Mac Mini G4 heat, noise and power consumption

[Roman78]

Well it booted on 1.92 Ghz. Only crashed while running xBench. Maybe whit a little more Power and a better CPU cooler....

A long time a go i read, that there is no Motorola Freescale 7447B CPU. That this is actually a Mobile G5. Ooohh that conspiracy....

[sonicsky]

hello I'm come from china shenzhen, I find the Power10.2 Model is different from the Power10.1 Model
The Power10.2 Model has R369 R367 R359 more, and Power10.1 Model,  Power10.2 Model Both have R351 R355 R358 R362 jmuper.
Compare the PLL config table, i guess:
    PLL3 is R351,
    PLL2 is R355,
    PLL4 is R358,
    PLL1 is R362

PLL0 is  What, and I found the Power10.1 model  is default 0 and Power10.2 Model is default 1
 

[DieHard]

The Power10.2 Model has R369 R367 R359 more, and Power10.1 Model,  Power10.2 Model Both have R351 R355 R358 R362 jmuper.
Compare the PLL config table, i guess:
    PLL3 is R351,
    PLL2 is R355,
    PLL4 is R358,
    PLL1 is R362

PLL0 is  What, and I found the Power10.1 model  is default 0 and Power10.2 Model is default 1

Yes, very confusing with 1 being open circuit, resistor removed ?

At any rate, I am guessing that the main take-way for the easiest mod for newbies would be...

Power 10.1 model: Remove all 4, PLL3 (R351), PLL2 (R355), PLL4 (R358), PLL1 (R362) and achieve 1.5 Ghz (ignore PPL0)... Like IIO said
Power 10.2 model: Remove 2, PLL2 (R355), PLL4 (R358); add PLL1 (R362), PLL3 (R351) and achieve 1.67 Ghz (ignore PPL0)

Is this correct ?

Also, those speeds should be fairly safe for CPU and thermal issues

[teroyk]

But than i noticed the CPU is a MC7447B and than HX1500QF. Does this means it is a 1.5 Ghz CPU? Could not find anything about this cpu.

From old freescale pdf (MC7447AQUAL.pdf):
"Device No./Rev.: MC7447A/B Rev. 1.1/1.1.1/1.2
Description:
MC7447A Commercial/Industrial Tier
MC7447B Node4b Commercial Tier
MC7447B Node4b Commercial Tier (RoHS)"
and four number after HX or VS means specs speed, but what means that QF, none with that in Qualification Report.
Underclockers might intrest insrustrial CPU MC7447AHX1000NB, max temperature 105C and nominal vdd 1.1V for passive cooling mac mini.
Overclockers might intrest MC7447BVS1700ZG, nominal vdd 1.32V -100/+50mV, but have to remember max temperature 85C.