[Kozmik]

I, soon, will overclock my beloved Quadra 630. The only things I've ever read about OCing a 630 is that it will only go to 40MHz. Is this true? That something just stops the 68040 at 40MHz? Or is that just the maximum speed it's been known to be stable at? I'd like to know how fast I can go with the thing, keep it stable, and not need to store it in a walk-in freezer to cool it.

[wlonh]

"Quadra 630 uses a Clock Generator. This clock generator is located at position U20 on the motherboard. Depending on the surface mount resistors used, this part will either put out a signal for 25, 33, or 40MHz operation."

so, the limitation seems to be the clock generator itself, but that does not mean that even with a clock generator that will 'put out' a faster signal that the chip could be clocked higher... and i don't know

got the above info here: http://violet.berkeley.edu/~schrier/q630.html

[This message has been edited by wlonh (edited 06-01-2000).]

[Kozmik]

Hmm... ok, then I guess I'll be stuck at 40MHz. Not bad, considering I'll be running OpenBSD on it anyway. On second thought, no one knows where to get the only PowerPC PDS upgrade card for the Quadra 630, right?

[wlonh]

well no i don't know that either, maybe someone does...

BUT have you checked the lowendmac site on the 630? http://www.lowendmac.com/quadra/q630.shtml

maybe one of the quadra 'clubs' would know where to get, etc.

[Kozmik]

Thanks for the help. If only I had the courage to overclock my iMac DV SE...

[wlonh]

oh i just remembered... try sun remarketing, macresq, and shreve systems, they may have that old accelerator upgrade

and maybe ebay

[Kozmik]

Hey, has anyone here actually undertaken such a project? Removing the resistors requires two irons because they need to be lifted off from both sides. Has anyone here done this? Is it a major pain in the @$$ to do?

I've done that mod, it was a pain. I used 1 iron and a pair of real thin needle-nosed pliers to remove the old resistors. It was a tad easyer than clocking my sawtooth G4.