On 2017-08-14 16:51, Milt King wrote:
I have a 350 mhz Mac G4. What is the largest processor that I can place on this
motherboard. This is just a project that I am interested in.
Milt King
Oh may, this is going to be expensive!
From the top of my head, the answer is: A Dual-1.8 GHz G4, but it
depends if your motherboard has a Uni-North ASIC revision of 7 or above.
Some older original "AGP Graphics" i.e. PowerMac3,1 had a lower revision.
If it's the predecessor "PCI Graphics" i.e. PowerMac1,2: don't bother...
You would need a ZIF socket upgrade, and those are the rarest among the
rare. Also I've heard that this specific motherboard design had issues
with higher speeds, so you wouldn't want to go that route anyway. But
maybe I'm mixing this up with the first versions of the motherboard,
when it still used a G3 processor (with the same ZIF socket)...
Those would be your options (PCI Graphics only!):
http://www.everymac.com/upgrade_cards/by_system/powermac_g4.html
Anyway, from "AGP Graphics" i.e. PowerMac3,1 onward, first check the
Uni-North revision, as described here:
http://www.newertech.com/tech_support/uni-north.php
If the Uni-North revision is lower than 7, you can always use a
single-CPU upgrade. I believe there was a Single-2.0 GHz G4 CPU upgrade
also (overclocked 1.8 GHz CPU), but they are very very very rare. And
expensive too!
Also keep in mind that a fast CPU will not compensate for the general
motherboard design. The bus speed of the G4 Power Macs was at a very
slow 100 to 167 MHz. That is okay if the processor speed is equally low,
like at 350 MHz. But the faster the CPU, the more you'll realize that
the CPU will just sit there, wait for data to process but since the bus
isn't able to shift the data to the processor quickly, the fast CPU will
mostly be waiting on the bus.
BTW, I just did the research: a 350 MHz G4 is either a "PCI Graphics"
PowerMac1,2 (ZIF socket!) or a "AGP Graphics" PowerMac3,1, both from
1999 (produced and sold till 2000). All later models, like the "Gigabit
Ethernet" PowerMac3,3 from 2000, had higher CPU speeds.
So it's either this:
http://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_350.html
Or this:
http://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_350_agp.html
Anyway, for an AGP based PowerMac, those are your options:
http://www.everymac.com/upgrade_cards/by_system/powermac_g4_st.html
In general, this is what everymac.com has to say about G4 CPU upgrades:
http://www.everymac.com/systems/apple/powermac_g4/faq/power-mac-g4-how-to-upgrade-processor-zif-agp-mdd.html
Good luck!
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