I successfuly exchange 1 GHz CPU on my second Pegasos 2 to this one:
MC7447B 1667 MHz ( from ebay / 10,- USD )

Just now it is overclocked to 1800 MHz and I start testing...
Peg2-1800MHz.jpg

And I have question:

if CPU clocked to default 1667 MHz, SmartFirmware shows cpu0: PowerPC,7447A CPUClock 3428 Mhz
if CPU clocked to 1800 MHz, SmartFirmware shows cpu0: PowerPC,7447A CPUClock 1799 Mhz
Why Smart firmware ( and OS too ) shows double value for 1667 and are there way howto fix it?

P.S. in meantime when I waiting for Mirari, I has to upgrade a little bit my pets.


[ Edited by sailor 09.09.2025 - 16:15 ]

I would just be silent about the wrong display and show everybody "look, I have the fastest G4 in the world in a 3.4GHz Peg II!"

I have no idea how SmartFirmware calculates, though.

Congrats on that catch, let us know if it runs stable in the long run. I wonder if it's worth the risk. Mine is still at 1.0GHz. It would hurt if I broke not just a 10 EUR CPU but maybe also the CPU module or even the mainboard.

[ Edited by Sprocki 09.09.2025 - 17:32 ]

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At least the OS part is easy to answer. MorphOS HAL just picks up what it gets from OpenFirmware.

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It's worth the risk, but only if you have someone experienced who really knows how to replace a BGA CPU.
Second issue is VCore voltage, it should be suitable to new CPU. And everything all is easy

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Thanks. Probably I should edit nvramrc script. I have no experience with this. On the other way I could set here displayed frequency value to something like 5.5 GHz and make some cool screenshots with AMD-fast G4

> I successfuly exchange 1 GHz CPU on my second Pegasos 2
> to this one: MC7447B 1667 MHz […]
> Just now it is overclocked to 1800 MHz and I start testing...

Congratulations. I don't think anyone managed to run a Pegasos II beyond 1.4 GHz 7447A (#10) before.

Congrats!
I suppose it's something like this.