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 ]

Quote:

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

Quote:

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

Quote:
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.

I just finished testing and upgrading my Pegasos 1.8 GHz:
BackdropPegas.jpg
MorphOS reports L2=256 KB, but in real cache is 512 KB - see ramsmp output.

AmigaOS reports L2 correctly: AmigaOS-1.8GHz.jpg

Anyway this super machine received Radeon 9800 PRO and SATA controller.
It is now my main MorphOS computer until Mirari will came. ( Powermac G5 Quad is too loud )

This makes me wish that there were a Pegasos III.
Freescale MPC7448 @ 2.0 Ghz with 200 Mhz bus
DDR2 RAM? (though the last PowerBook had to run it at a slower 333 Mhz clock)
I guess because it already has FireWire400, throw in FireWire800 as well.
If paired with Freescale's MPC8641 processor, you could get a 667 Mhz bus, dual 64-bit memory controllers, PCIe graphics capabilities, and SATA drives. ~17 years ago, this would have been killer.

> This makes me wish that there were a Pegasos III.
> Freescale MPC7448 @ 2.0 Ghz with 200 Mhz bus

This spec (almost, as 2.0 GHz would have been overclocked) was termed "Pegasos 2.5" back then by Genesi :-) It was (to be) essentially a Freescale HPC II ("Taiga") with Genesi OpenFirmware.
Btw, as Genesi was listing its High Density Blade (HDB) with up to dual-MPC7448 and Tsi109 as an available product at least from early 2006 to early 2007 (and as a discontinued product since then), has anybody ever seen this board (photo or own eyes)?

> paired with Freescale's MPC8641 processor

This was announced as the Pegasos 8641D by Genesi :-)
Unfortunately, this didn't come to fruition, and neither the Efika 8610 nor the OSW/TetraPower (while the latter became the PowerStations's Bimini board, so in a way the TerraSoft/Fixstars PowerStation with PPC970MP and CPC945 is the closest to a Pegasos III that came to be).


Edit: Changed some links for more information

[ Edited by Andreas_Wolf 14.10.2025 - 10:28 ]

Yes, it could be nice machines.
Pegasos 8641D: 02-Pegasos-8641D.jpg
Pegasos III alias TetraPower: 03-Pegasos-III-Tetra970MP.jpg

In any case, I have one "new" 7448 CPU, for Powerbook G4 of for other Pegasos 2
Unfortunately, there is no computer with 200 MHz bus.

Here is part one of my article about Pegasos 2-HP 1.8 GHz. CPU swap, memory and other upgrade.
Again, at first in Czech language, need google translate.

There will be second part with benchmarks against Pegasos 1.33 GHz and Mac Mini 1.8 GHz. English version will be published on intuitionbase.com when I will have time to translate. It means more later than sooner

> Here is part one of my article about Pegasos 2-HP 1.8 GHz.
>
> "MPC7447A: [...] jsou taktovány do 1420 MHz [...]
> MPC7447B: taktovány do 1667 MHz."

Both MPC7447A and MPC7447B were rated up to 1.7 GHz. Again the respective part numbers as documented by Freescale/NXP:

MC7447AHX1700PC
MC7447BVS1700WG
MC7447BVS1700ZG

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=13470&start=33

@Andreas_Wolf

>MC7447AHX1700PC
>MC7447BVS1700WG
>MC7447BVS1700ZG

these are values from Freescale Qualification report. You can use this document to check electrical and thermal values, but it said nothing about serial production.

I never see full product Hardware specification sheet and never see this processors inside real computers or on market.

If you have this, please post here the source. Otherwise this information has very limited practical use.