@amigadave

In my honest opinion it is best to just use a single 1.25ghz card and overclock it to 1.5ghz. It is outperforming my 1.75ghz Mac Mini by a good margin for whatever reason. Games like to hiccup on the Mac Mini whereas my Mac MDD runs just great and uses much less CPU usage when I use emulators. Also, temperatures drop drastically with a single core cpu even using an aluminum heatsink. (though I have 3 MDD macs and several CPU cards and two spare logic boards.)

> It is outperforming my 1.75ghz Mac Mini by a good margin for whatever reason.

I think the reason is the L3 cache as you already suspected in other threads:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=9084&forum=38&start=7
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=9265&forum=3&start=9

> temperatures drop drastically with a single core cpu

This is solely about single-core CPUs anyway, even when using a dual-CPU module ;-)

I been out of the loop for awhile so thanks for the links. :)

Isnt the CPU in the mac mini the same one that is used on a single cpu 1.25ghz in terms of caches?

Did some searching and the Mac Mini G4 uses a 7447a cpu, and the MDD macs use the 7455 cpu. The L3 cache is only 1MB on the single cpu 1.25GHz, but it is cheap enough of a card to overclock to 1.5GHz.

Just upgraded to 1.25GHz myself, had to desolder resistor R676 on the (133MHz FSB) logic board but everything went well. What's needed to go to 1.42GHz?

> Isnt the CPU in the mac mini the same one that is used on a single cpu 1.25ghz
> in terms of caches?

You are probably aware by now, but just in case:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7419&forum=11&start=4
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7791&forum=11&start=20
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=8201&forum=3&start=15

Thanks Andreas_Wolf. :)