Re: iMac upgradability

[tonywong@_no_spam_compusmart.ab.ca (Tony Wong)]

In article <tkeenan1-1111980848310001@frd-md1-14.ix.netcom.com>,
tkeenan1@N0SPAMix.netcom.com (Tom Keenan) wrote:

>In article <36496ddd.0@pink.one.net.au>, "D Horwood"
><dchorwood@one.net.au> wrote:
>
>> Randy Carr wrote in message ...
>> 
>> >Do you know that you can get the iMac/A to run at 300MHz.
>> >You have to configure some resisters, people are doing it with know
>> trouble.
>> >I have not, but I may in the future.
>> 
>> 
>> How ? Please let us all in . I'd love to show my Wintel friends what my
>> "toy" can do compared to their Turbo-charged Dinosaurs..
>> 
>> 
>> Des Horwood      dchorwood@one.net.au
>
>
>Wouldn't the overclocking generate additional HEAT?
>Could that be a problem in a little box with an integrated monitor like
>the iMac's, which I assume is engineered for specific cooling
>requirements?  Wouldn't it take a while before any trouble became
>apparent?
>
>- Tom

According to IBM, here are the heat dissapation specs for the PPC 750 series:
Note that this is the newest design(s) [there are two designs, one below
300MHz, and one above] , and Motorola parts may be slightly different. As
well, the heat differences here do not take into account L2 cache power
increases due to overclocking.

Power Dissipation
Typ./Max.(est)
5.6/8.8W@ 233 MHz
6.5/9.8W@ 266 MHz
6.7/10.1W@ 275 MHz
7.3/11.0W@ 300 MHz
3.8/5.0W@ 350 MHz
3.9/5.2W@ 366 MHz
3.7/4.7W@ 333 MHz

As you can see, 2 to 4 W doesn't really impact your system, but make sure
you have adequate cooling to the processor. Just keep in mind that
configuring resistors in this case requires soldering which will VOID your
warranty. Good luck with the overclock!

Tony
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