How far can I push an 040/25?

[olegil]

Lando wrote:
Not a chance of hitting 40Mhz - thats like 70% overclock, and 040 if very hot even at normal speed.  30 is good, 33 if you're lucky.

I've had mine at 40MHz for years. It's 60% for those of us who know their math.

I even use passive cooling.

[olegil]

zipper wrote:
Did they use 40 MHz chips in Sonnett Doubler 50 MHz Peltier cooled accelerator cards?

No, they used 25MHz ones.

[olegil]

jonbyk wrote:
I recently bought a Quaddoubler 100/50MHZ.
I Put it into the 040/6340 board on my A3000
Mediator setup.  It tried to boot up, but couldn't.  Any suggestions?

There's no reason why it shouldn't work. Found this with Google:
http://www.bison21.bizland.com/QuadDoubler.html

What excactly happens when you power on?

[olegil]

@vortexau:

Doh, good point :-)

[olegil]

jonbyk wrote:
When I power on, my hard drive makes sounds like it is booting up.  Then it keeps on doing the same thing till I turn it off.

It seems to be trying its best! It fans itself nicely and stays cool.

Are there any switches that need to be changed?

Thanks

Shouldn't need any jumper settings or anything. But a quick sanity check. Are you replacing a 25MHz 68040 with a 50MHz quaddoubler, or what? I don't think the quaddoubler has its own clock, it only has a pll that can double the one on the motherboard. So that one has to be 25MHz.

Other than that, I can't think of anything that should make this not work. It's an extremely simple piece of equipment (clock doubler and CPU with cooling)

[olegil]

Bah, a Motorola can take almost anything. If they overheat, just cool down and try again :-)