I have a 68060 and no accelerator!

[A3KOne]

The a3640 has no local ram and suffers seriously due to it.
Changing the voltage on the processor is also not easy.  Better to get a board designed for 060 use.

if you have a rev 3.1 board, you can "safely" clock it up to ~ 33Mhz (be sure to add cooling)... this really needs to be done to the board anyway.  The whole idea of a 25Mhz accelerator with no local ram is bad... they don't sync properly with the motherboard ram unless over 28Mhz.  Clocking it up to 33 makes a huge difference.

melott wrote:
Hmm.....

This brings up a question I hadn't thought
of before...
I have an A3640 card. I have an A3000/25.
The 040 chip on the card doesn't do much
for my A3k/25.
But what if I hacked an 060 chip and a faster
regulator on the card.
As I said, the card works but there is very
little difference between an 030 and an 040
at 25mhz. It would be something I would try
if it will work.
Any ideas??

Mel Ott

[A3KOne]

try this link for overclocking the A3640.

A3640 Overclock

The difference between the overclocked 3640 and the factory 3640 is greater than the factory A3000/25 and the stock A3640.

When I did the hack, I was using a CV64/3D.  The difference in p96speed was incredible for just an 8Mhz overclock.  The A3640 was a poorly designed upgrade.  It should have been at least 28Mhz to function properly with the motherboard.
I socketed my oscillator crystal by cutting pins off of an IC socket and soldering it to the board first as it suggests in the article.  That way I could try different speeds.  I have heard of people clocking the 3640 all the way up to 40Mhz.... although I was never brave enough to try.  I might have done it if I had run across a good deal on an 040 designed for 40Mhz.

Good luck...this is making me want to get an Amiga again!