Overclocking 3640 board

[HyAmi]

http://members.iinet.net.au/~davem2/overclock/a3640.html

Apparently, it involves soldering a wire between 2 components and also a new oscillator/socket for it.

I've performed this hack, and I must say it works perfect for me. Just to be sure, I swapped the 25MHz 040 for a 33MHz and put an active cooler on it. And while I was at it, I also replaced the capacitors.

So if you want to go for a little hack... this one's recommended.

[HyAmi]

I read that you might get motherboard timing issues. and that a trace on the mb has to  be cut?

Aren't you mixing up with the infamous INT-2 hack on the A3000? Anyway, I used the upgraded A3640 without problems in my A4000T. At this moment there's only one Zorro expansion card (Elbox FastATA) and it has no problems.

[HyAmi]

if i was going to do this project i will use a 68040v ( 3.3v ) to reduce heat.

I think that's not feasible. The complete circuitry of the A3640 was probably build for 5V only. My guess is (but I'm not an expert) that you'd have to build a voltage regulator for many pins on the processor, both power and data.

On the other hand; please surprise us with a nice project to prove me being wrong!

[HyAmi]

No.  Check here: http://members.iinet.net.au/~davem2/overclock/a3640.html

i was at the overclocking workshop Dave refers to above, and yes we had issues with overclocking above 28 mhz, and he did cut some tracks on the MB.

It was may be 8-10 years ago though so i'm a bit hazy on the details.

Actually, that cut-track-thing of the delay line (as mentioned on that page) is not on the mainboard but on A3640 itself. So if someone had cut tracks on the mainboard, he did another hack/overclock than this one.