I bought a full '040 for my Centris 610 from www.orb.com
This company has old NeXT parts, etc.  I think I paid around $40 or so.

- Lynn

> -----Original Message-----
> From: port-mac68k-owner@netbsd.org
> [mailto:port-mac68k-owner@netbsd.org]On Behalf Of Steve Revilak
> Sent: Tuesday, February 09, 1999 5:40 AM
> To: port-mac68k mailing list; ulrich.hausmann@a2e.hp.shuttle.de
> Subject: Re: re: full 68040 processor
>
>
> uh1021 <ulrich.hausmann@a2e.hp.shuttle.de> writres:
>
> >Does anyone know here by chance
> >
> >a) where to get full 68040 processors for cheap
>
> The best sources for cheap '040's are generally vendors that do repairs or
> deal in used/refurbished equipment.  I would suggest picking up a computer
> margazine -- look through the classifieds.  Make calls.  Send E-mails.
>
> Perhaps I should qualify my repsonse.  I've found that to be the case in
> the US, but I see you're in Germany.
>
> >b) whether or not a 33 Mhz processor would also work in a 25 Mhz machine
> >(like C 610 or Q 605 or LC 475)?
>
> Yes.  But you'll need to chip the machine up to 33 mhz.  Otherwise it will
> continue to run at 25.
>
>
> >c) if a 25 Mhz processor in 33 Mhz machine would break because
> >overclocked?
>
> I talked with a number of vendors when I took this plunge a few years.  I
> have a Q605, with FPU, chipped to 33 mHz.  They all said the same things:
>
> From what I understand, the LC040 chips really don't care. You can
> overclock a 68LC040 and it 'will usually do just fine'.
>
> For the full 040's  (w/ FPU) this is NOT true.  Vendor consensus -- Trying
> to overclock the FPU tends to make the chips 'extremely unstable'.  (I
> don't like the sound of that).  However, the FPU's don't mind being
> underclocked.
>
> Say your get a 33 mHz 68RC040 (that's the model number for the
> one with the
> FPU).  If should be fine whether run at 25 mHz or 33 mHz.  I ran my 33 mHz
> chip at 25 mhz for about a month before getting the clock chipper -- no
> problems.
>
> However, in the case of a 25 mHz 68RC040, you're stuck at 25 mHz.  Trying
> to nudge it up to 33 will most likely make both you and the machine very
> unhappy.
>
> Good luck.
>
> Steve Revilak
> revilak@umbsky.cc.umb.edu
>
>