How far can I push an 040/25?

[Floid]

This is beyond ridiculous, but...

How about a heatpipe-heatsink that can passive-cool a P4?  :-o

[PMC]

My Apollo '040 25 has been successively overclocked for the past three years, first to 28Mhz, the 33Mhz and finally 40Mhz.

Obviously I've added a heatsink under the CPU fan, and having the whole ensemble mounted in a tower helps a lot.  Even in the UK's current record breaking heat, I'm still running reliably.

Lando, you are technically correct as older '040 CPUs were not very tolerant of overclocking.  However, more recent versions of the 25Mhz chip are reputed to be manufactured to the same tolerances as the 40Mhz version, the only difference allegedly being the part number.  If the CPU is in a ceramic case (the processor part code will read MC68040RC) then it will be better able to shed heat.  If in doubt, add a fan.  The add a bigger one :-D

[A4kT]

Off topic but...... Sonnet, the company that makes accelerators for Macs also makes the Quad Doubler
Sonnet Technologies
which uses an 040/50Mhz... This info has popped up in Amiga news groups over the years but I'm really curious to see if anyone has actually tried one of these.

Anyone ?

[jonbyk]

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?

[DeQuevedo]

Hi ppl

It´s doesn´t do nothing?

Maybe it runs at 25 Mhz by default and later, under macos, a software, sowhat way pushes it to the proper speed?

Best Regards

[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?

[jonbyk]

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

[Xand]

@jonbyk
I have a QuadDoubler(BST-50FB) in my A3640 (V3.1) in my 3000D (normal Zorro slots, no Mediator) and it works fine. Have you tried disconnecting the Mediator to see if it works?
BTW it's pretty fast. According to SysInfo it's about the same speed as my Apollo 1260.

[vortexau]

Offhand I'd say until the AC Cable becomes taunt, or until it reaches the edge of your desk surface (whichever comes first). :-)


POWER CORD FOR COMPUTER MONITOR/TOWER

computer placement exam
The computer placement exam differs from challenge exams -- students do not receive grades or academic credit for completing the computer placement exam. The results of the exam indicate how well you position your system.

Computer Comfort & Ergonomics

Computer Positioning Checklist

Positioning - Student & Computer

Office Ergonomics Training

 ° Alternately, you can leave the System case alone and just push your monitor: PC manufacturers pushing the monitor farther away from the computer

[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)

[DanDude]

I believe not worth the time, effort and money especially on repairs.  Try to find a used 060 instead.  If you do have money, get a new 060 bd.

[olegil]

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

[Dr_Righteous]

Get some crystals and a decent fan... Try it yourself. As long as you have a decent fan, you shouldn't have to worry about cooking the chip. Ramp it up untill you experience instability, then take it down till things settle. Oh, and you might wanna socket the crystal if it's not already done.

Bottom line... Some chips can take more than others, so experimentation is really the only way to find out.