>In a message dated 7/16/01 7:02:39 PM, [EMAIL PROTECTED] writes:
>
><<
>... (Don't even ask how many desktop Macs this
>has involved.) All I'm going to use the 520/540c is
>for text production and *maybe* email (with an
>external modem). It needs to be over-clocked about as
>much as it needs to be painted candy apple red ...
>>>
>
>The supplied heat sink is designed for 33/66 MHz, maximum.
>
>The 5xx series is cooled by conduction, by a heatsink of limited size, which
>cannot be extended due to the constraints of the card cage.
>
>"Chipping" beyond the design limit doesn't make much sense unless you can get
>the extra heat out.
Getting the extra heat out insures (OK, almost insures) your ability
to overclock. Lack of extra cooling doesnt prevent you from
overclocking though. It really depends on the individual CPUs. I
had a Centris 650 with a 25 MHz 68040 that overclocked to 38 MHz for
a long time (until I added a PPC card) with only the standard
heatsink.
You can improve on Apples heatsinks with usually no problem. I plan
on overclocking a 500 module soon, and I wil lexperiment on making a
better heatsink.
Mad Dog
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