 2GHz model which has been somewhat abused. Someone clearly started to strip it at some point and, although I have all of the fans for it, the plastic brackets that hold them in place and some of the fan power connectors are missing. I swapped those parts in from another machine to test it and it does boot. Unfortunately, this particular model is limited to 4GB of RAM due to only having 4 DIMM slots on the logic board. But I see that it has the through-board solder holes and even the markings for the other slots on the board which leads me to wonder if it could be as simple as soldering additional memory slots to the board and overcoming this limitation. I know there have been other, much older, Macs where this was sometimes the case, but has anyone ever tried this on a G5?

Of course, I know that this is a lot of work and not the most practical thing to do. But, given the condition of this particular machine, it isn't one that I am going to easily re-home and, with the RAM limitation overcome, would be a fun project machine for me to mess around with. The needed soldering is well within my skillset and I can find the sockets, but I'm not sure if there are other differences between the logic boards that I'm not considering. Thanks for any thoughts you might have!
 
For some models, yes. The 2.3 and 2.7GHz versions of this particular model could take 8GB while the final (Late 2005) G5s could max at 16GB. But the dual 2.0GHz (Early 2005) model is limited to 4GB.
 
There’s not a whole lot you can do with a PPC Mac that needs more than 4GB. I’ve got 16 in my late 05 2.3 DC, it never uses more than 4 or 5 GB, even with a RAM disk. I’d say put your efforts into the restoration and not worry about the RAM capacity.
 
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Mactracker says the early 2005 G5 models are limited to 4 GB. If it were the 2.3 GHz, then its limit is 8 GB.
 
I do not think soldering in the extra slots will do anything without firmware modifications that are basically impossible to accomplish. If it is set up the same way as my 04 DP 1.8ghz with 4 ram slots the 4 unsoldered slots do not show up in system profiler. It only shows the 4 soldered ones so apple must have modified the firmware.
 
There’s not a whole lot you can do with a PPC Mac that needs more than 4GB. I’ve got 16 in my late 05 2.3 DC, it never uses more than 4 or 5 GB, even with a RAM disk. I’d say put your efforts into the restoration and not worry about the RAM capacity.
Thanks for the input on that. It's actually really helpful.. I don't have a good frame of reference... all of my other PowerPC Macs that run OS X are G3 or G4 machines that are maxed out between 1GB and 2GB of RAM. The last time I actually used a G5 was probably around 2006, and that one was upgraded to 2GB if I recall. I actually imagine that I'll be using this one for a lot less intensive stuff now than what I was doing back then anyways, since it's now just a toy rather than the computer I use for everything.
I do not think soldering in the extra slots will do anything without firmware modifications that are basically impossible to accomplish. If it is set up the same way as my 04 DP 1.8ghz with 4 ram slots the 4 unsoldered slots do not show up in system profiler. It only shows the 4 soldered ones so apple must have modified the firmware.
That's a great point, and something I hadn't thought to look at. I remember there being some 68k and earlier PowerPC Macs where Apple had simply left them off on the board for marketing purposes, and they could be put on later and work, which is why it crossed my mind in the first place. Once I get it pieced back together enough to boot it up fully, I'll check System Profiler, but I'll bet you're right and that it is set up the same as yours. Thanks!
 
I have this PCI dual 2ghz cpu a1047 and it is a stout powermac despite only having max 4gbs DDR. Throw a SSD in there and you'll be humming along. Even running InterwebPPC browser, MS word, CS4, garageband, Itunes and zipeg while watching a YT vid in tenfivetube, I'm only using 47% of the 4gb in this machine.Snapshot shows 44% but the average was between 46-47%. 4gb is plenty for most DD tasks we can throw at it.
PMG5 A1047 RAM.jpg
 
I will have to try InterwebPPC on my G5.
Not had it on since I bought my Mac Pro in 2010.....🤪
It was left at last version of Leopard, so should be good.

I assume there are the same issues with modern WiFi Broadband as on G4 PPC.
If so I will connect by Ethernet.

I may possibly just connect to my intel mp with Ethernet and use screen sharing.
 
Interweb is great and is my preferred PowerPC browser. With that being said, when I restored to a Sorbet Leopard image and compared them, the updated webkit build included in Sorbet did beat out Interweb in speed. The difference was just a few seconds but it was faster. I use stock airport extreme on this a1047 with a homemade antenna which is connecting at 54mbits to my legacy wireless b/g 2.4 band network so nothing at all fancy or terribly fast. Works AOK for this box.
 
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