PPC 604E processors

[Framiga]

IIRC the max multiplier is 4.5 in a CSPPC. With a 66.666 Mhz, you'll achieve about that.

Will it works? try and let we know! :-D (with a huge cooling system, of course)

[Framiga]

yes ok Lunarnut but pentiums were a different things.

Here in Amigaland the biggest problem would be the ram controller buswidht (and probably the project/routing itself also).

Someone tryed to install a 300 Mhz 604e, with problems about stability. Now we don't know if these issues were generated by a suboptimal BGA soldering or else.

Look at this page, where this guy tryed about everything to achieve the better performance/stability ratio. (look also at the temperature achieved)

DaveM overclocking page

[Framiga]

Homer wrote:
Hmm, but would the 300Mhz cpu work at 233Mhz   :-?

yes of course :-)

[Framiga]

AJCopland wrote:

Homer wrote:
Hmm, but would the 300Mhz cpu work at 233Mhz   :-?

Yes it would. The question being asked is, could you remove the 233MHz 604e CPU and solder in place a 300Mhz 604e CPU.

The answers are both yes, but the 300MHz cpu would only be running at 233MHz because the crystal which generates the clock frequency at which the CPU runs is only running at a speed AND multiplier that produces a 233MHz speed.

For this to work as the original poster wished they would have to replace the CPU with the 300MHZ _capable_ one, and then change the crystal and onboard multiplier to generate a 300Mhz cpu clock.

Andy

nope, the multiplier goes to 5x (look at that page)

[Framiga]

ops sorry! i've overlooked one. Apology! :-)

[Framiga]

ah ok, if you find someone who can do BGA reworking/reballing then yes, no problems.

edit- IMHO the worse problem, seems to be reworking an already populated PCB (very populated in the CSPPC) and then sometimes the fault is not the CPU itself but some broken traces in some internal layer.

A guy here in Italy, tryed to send the CSPPC to an italian BGA specialist (he fixed/X-rayed some traces also).

[Framiga]

to cool down the RAM controller chip, that goes very hot sometimes.