On Sep 6, 2006, at 2:44 AM, Gheorghe Ardelean wrote:

> I think the CPU will work at 33MHz. If you like to make it work at  
> 40MHz
> you have to do the "Quadra Chipping". Info about this you can find  
> here:
>
> http://lowendmac.com/chip/quadra.html

I did come across this link. Thank you though.

> On this page they say you can go with your Q650 as far as 44MHz with
> proper cooling  (by changing the original 16,67MHz oscillator with  
> a 22MHz
> version). Using higher CPU speeds give instabilities or unusable  
> serial
> ports.

It sounds interesting but I'm not sure it is worth the instability.

> The LC575 will not work at 40MHz (http://homepage.mac.com/schrier/ 
> lc575.html)

OK. Thank you for that link. It is very helpful.

> Regards,
>
> Johny.
>
> P.S. IIRC am running a 33MHz 68040 instead of an 25Mhz 68LC040  
> version.

You are saying that you are running a faster chip than was intended?  
What machine are you doing this in?

Bryan